October 4

The Space Age Begins

1957 — Sputnik 1 Becomes the World's First Artificial Satellite

19:28:34 UTC

On October 4, 1957, a rocket rose from a launch site in the Soviet republic of Kazakhstan carrying a polished metal sphere only 58 centimeters—about 23 inches—across. At 19:28:34 UTC, the Soviet Union launched Sputnik 1, the world's first artificial satellite. Humanity had entered the Space Age. Sputnik itself was remarkably simple. The pressurized aluminum sphere weighed approximately 83.6 kilograms, or 184 pounds. Four long antennas extended behind it, and two radio transmitters broadcast alternating signals at frequencies of approximately 20 and 40 megahertz. Those transmissions produced the feature for which Sputnik became famous: its repeated “beep-beep-beep” radio signal. The sound was technologically simple but historically extraordinary. For the first time, a human-made object was circling Earth and announcing its presence by radio. Sputnik entered an elliptical orbit and completed a circuit of Earth approximately every 96–98 minutes. Anyone with suitable radio equipment could listen. Professional tracking stations heard it. Amateur radio operators heard it. People around the world heard recordings broadcast over radio and television. The signal made something abstract suddenly tangible. Spaceflight was no longer a theoretical possibility. It was happening overhead. The satellite itself also contributed scientific information. The behavior of its radio signals helped researchers study the propagation of radio waves through Earth's ionosphere, while changes in Sputnik's orbit provided information about the density of the upper atmosphere. But Sputnik's greatest effects occurred on Earth. The Soviet Union had demonstrated not only that it could build a satellite but that it possessed a rocket powerful enough to place a substantial object into orbit. That had immediate military implications. A rocket capable of launching a satellite suggested technologies related to those required for an intercontinental ballistic missile. The achievement shocked the United States. American scientists and engineers had also been developing satellite programs for the International Geophysical Year, but none had yet reached orbit. Suddenly, the Soviet Union was first. The psychological impact became known as the “Sputnik crisis.” American political leaders, educators, scientists, and military officials began asking how the Soviet Union had achieved such an important technological first. The response affected education, research, defense, and government organization. Federal support increased for science, mathematics, engineering, and foreign-language education. The Advanced Research Projects Agency—later DARPA—was established in 1958. Most importantly for the history we have been following, Congress passed the National Aeronautics and Space Act, which President Dwight D. Eisenhower signed on July 29, 1958. On October 1, 1958—as we noted only three days ago in this chronology—NASA began operations. Sputnik therefore helped create the circumstances that produced the American civilian space agency. Meanwhile, the satellite continued circling Earth. Its batteries lasted about three weeks. After that, the famous radio signal stopped. But Sputnik itself remained in orbit. Atmospheric drag gradually lowered its trajectory until, on January 4, 1958, after approximately three months and some 1,400 orbits of Earth, Sputnik reentered the atmosphere and burned up. The spacecraft was gone. The age it began was not.

Why It Matters: Sputnik 1 was the first artificial satellite of Earth and is widely regarded as the beginning of the Space Age. Its launch demonstrated that orbital spaceflight was possible, transformed Cold War competition, accelerated investment in science and technology, helped spur the creation of NASA, and began the transition from looking at space to physically entering it.

 

Also on This Day

1959 — Luna 3 Begins Its Journey to the Far Side of the Moon

00:43:40 UTC

Exactly two years after Sputnik 1, the Soviet Union launched another spacecraft from Kazakhstan. Its destination was the Moon. At 00:43:40 UTC on October 4, 1959, Luna 3 began a mission that would reveal something no human being had ever seen: the far side of the Moon. The reason that hemisphere remained hidden was not that the Moon does not rotate. It does. But the Moon rotates once on its axis in approximately the same time it takes to orbit Earth. This synchronous rotation causes nearly the same lunar hemisphere always to face our planet. Small effects called libration allow observers on Earth to glimpse somewhat more than half the lunar surface over time. But a substantial portion remained permanently beyond terrestrial view. For all of human history, people had looked at the Moon without knowing what much of its opposite hemisphere looked like. Luna 3 was designed to change that. The spacecraft weighed approximately 278.5 kilograms and carried the Yenisey-2 photographic television system, along with instruments for studying radiation, charged particles, and micrometeoroids. Its trajectory carried it beyond the Moon and around the lunar far side. On October 6, Luna 3 passed the Moon's southern polar region. Then, on October 7, with the far side illuminated by sunlight, its camera began taking photographs. Over approximately 40 minutes, the spacecraft exposed 29 photographs, covering roughly 70 percent of the previously unseen hemisphere. That alone was an extraordinary achievement. But there was another problem. The photographs were inside a spacecraft hundreds of thousands of kilometers away. Digital imaging did not yet exist. Luna 3 used actual photographic film. The spacecraft therefore carried equipment that automatically developed the film aboard the spacecraft. The resulting images were then scanned electronically and transmitted toward Earth by radio, in a process somewhat analogous to sending a fax across interplanetary space. Seventeen usable images were eventually received. They were poor by modern standards—grainy, noisy, and lacking fine detail. But what they showed was astonishing. The lunar far side looked different from the familiar hemisphere facing Earth. The near side is dominated by broad dark plains called maria, created by ancient volcanic flows that filled enormous impact basins. The far side contained far fewer large maria and appeared more heavily cratered and mountainous. Among the features identified from Luna 3's photographs were Mare Moscoviense, the Sea of Moscow, and the feature initially called Mare Desiderii, the Sea of Dreams. Later spacecraft would photograph the far side in vastly greater detail.

But Luna 3 had done something more fundamental. It had turned an unknown hemisphere into a place humans could see and map. Why It Matters: Luna 3 provided humanity's first photographs of the Moon's far side, revealing that it differed dramatically from the familiar Earth-facing hemisphere. The mission demonstrated sophisticated deep-space navigation, automated photography, onboard film processing, and long-distance image transmission only two years after the beginning of the Space Age.

2004 — SpaceShipOne Wins the Ansari X Prize

Spacecraft release and powered flight began approximately 14:49 UTC

On October 4, 2004—47 years to the day after Sputnik 1—pilot Brian Binnie climbed aboard the small experimental spacecraft SpaceShipOne above California's Mojave Desert. The goal was not orbit. The goal was to demonstrate that a privately developed, reusable crewed spacecraft could reach space twice within two weeks. The challenge had been established by the Ansari X Prize, a $10 million competition intended to encourage development of private human spaceflight. To win, a privately financed vehicle had to reach an altitude of at least 100 kilometers, the internationally recognized Kármán-line boundary commonly used to define the beginning of space, while carrying the equivalent mass of three people. Then it had to do it again within two weeks using the same spacecraft. SpaceShipOne had already completed the first qualifying flight. On September 29, pilot Mike Melvill had flown it to an altitude of approximately 102 kilometers. Five days later came the second attempt. SpaceShipOne did not launch vertically from the ground. Instead, a carrier aircraft called White Knight carried it to an altitude of more than 13 kilometers. At approximately 14:49 UTC, SpaceShipOne separated. Binnie ignited its hybrid rocket motor and accelerated steeply upward. The spacecraft continued climbing after the engine shut down. It reached an altitude of approximately 112 kilometers—nearly 70 miles above Earth. That was comfortably beyond the 100-kilometer requirement. It also exceeded the altitude record for a winged rocket-powered aircraft established by the X-15 four decades earlier. During reentry, SpaceShipOne employed one of its most distinctive innovations. The rear portion of its wings rotated upward into a high-drag “feathered” configuration. Rather than requiring the pilot to maintain a precisely controlled attitude throughout the most difficult portion of reentry, the feathered configuration helped the spacecraft align itself aerodynamically. Once it descended into denser atmosphere, the wings returned to their normal position. SpaceShipOne became a glider. Binnie landed safely back at Mojave. The two qualifying flights had occurred only five days apart. The team had won the $10 million Ansari X Prize. SpaceShipOne did not enter orbit, and it did not immediately produce routine passenger travel into space. Its historical significance was more specific. A privately developed reusable spacecraft had demonstrated repeated crewed suborbital spaceflight without being operated as a government space program. The Smithsonian later placed SpaceShipOne in the National Air and Space Museum alongside such milestones as the Wright Flyer, Charles Lindbergh's Spirit of St. Louis, John Glenn's Friendship 7, and the Bell X-1.

Why It Matters: SpaceShipOne's October 4 flight completed the requirements for the Ansari X Prize and demonstrated that a privately developed reusable crewed spacecraft could make repeated trips beyond the 100-kilometer boundary of space. It became an important milestone in the emergence of commercial human spaceflight.

 

The Bigger Picture

Few dates illustrate the transformation of spaceflight as clearly as October 4. In 1957, Sputnik 1 demonstrated that humanity could place an object into orbit. In 1959, Luna 3 demonstrated that a spacecraft could travel hundreds of thousands of kilometers from Earth, pass behind another world, photograph territory no human had ever seen, process those photographs automatically, and send them home. In 2004, SpaceShipOne demonstrated something different: human spaceflight was beginning to extend beyond the exclusive operation of national governments. The progression is remarkable. Reach space → orbit Earth → explore another world → broaden who can build and operate spacecraft. There is also a striking contrast between Sputnik 1 and Luna 3. Only two years separated them. Sputnik was a radio transmitter inside a metal sphere. Luna 3 was a deep-space robotic observatory equipped to navigate around the Moon, orient itself, photograph an unseen landscape, chemically develop film automatically, scan the results, and transmit the pictures across hundreds of thousands of kilometers. That rapid progression reminds us how quickly the early Space Age developed. The first satellite did not lead to decades of cautious experimentation before humanity ventured farther. Within a year, spacecraft were being aimed toward the Moon. Within two years, one had reached the lunar surface and another had traveled behind it. Within four years, a human being would orbit Earth. And within twelve years of Sputnik, people would walk on the Moon. October 4 also reminds us that anniversaries can influence history. Luna 3 was launched on the second anniversary of Sputnik. SpaceShipOne's prize-winning flight occurred on the 47th anniversary. The United Nations later designated October 4–10 as World Space Week, beginning with the anniversary of Sputnik and ending with the anniversary of the 1967 Outer Space Treaty entering into force. The date therefore became more than the anniversary of one satellite. It became a marker for humanity's entrance into a new realm. Before October 4, 1957, every object ever made by human hands remained on Earth—or returned quickly to it. After that night, there was something else overhead: an object built on Earth, traveling around the world on its own celestial path. The sky had ceased to be only something humanity observed. It had become somewhere humanity could go.

At a Glance

1957 — 19:28:34 UTC — The Soviet Union launches Sputnik 1, the world's first artificial satellite, beginning the Space Age.

1959 — 00:43:40 UTC — Luna 3 launches toward the Moon; three days later it will obtain humanity's first photographs of the lunar far side.

2004 — Approximately 14:49 UTC — Brian Binnie begins SpaceShipOne's second qualifying X Prize spaceflight, reaching approximately 112 kilometers and securing the Ansari X Prize for repeated privately developed crewed suborbital spaceflight.

October 3

The Rocket That Changed the Future

1942 — The A-4 Rocket Makes Its First Successful Flight

Launch time not established

On October 3, 1942, a rocket rose from the German Army research center at Peenemünde on the Baltic coast. Known during development as the A-4, it would later become infamous under another name: V-2. The test vehicle climbed to an altitude of roughly 85–90 kilometers and traveled approximately 190 kilometers before falling back to Earth. It was the first successful flight of a machine unlike anything that had preceded it. The A-4 was a large, long-range, liquid-fueled ballistic rocket. Its engine burned alcohol and liquid oxygen and produced approximately 25 metric tons of thrust. An advanced guidance system controlled the vehicle during powered flight. Previous experimental rockets had demonstrated many of the principles involved. The American physicist Robert Goddard had successfully flown the world's first liquid-fueled rocket in 1926 and subsequently developed increasingly sophisticated rockets incorporating gyroscopic stabilization, pumps, and other technologies. German experimenters had also pursued liquid-fueled rocketry during the 1920s and 1930s. But the A-4 represented a dramatic increase in scale. The October 3 flight demonstrated that a large liquid-fueled rocket could climb to extreme altitude, follow a guided ballistic trajectory, and travel hundreds of kilometers. In purely technological terms, it was a milestone on the road toward spaceflight. But it was not built to explore space. It was built to carry an explosive warhead. Germany was at war, and the A-4 became the V-2, short for Vergeltungswaffe 2—“Vengeance Weapon 2.” Beginning in 1944, V-2 missiles were launched against London, Antwerp, and other targets. Unlike aircraft or earlier weapons, the V-2 descended toward its target at supersonic speed. No warning system could provide meaningful time to intercept it. Thousands of civilians and military personnel were killed or injured by V-2 attacks. Yet even that terrible toll does not encompass the weapon's human cost. Mass production was centered at the underground Mittelwerk factory, where prisoners from the Mittelbau-Dora concentration-camp system were subjected to forced labor under appalling conditions. Thousands died from starvation, disease, exhaustion, beatings, executions, and other abuse. More people died producing the V-2 than were killed by its operational use as a weapon. That history is inseparable from the rocket. After Germany's defeat in 1945, both the United States and Soviet Union sought German rocket hardware, documents, and specialists. The United States brought Wernher von Braun and more than one hundred other German rocket specialists to America through the program eventually known as Operation Paperclip. Captured V-2 rockets were transported to the United States and launched from White Sands, New Mexico, carrying scientific instruments into the upper atmosphere. The Soviet Union similarly obtained German hardware, facilities, documentation, and specialists. Soviet engineers studied and reproduced the technology before developing increasingly capable rockets of their own. The descendants of those programs eventually moved beyond weapons. In the United States, von Braun's team helped develop the Redstone, Jupiter, and Saturn rockets. The Saturn V carried astronauts to the Moon. In the Soviet Union, engineers under Sergei Korolev developed a different technological lineage culminating in the R-7, the rocket family that launched Sputnik and Yuri Gagarin and whose descendants continue to fly. The October 3, 1942, flight therefore occupies an uncomfortable but unavoidable place in space history. The rocket demonstrated technologies that would eventually help humanity reach beyond Earth. But it was created for war, under a dictatorship responsible for enormous crimes, and its later production depended upon murderous exploitation. Both truths belong in the story.

Why It Matters: The successful A-4 flight demonstrated technologies fundamental to later large liquid-fueled rockets and strongly influenced postwar rocket development in both the United States and Soviet Union. But its significance cannot be separated from its origin as a Nazi weapon and from the concentration-camp prisoners who suffered and died producing it. The history of spaceflight contains extraordinary achievements, but understanding that history also requires remembering the human costs embedded within some of its technological foundations.

 

Also on This Day

1962 — Wally Schirra Flies Sigma 7 Six Times Around Earth

Launch: 12:15:12 UTC

On October 3, 1962, astronaut Walter “Wally” Schirra climbed into the small Mercury spacecraft he had named Sigma 7. The name reflected the kind of mission he intended to fly. The Greek letter sigma is used in mathematics to represent summation. For Schirra, Sigma 7 represented the sum of the engineering work that had gone into Mercury—and the seven astronauts originally chosen for the program. At 12:15:12 UTC, an Atlas rocket lifted Sigma 7 from Cape Canaveral. Schirra became the fifth American in space and the third American to orbit Earth. John Glenn and Scott Carpenter had each completed three orbits earlier that year. Schirra would attempt six. The mission, officially designated Mercury-Atlas 8, emphasized engineering and spacecraft operations. One of its most important questions concerned resources. Mercury carried limited electrical power and maneuvering fuel. If future missions were to remain in space longer, astronauts would have to demonstrate that those resources could be conserved. Schirra deliberately allowed Sigma 7 to drift for extended periods rather than continuously controlling its attitude. The technique greatly reduced fuel consumption. He also conducted spacecraft tests, photographed Earth, made visual observations, and experimented with using stars for orientation. At one point Schirra transmitted a television message from orbit, one of the early live broadcasts from an American spacecraft. After six circuits of Earth, he prepared for reentry. His landing demonstrated another aspect of the mission's precision. Sigma 7 splashed down in the Pacific after 9 hours, 13 minutes, and 11 seconds in flight. The spacecraft landed only a few miles from the recovery carrier USS Kearsarge. It was the first crewed American orbital mission to end with a Pacific Ocean splashdown. Schirra later described Sigma 7 as a “textbook flight.” The characterization was appropriate. Mercury was becoming less about proving that an American could survive orbit and more about demonstrating that people and spacecraft could operate there predictably and efficiently. Schirra would later become the only astronaut to fly in all three of America's pioneering human-spaceflight programs: Mercury, Gemini, and Apollo.

Why It Matters: Sigma 7 demonstrated disciplined spacecraft operation, fuel conservation, and precise reentry during America's longest orbital mission to that point. Mercury was evolving from an experiment in human survival into the foundation for the more complex operations required by Gemini and Apollo.

1985 — Atlantis Makes Its First Flight

15:15:30 UTC

On October 3, 1985, another spacecraft began a much longer career. At 15:15:30 UTC, Space Shuttle Atlantis lifted off from Kennedy Space Center on mission STS-51J. It was Atlantis's first journey into space. Atlantis was the fourth operational orbiter constructed for NASA's Space Shuttle fleet, following Columbia, Challenger, and Discovery. Its first mission was unusual because much of what it carried and accomplished was classified. STS-51J was a dedicated mission for the United States Department of Defense. Commander Karol Bobko led a five-person crew consisting of pilot Ronald Grabe and mission specialists David Hilmers, Robert Stewart, and William Pailes. The mission's primary payload involved military communications satellites. Because of the classified nature of the flight, NASA's normal public coverage stopped shortly after Atlantis reached orbit. After four days in space, Atlantis landed at Edwards Air Force Base in California on October 7. Its first mission was complete. But the orbiter's career was only beginning. Atlantis would eventually become one of the most important vehicles in the Shuttle fleet. It launched the Magellan spacecraft toward Venus in 1989. Later that year, it launched Galileo toward Jupiter. In 1991, Atlantis carried the Compton Gamma Ray Observatory, one of NASA's Great Observatories, into orbit. During the 1990s, Atlantis became closely associated with the Shuttle-Mir program, completing multiple dockings with the Russian space station and helping build experience in international long-duration operations. It later played a major role in assembling and servicing the International Space Station. And on July 8, 2011, Atlantis lifted off on STS-135, the final mission of the entire Space Shuttle program. The spacecraft that began its career with a classified military mission on October 3, 1985, therefore ended it almost 26 years later by closing one of the most recognizable chapters in the history of human spaceflight.

Why It Matters: STS-51J began the 33-mission career of Space Shuttle Atlantis. Over the following quarter century, the orbiter would launch major planetary and astronomical spacecraft, help pioneer cooperation with Mir, support construction of the International Space Station, and ultimately fly the final mission of the Space Shuttle era.

 

The Bigger Picture

October 3 offers an unusually concentrated view of the evolution of the rocket. In 1942, the A-4 demonstrated that a large liquid-fueled rocket could travel to extraordinary altitude and range. Twenty years later, an Atlas rocket carried Wally Schirra into orbit. Twenty-three years after that, Atlantis climbed toward space using a combination of reusable liquid-fueled engines and enormous solid rocket boosters. Technologically, it is tempting to draw a simple line: A-4 → ballistic missiles → launch vehicles → human spaceflight → reusable spacecraft. There is truth in that progression. But it is incomplete. Technology does not carry its own moral purpose. A rocket engine can accelerate a warhead toward a city. A related technology can carry a scientific instrument above Earth's atmosphere. Another can place a human being into orbit. Still another can launch a probe toward Jupiter. The physical laws are the same. The purposes are not. That distinction is particularly important on October 3. The people who suffered and died in the V-2 program should not disappear from the history simply because technologies developed there later contributed to space exploration. Nor should the history imply that modern spaceflight emerged from one nation or one group alone. Robert Goddard's pioneering experiments in the United States, Konstantin Tsiolkovsky's theoretical work in Russia, Hermann Oberth's writings and experiments in Europe, Soviet engineering under Sergei Korolev, American research, and contributions from thousands of engineers and scientists across many countries all belong to the much larger story. By the time Schirra flew Sigma 7, the rocket had become a means of placing a human being into orbit. By the time Atlantis flew, rockets had become part of a transportation system capable of carrying people, satellites, observatories, and planetary spacecraft. October 3 therefore gives us something more complicated than a story of technological progress. It asks us to remember that the history of exploration contains both achievement and responsibility. Understanding how we reached space means remembering both.

At a Glance

1942 — Launch time not established — The A-4 makes its first successful test flight from Peenemünde, demonstrating large-scale liquid-fueled ballistic-rocket technology that will strongly influence postwar missile and space-launch development.

1962 — 12:15:12 UTC — Wally Schirra launches aboard Sigma 7 on Mercury-Atlas 8, completing six Earth orbits during a 9-hour, 13-minute engineering mission.

1985 — 15:15:30 UTC — Space Shuttle Atlantis launches on STS-51J for its maiden flight, beginning a 33-mission career that will continue through the final Space Shuttle mission in 2011.

October 2

 The Mathematics of Reaching Other Worlds

1920 — Giuseppe “Bepi” Colombo Is Born

Time unknown

On October 2, 1920, Giuseppe “Bepi” Colombo was born in Padua, Italy. He would become a mathematician and engineer whose insights helped change the way spacecraft travel through the solar system. Colombo studied mathematics at the University of Pisa, graduating in 1944, and later became a professor at the University of Padua. His interests ranged across celestial mechanics, planetary science, spacecraft trajectories, orbital dynamics, and the behavior of artificial satellites. But his name became particularly associated with Mercury. For many years, astronomers believed that Mercury kept essentially the same face toward the Sun, much as the Moon keeps the same face toward Earth. Radar observations in the 1960s demonstrated otherwise. Mercury rotates once approximately every 59 Earth days, while taking about 88 days to orbit the Sun. At first, that relationship seemed peculiar. Colombo recognized its significance. Mercury was locked into a 3:2 spin-orbit resonance: for every two journeys it makes around the Sun, the planet rotates exactly three times. That realization helped explain one of the solar system's more unusual examples of orbital and rotational dynamics. Colombo's most influential contribution to spaceflight emerged as NASA prepared Mariner 10, the first spacecraft intended to visit Mercury. Getting to Mercury is surprisingly difficult. A spacecraft launched from Earth already shares Earth's enormous orbital velocity around the Sun. To reach Mercury, it must lose substantial orbital energy and fall inward toward the Sun without simply racing past its target. Mariner 10's planned trajectory included a flyby of Venus. Colombo recognized something remarkable about the spacecraft's subsequent orbit. If engineers carefully selected the geometry of Mariner 10's encounter with Mercury, the planet's gravity could reshape the spacecraft's orbit around the Sun so that Mariner 10 would return to Mercury again. NASA's Jet Propulsion Laboratory studied the proposal and confirmed it. The idea worked. Mariner 10 flew past Venus in February 1974, using the planet's gravity to alter its trajectory. It encountered Mercury for the first time on March 29, 1974. Then it came back. Mariner 10 flew past Mercury again in September 1974 and a third time in March 1975. Instead of one encounter, scientists received three. The spacecraft photographed a cratered surface that in some respects resembled the Moon, discovered that Mercury possessed an unexpected intrinsic magnetic field, and greatly improved knowledge of the innermost planet. The trajectory represented an important development in the use of gravity assists. The principle is elegant. A spacecraft approaching a moving planet enters the planet's gravitational influence. As the spacecraft swings past, gravity bends its trajectory. Viewed relative to the Sun, the encounter can transfer orbital energy between the planet and spacecraft, changing the spacecraft's speed and direction without requiring the equivalent amount of rocket propellant. The change to the planet's motion is immeasurably small. For the spacecraft, it can be transformative. Gravity assists became one of the essential tools of interplanetary exploration. The Voyagers used planetary encounters to travel through the outer solar system. Galileo used gravity assists at Venus and Earth to reach Jupiter. Cassini used Venus, Earth, and Jupiter on its journey to Saturn. MESSENGER used repeated encounters with Earth, Venus, and Mercury before entering Mercury orbit. The European-Japanese BepiColombo mission takes the concept even farther, combining solar-electric propulsion with multiple planetary flybys to gradually remove enough orbital energy to enter orbit around Mercury. Colombo contributed to other areas as well. He developed ideas involving long orbital tethers and helped inspire ESA's mission to Halley's Comet, suggesting that it be named Giotto after the medieval Italian artist who depicted the Star of Bethlehem in a manner possibly inspired by a comet. Colombo died in 1984, before Giotto encountered Halley's Comet in 1986. His influence continued. In 1999, the European Space Agency named its ambitious Mercury mission BepiColombo in his honor. The joint ESA-JAXA mission would employ precisely the sort of sophisticated orbital mechanics with which Colombo's name had become associated. Why It Matters: Giuseppe Colombo demonstrated how mathematical insight could dramatically expand what a spacecraft could accomplish. His work helped Mariner 10 turn one planned encounter with Mercury into three and contributed to the development of gravity-assist techniques that became fundamental to planetary exploration. His career illustrates a crucial truth about spaceflight: reaching another world depends as much upon understanding celestial mechanics as upon building powerful rockets.

 

Also on This Day

1962 — Explorer 14 Launches to Investigate Earth's Space Environment

Launch time not established

On October 2, 1962, NASA launched Explorer 14, also known during development as S-3a, aboard a Thor-Delta rocket from Cape Canaveral. The spacecraft was designed to investigate an environment that scientists had only recently discovered was far more complicated than expected. Before the Space Age, the region surrounding Earth was sometimes imagined as comparatively empty. The first Explorer satellites changed that picture. Measurements beginning with Explorer 1 in 1958 revealed intense populations of energetic charged particles trapped by Earth's magnetic field—the Van Allen radiation belts. Explorer 14 continued the investigation. Its scientific instruments included detectors for cosmic rays, solar particles, trapped radiation, ions, plasma, and magnetic fields. Its highly elliptical orbit carried it from a few hundred kilometers above Earth to roughly 100,000 kilometers away, allowing instruments to sample very different regions of Earth's magnetic environment. The mission was especially timely. The Sun was capable of releasing streams and eruptions of energetic particles into interplanetary space. When those particles encountered Earth's magnetic field, they could dramatically change conditions around the planet. Understanding that environment was important scientifically, but it also had practical consequences. Astronauts and spacecraft electronics could be exposed to radiation. Radio communications could be disrupted. Satellites would have to operate within an environment shaped simultaneously by Earth and the Sun. Explorer 14 returned roughly 6,500 hours of scientific data during about ten months of useful operation. Among its contributions were observations helping scientists understand the shape of Earth's magnetosphere and the behavior of charged particles within it. The scientific field would eventually become central to what we now call space weather.

Why It Matters: Explorer 14 helped reveal that the space surrounding Earth is not empty but a dynamic environment filled with charged particles and shaped by Earth's magnetic field and the Sun. Understanding that environment became essential both to heliophysics and to the safe operation of spacecraft.

1991 — Soyuz TM-13 Launches an International Crew Toward Mir

Launch time not established

On October 2, 1991, Soyuz TM-13 launched from the Baikonur Cosmodrome carrying a crew that reflected the rapidly changing political geography of Europe and the Soviet Union. Commander Aleksandr Volkov was accompanied by Toktar Aubakirov of Kazakhstan and Franz Viehböck of Austria. Aubakirov became the first Kazakh in space. Viehböck became the first Austrian in space. Their destination was the Soviet space station Mir. The flight occurred at an extraordinary historical moment. Only weeks earlier, an attempted coup against Soviet leader Mikhail Gorbachev had failed. Several Soviet republics were moving rapidly toward independence. The Soviet Union itself had only months left to exist. Aubakirov's presence was therefore especially symbolic. He had been born in the Kazakh Soviet Socialist Republic, while the Baikonur launch complex from which he departed was located on Kazakh territory. Viehböck's mission, meanwhile, grew from Austrian-Soviet scientific cooperation. During his time aboard Mir, he conducted experiments involving medicine, physics, materials, and other fields. Aubakirov and Viehböck remained aboard Mir only briefly before returning to Earth with cosmonaut Anatoly Artsebarsky. Volkov stayed. He joined Sergei Krikalev, who had already been living aboard Mir since May. Then history overtook the mission. In December 1991, the Soviet Union ceased to exist. Volkov and Krikalev had launched under one political system and would return in March 1992 to a transformed world. Baikonur itself was now located in the independent nation of Kazakhstan. The spacecraft continued orbiting Earth while borders, governments, and national identities changed beneath it.

Why It Matters: Soyuz TM-13 expanded human spaceflight to Kazakhstan and Austria while also becoming part of one of the most remarkable political transitions ever experienced during a space mission. Mir continued operating even as the Soviet state that had created it disappeared, demonstrating how spaceflight institutions and international partnerships could survive profound changes on Earth.

 

The Bigger Picture

October 2 reminds us that exploration depends upon learning how to navigate environments that cannot be controlled. For Bepi Colombo, that environment was the gravitational architecture of the solar system. Planets are not simply destinations. They are moving masses whose gravity can become part of the spacecraft itself—a kind of invisible propulsion system available to anyone who can calculate the trajectory precisely enough. Explorer 14 confronted another invisible environment. Earth appears to orbit through empty space, but the planet is actually surrounded by magnetic fields and energetic particles interacting continuously with the Sun. Spacecraft entering that environment must understand it rather than ignore it. And Soyuz TM-13 encountered an environment of another kind. While its crew traveled to Mir, the political world beneath them was changing dramatically. The Soviet Union that launched the mission would soon disappear, yet the station remained in orbit and its crews continued working. There is an intriguing common thread: exploration succeeds by adapting to forces larger than the spacecraft itself. Gravity cannot be switched off. The solar wind cannot be stopped. History on Earth does not pause because people are living in orbit. The explorer therefore learns the environment and works within it. Colombo's great insight made this especially clear. Early thinking about interplanetary flight could easily emphasize rocket power: if another world is difficult to reach, build a more powerful rocket and carry more fuel. Celestial mechanics offers a subtler answer. Sometimes the solar system itself can help. A planet's gravity can accelerate a spacecraft, slow it, redirect it, or arrange another encounter years later. The planets become not merely destinations on the journey. They become part of the road.

At a Glance

1920 — Time unknown — Giuseppe “Bepi” Colombo is born in Padua, Italy; his later work on Mercury and spacecraft trajectories helps establish gravity-assist techniques as an essential tool of planetary exploration.

1962 — Launch time not established — NASA launches Explorer 14 to investigate energetic particles, plasma, cosmic radiation, and Earth's magnetosphere.

1991 — Launch time not established — Soyuz TM-13 launches Aleksandr Volkov, Toktar Aubakirov, and Franz Viehböck toward Mir; Aubakirov and Viehböck become the first people from Kazakhstan and Austria, respectively, to travel in space.

October 1

NASA Opens for Business

1958 — The National Aeronautics and Space Administration Begins Operations

Time not applicable

On October 1, 1958, a new agency of the United States government officially began operations. Its name was the National Aeronautics and Space Administration—NASA. The agency had been created only two months earlier, when President Dwight D. Eisenhower signed the National Aeronautics and Space Act into law on July 29. But October 1 was the day NASA actually opened for business. Its creation had been accelerated by events unfolding high above Earth. On October 4, 1957, the Soviet Union launched Sputnik 1, the world's first artificial satellite. A month later came Sputnik 2, carrying the dog Laika. The United States was suddenly confronted with unmistakable evidence that the Soviet Union possessed powerful rocket technology and had taken the lead in the emerging exploration of space. The American response was not simply to build another rocket. The United States needed an organization capable of coordinating a long-term civilian program of aeronautical and space research. There was already an institution from which to build one. The National Advisory Committee for Aeronautics, or NACA, had been established in 1915. For more than four decades, its engineers and scientists had conducted research that profoundly influenced aircraft design, aerodynamics, propulsion, and high-speed flight. NASA did not replace that expertise so much as inherit and expand it. On September 30, thousands of people left work as NACA employees. On October 1, they returned as NASA employees. Approximately 8,000 NACA personnel formed the core of the new agency. NASA initially inherited three major NACA laboratories—Langley in Virginia, Ames in California, and Lewis in Ohio—along with smaller facilities at Wallops Island, Virginia, and the high-speed flight station at Edwards Air Force Base in California. NASA's first administrator was T. Keith Glennan, formerly president of the Case Institute of Technology. NACA director Hugh L. Dryden, one of America's most respected aeronautical scientists, became NASA's first deputy administrator. The agency's initial headquarters occupied temporary quarters in the Dolley Madison House on Lafayette Square in Washington, D.C. There, on October 1, Glennan addressed a headquarters staff of approximately 170 people. The organization was small compared with the NASA that would emerge during the following decade. But it did not remain small for long. NASA soon absorbed or acquired responsibility for programs and organizations already engaged in space-related work. These included space-science activities associated with the Naval Research Laboratory, the Jet Propulsion Laboratory in California, and eventually the Army rocket-development organization in Huntsville led by Wernher von Braun. Almost immediately, the new agency confronted the question of human spaceflight. On NASA's first day of operation, Robert Gilruth briefed Glennan about plans for sending a person into space. NASA's historical account records that within two hours of hearing the presentation, Glennan told Gilruth to proceed. The effort soon developed into the Space Task Group and Project Mercury. Only ten days after NASA began operations, Pioneer 1 became the first spacecraft launched under the new agency's auspices. Although a launch-vehicle malfunction prevented it from reaching its intended lunar orbit, Pioneer 1 traveled approximately 70,000 miles from Earth and returned useful scientific measurements. The pace accelerated rapidly. Within less than three years, Alan Shepard became the first American in space. In 1962, John Glenn became the first American to orbit Earth. Gemini followed, developing rendezvous, docking, spacewalking, and long-duration flight techniques. Then came Apollo. On July 20, 1969—less than eleven years after NASA opened its doors—Neil Armstrong and Buzz Aldrin landed on the Moon. NASA's work would eventually extend much farther: robotic spacecraft to every planet of the solar system, astronomical observatories above Earth's atmosphere, reusable Space Shuttles, Mars rovers, international space stations, planetary-defense experiments, and telescopes capable of examining galaxies whose light began its journey billions of years ago. Yet NASA's mandate was never limited to space. The word Aeronautics came first in its name for a reason. The agency continued the NACA tradition of research into aircraft, propulsion, aerodynamics, materials, flight safety, and eventually supersonic, hypersonic, electric, and increasingly efficient aviation. The organization that opened its doors on October 1, 1958, therefore joined two frontiers: flight within Earth's atmosphere and flight beyond it.

Why It Matters: NASA's opening created a permanent civilian institution for American aeronautical research and space exploration. Built upon more than four decades of NACA expertise, the agency became one of the principal organizations through which humanity explored the Moon, planets, Sun, Earth, and universe. October 1 marks not the passage of the law that created NASA, but the day the agency itself began its work.

 

Also on This Day

1990 — The First Hubble Science Paper Is Submitted

Time not applicable

On October 1, 1990, astronomer Tod Lauer of the National Optical Astronomy Observatory submitted the first scientific paper based upon observations made by the newly launched Hubble Space Telescope. The paper concerned the core of the galaxy NGC 7457 and observations made with Hubble's Planetary Camera. The milestone came during a difficult period for Hubble. The telescope had been launched aboard Space Shuttle Discovery on April 24, 1990, amid enormous expectations. An observatory above Earth's atmosphere could avoid the blurring effects produced as starlight passed through turbulent air. Astronomers anticipated exceptionally sharp images and observations at wavelengths difficult or impossible to study from the ground. Then scientists discovered that Hubble's 2.4-meter primary mirror had been manufactured to the wrong shape. The error was extraordinarily small in ordinary terms—roughly one-fiftieth the thickness of a human hair at the mirror's edge—but enormous for a precision astronomical instrument. Hubble suffered from spherical aberration. Its images were not as sharp as intended. The problem became one of NASA's most publicized technical embarrassments. But Hubble was not useless. Astronomers learned how to characterize the optical error, and several instruments could still perform valuable observations. Image-processing techniques also recovered substantial scientific information. The October 1 paper demonstrated an important point: the flawed telescope could still do science. The paper examined the central region of NGC 7457, a lenticular galaxy tens of millions of light-years away, as astronomers investigated the structure of its nucleus and the possibility of a massive compact object there. Hubble's story would change dramatically three years later. In December 1993, astronauts aboard Space Shuttle Endeavour conducted the first Hubble servicing mission. They installed corrective optics and a new camera designed to compensate for the primary mirror's error. The results were spectacular. Hubble became one of the most scientifically productive astronomical instruments ever constructed. But its scientific career had already begun before the repair. Why It Matters: Submission of Hubble's first scientific paper showed that even the telescope's serious optical flaw could not prevent useful astronomy. The milestone also began a scientific literature that would eventually encompass discoveries involving planets, stars, galaxies, black holes, the expansion of the universe, and some of the most distant objects ever observed.

2005 — Soyuz TMA-7 Launches Expedition 12 and Gregory Olsen

03:54:53 UTC

On October 1, 2005, a Soyuz-FG rocket lifted off from the Baikonur Cosmodrome carrying Soyuz TMA-7 toward the International Space Station. Aboard were Russian cosmonaut Valery Tokarev, NASA astronaut William McArthur, and American scientist and entrepreneur Gregory Olsen. Tokarev and McArthur were beginning a long-duration stay as the principal crew of Expedition 12. Olsen was making a very different kind of journey. He became the third privately funded spaceflight participant to travel to the International Space Station, following Dennis Tito in 2001 and Mark Shuttleworth in 2002. NASA's history identifies Olsen as the third such participant. Olsen was not simply a wealthy passenger with an interest in space. He held advanced scientific degrees and had founded companies specializing in infrared and optical technologies. During his time aboard the station, he conducted experiments for the European Space Agency, participated in educational communications with students, and photographed Earth. Soyuz TMA-7 docked with the International Space Station on October 3. McArthur and Tokarev remained in orbit for approximately six months. Olsen stayed aboard the station for about eight days before returning to Earth with the departing Expedition 11 crew aboard Soyuz TMA-6. His flight belonged to a small but historically significant development. For most of the Space Age, people traveled into orbit almost exclusively as representatives of governments. Privately funded participants suggested that another category was possible. The numbers remained tiny, the costs enormous, and access extremely limited. But the idea that a private citizen could purchase transportation to orbit foreshadowed a much larger commercial human-spaceflight industry that would begin developing during the following decades.

Why It Matters: Soyuz TMA-7 continued the permanent international occupation of the ISS while Gregory Olsen's flight represented the gradual emergence of privately funded human spaceflight. The mission illustrates how an orbital station built by governments also became an early destination for people traveling under commercial arrangements.

 

The Bigger Picture

October begins with an institution. That may seem less dramatic than a rocket launch, planetary discovery, or Moon landing. Yet institutions are part of how exploration becomes possible. NASA did not invent American aeronautics on October 1, 1958. It inherited decades of expertise from NACA. It did not invent rocketry. It did not create astronomy. And it did not begin the Space Age—the Soviet Union had done that with Sputnik almost exactly one year earlier. What NASA provided was a durable organizational framework within which thousands of scientists, engineers, technicians, astronauts, mathematicians, physicians, administrators, universities, contractors, and international partners could pursue increasingly ambitious goals. The other events of October 1 illustrate how that framework evolved. In 1990, the newly launched Hubble Space Telescope was already beginning to produce scientific research despite a serious flaw. Hubble would eventually demonstrate another important characteristic of large scientific institutions: the ability to recognize a mistake, devise a solution, and recover. And Soyuz TMA-7 shows a world that had changed enormously since 1958. An American astronaut and Russian cosmonaut launched together toward an international laboratory permanently occupied by people from nations that had once competed bitterly for dominance in space. Beside them sat a privately funded participant. The progression is striking: create a national civilian space agency → build observatories beyond the atmosphere → construct an international laboratory in orbit → begin opening that environment to people traveling through commercial arrangements.

There is another reason October 1 deserves special attention. NASA was created in the geopolitical pressure of the Cold War, but the National Aeronautics and Space Act gave the new agency a broader purpose. It called for the expansion of human knowledge, preservation of the United States' role in aeronautical and space science and technology, cooperation with other nations, and the peaceful application of space activities. The history that followed did not always unfold neatly according to those aspirations. But on October 1, 1958, something enduring began. A few thousand people arrived at work under a new name. Within eleven years, members of their organization would help place human footprints on the Moon.

At a Glance

1958 — Time not applicable — NASA officially begins operations, absorbing the National Advisory Committee for Aeronautics as the core of the new American civilian space agency.

1990 — Time not applicable — Tod Lauer submits the first scientific paper based on Hubble Space Telescope observations, examining the nucleus of galaxy NGC 7457.

2005 — 03:54:53 UTC — Soyuz TMA-7 launches Valery Tokarev, William McArthur, and Gregory Olsen toward the International Space Station; Olsen becomes the third privately funded spaceflight participant to visit the station.

September 30

Rosetta Comes to Rest on a Comet

2016 — Rosetta Ends Its Mission on Comet 67P

Approximately 10:39 UTC — spacecraft event time

On September 30, 2016, the European Space Agency's Rosetta spacecraft completed one of the most ambitious journeys in the history of robotic exploration. It did not return to Earth. Instead, after more than twelve years in space and more than two years accompanying a comet around the Sun, Rosetta descended slowly toward the surface of Comet 67P/Churyumov–Gerasimenko. The spacecraft continued observing almost until the moment it touched the comet. Rosetta had launched from Kourou, French Guiana, on March 2, 2004. Its destination could not be reached directly with the available launch vehicle, so the spacecraft followed an extraordinary path through the inner solar system. It flew past Earth three times and Mars once, using the planets' gravity to reshape its orbit and gradually acquire the trajectory needed to meet its comet. Along the way, Rosetta also flew past asteroids 2867 Šteins and 21 Lutetia. Then, in June 2011, far from the Sun, the spacecraft entered deep-space hibernation. For 31 months, most of its systems remained shut down while Rosetta traveled through the cold outer portion of its orbit. On January 20, 2014, an onboard alarm clock awakened it. Seven months later, Rosetta reached Comet 67P. The comet proved astonishing. Its nucleus consisted of two distinct lobes joined by a narrow neck, giving it an appearance sometimes compared with a rubber duck. Its dark surface contained cliffs, pits, boulders, fractures, smooth plains, and deposits shaped by the comet's repeated passages near the Sun. Rosetta became the first spacecraft to rendezvous with a comet and accompany it as it traveled around the Sun. Rather than obtaining only the brief snapshot possible during a high-speed flyby, Rosetta watched 67P change. As the comet approached the Sun, sunlight warmed its icy nucleus. Gases escaped, carrying dust into space and creating the coma and tails characteristic of an active comet. Rosetta was there to watch the transformation. In November 2014, the mission achieved another historic first when the small Philae lander separated from Rosetta and descended toward the nucleus. Philae reached the surface but its anchoring systems failed to secure it. The lander bounced several times before coming to rest in a poorly illuminated location. Despite the difficult landing, Philae returned valuable scientific measurements before exhausting its primary battery. Rosetta continued its own observations. Its instruments investigated the comet's dust, gases, plasma environment, surface composition, structure, and interaction with the solar wind. Among the mission's most important questions was whether comets like 67P could have delivered a significant portion of Earth's water. Rosetta measured the ratio of deuterium to ordinary hydrogen in the comet's water and found it substantially different from Earth's ocean water. The result suggested that comets of 67P's type were probably not the dominant source of Earth's oceans. By 2016, however, the comet was moving outward from the Sun again. Solar energy reaching Rosetta's enormous solar panels was declining. Maintaining the spacecraft and communicating with it would become increasingly difficult. Mission planners chose a scientifically productive ending. Rosetta would descend to the comet. On September 29 at 20:50 UTC, the spacecraft performed its final maneuver from an altitude of approximately 19 kilometers and began a slow, controlled fall toward the nucleus. There would be no braking burn. Rosetta spent its final hours doing science. Its instruments measured gas, dust, plasma, temperature, and other properties increasingly close to the surface. Its cameras returned images at resolutions impossible from the spacecraft's normal operating distances. The target was in the Ma'at region on the comet's smaller lobe, near pits associated with cometary activity. ESA's reconstruction places Rosetta's arrival on the surface at approximately 10:39 UTC. The spacecraft came to rest only about 33 meters from its intended target point. The moment Rosetta contacted the surface, its systems automatically shut down. But Earth did not know immediately. Comet 67P was then approximately 720 million kilometers from Earth. Radio waves traveling at the speed of light required about 40 minutes to cross that distance. At ESA's European Space Operations Centre in Darmstadt, Germany, controllers watched Rosetta's signal. At 11:19:37 UTC, it disappeared. Rosetta's journey was over.

Why It Matters: Rosetta transformed the study of comets from brief encounters into sustained exploration. It became the first spacecraft to rendezvous with and accompany a comet around the Sun, delivered the first lander to a cometary nucleus, and observed 67P as increasing solar warmth transformed an inactive icy body into an active comet. Its final descent extended that science almost to the moment the spacecraft touched the world it had spent more than two years studying.

 

Also on This Day

1880 — Henry Draper Takes the First Successful Photograph of a Nebula

Evening observation; precise time not established

On the evening of September 30, 1880, American physician and astronomer Henry Draper pointed his telescope toward one of the most magnificent objects in the winter sky: the Orion Nebula. He attached photographic equipment to the telescope and exposed a plate. What appeared on it represented an important turning point in astronomy. Draper had obtained the first successful photograph of a nebula. Astronomers had been experimenting with photography for decades. The Moon, Sun, and bright stars were comparatively straightforward targets because they provided enough light to register on the insensitive photographic materials then available. Nebulae were much more difficult. They were faint and diffuse. The Orion Nebula—catalogued today as M42—was therefore an obvious but challenging target. Draper's September 30 photograph required an exposure of roughly 50 minutes. The resulting image was modest by modern standards, showing principally the bright central region around the Trapezium. But the important fact was that the nebula had left a permanent record on a photographic plate. That changed what an astronomical observation could be. For most of history, an astronomer looked through a telescope and drew or described what was visible. Photography allowed the sky to record itself. An image could be preserved. It could be measured later. Different photographs could be compared to detect change. And photographic plates could accumulate light for longer than the human eye could, eventually revealing objects too faint to see directly through the same telescope. Draper continued improving his photographs of Orion. Other astronomers soon pushed astronomical photography much farther. Long exposures revealed extraordinary structures within nebulae, star clusters, and galaxies, while photographic surveys recorded millions of stars. Eventually glass plates gave way to electronic detectors, especially CCDs, but the principle remained the same. Modern observatories—including the Hubble and James Webb space telescopes—are heirs to this transformation.

Why It Matters: Henry Draper's photograph of the Orion Nebula helped establish photography as a scientific tool for deep-sky astronomy. The telescope had extended the human eye; photography allowed astronomers to preserve, measure, compare, and eventually see beyond the limits of the eye itself.

1966 — Surveyor 2's Failure Is Formally Assessed as the Lunar Program Continues

No distinct September 30 event established

Surveyor 2 is sometimes associated with late-September space-history chronologies, but its historically meaningful events occurred earlier in the month: it launched on September 20 and crashed on the Moon on September 23 after a failed midcourse correction caused the spacecraft to tumble. Under our project's dating convention, it therefore does not belong in the September 30 chronology. Its exclusion is worth noting because anniversary lists frequently repeat ongoing missions or administrative aftermath across several dates. Our approach is to assign the event to the date on which the historically significant action actually occurred.

2009 — Soyuz TMA-16 Launches a New International Space Station Crew

07:14 UTC

On September 30, 2009, a Soyuz TMA-16 spacecraft lifted off from the Baikonur Cosmodrome in Kazakhstan. Aboard were Russian cosmonaut Maxim Suraev, NASA astronaut Jeffrey Williams, and Canadian spaceflight participant Guy Laliberté, founder of Cirque du Soleil. The launch began another crew transition aboard the International Space Station. Williams and Suraev would become members of Expeditions 21 and 22, eventually spending 167 days aboard the station. Their arrival came during a period when the International Space Station was changing rapidly. Earlier in 2009, the station's permanent crew complement had increased from three people to six, dramatically expanding the amount of scientific work that could be performed aboard the laboratory. The station had also become genuinely multinational in its daily operation. American, Russian, European, Japanese, and Canadian spacecraft, laboratories, robotic systems, astronauts, cosmonauts, and ground-control teams were increasingly functioning as parts of one enormous orbital complex. Laliberté's presence represented another aspect of the changing human presence in orbit. He traveled as a privately funded spaceflight participant under an agreement with the Russian space agency. During his 11-day journey, he promoted awareness of global water issues in what he described as a poetic social mission. Soyuz TMA-16 docked with the station on October 2. Williams and Suraev remained aboard until March 2010, while Laliberté returned to Earth in October aboard another Soyuz.

Why It Matters: Soyuz TMA-16 illustrates the increasingly international and varied character of human spaceflight in the early twenty-first century. The International Space Station was evolving from a construction project into a mature laboratory supporting long-duration crews while also opening limited opportunities for privately funded participants.

 

The Bigger Picture

September 30 provides a fitting conclusion to this month's journey because its events are fundamentally about changing the way we observe. Henry Draper changed astronomy by placing a photographic plate behind a telescope. For the first time, the faint light of a nebula could create a permanent image. The observer no longer had to rely entirely upon what the eye could see in a particular moment. The universe could leave a record of itself. Rosetta represents the same impulse carried almost unimaginably farther. Astronomers once studied comets as transient visitors crossing Earth's sky. Photography allowed them to record those appearances. Spectroscopy revealed the chemicals in their comae and tails. Spacecraft eventually flew past them. Then Rosetta did something fundamentally different. It stayed. For more than two years, the spacecraft accompanied Comet 67P as both traveled around the Sun. It watched the comet awaken. It measured gases escaping from its surface. It photographed cliffs and pits. It released a lander. And in its final hours, Rosetta descended into the environment it had been studying, continuing to observe until observation itself was no longer possible. The progression from Draper's photograph to Rosetta is therefore not as great a conceptual leap as it might first appear. Both represent humanity finding a way to overcome a limitation in observation. The eye can look only for a moment. So we invented photography. A spacecraft flying past a comet can observe it only briefly. So we built one capable of traveling alongside it. There is another important connection to September's earlier entries. On September 15, 2017, Cassini ended its exploration of Saturn by deliberately entering the planet's atmosphere. On September 21, 2003, Galileo deliberately entered Jupiter. And on September 30, 2016, Rosetta descended onto its comet. The destinations and reasons differed, but all three missions demonstrate something important about mature planetary exploration: how a mission ends can itself be part of the mission. Rosetta did not simply run out of power and disappear. Engineers transformed its ending into one final scientific experiment. Its last journey—only 19 kilometers long—became one of the most scientifically intimate portions of a voyage that had carried it billions of kilometers through the solar system. September therefore ends where so much of astronomy begins: with an observer moving closer to something mysterious and asking for one last, better look.

At a Glance

1880 — Evening; precise time not established — Henry Draper photographs the Orion Nebula, obtaining the first successful photograph of a nebula.

2009 — 07:14 UTC — Soyuz TMA-16 launches from Baikonur carrying Maxim Suraev, Jeffrey Williams, and Guy Laliberté toward the International Space Station.

2016 — Approximately 10:39 UTC, spacecraft event time — Rosetta reaches the surface of Comet 67P/Churyumov–Gerasimenko after gathering scientific observations throughout its final descent.

2016 — 11:19:37 UTC, Earth-received time — Rosetta's final signal disappears at ESA mission control, confirming the end of the mission approximately 40 minutes after the event occurred at the comet.

September 29

Return to Flight

1988 — Discovery Returns the Space Shuttle to Flight

15:37:00 UTC

On September 29, 1988, the three main engines of Space Shuttle Discovery ignited at Kennedy Space Center. Seconds later, its two solid rocket boosters came alive. At 15:37:00 UTC, Discovery lifted away from Launch Pad 39B carrying five astronauts into orbit. The moment was unlike any previous Shuttle launch. For 32 months, no Space Shuttle had flown. On January 28, 1986, Space Shuttle Challenger had broken apart 73 seconds after liftoff, killing all seven members of the STS-51L crew: Francis “Dick” Scobee, Michael Smith, Ellison Onizuka, Judith Resnik, Ronald McNair, Gregory Jarvis, and Christa McAuliffe. The accident brought Shuttle operations to an immediate halt. Investigators traced the physical cause of the disaster to the failure of seals in a joint of the right solid rocket booster. Hot gases escaped through the joint, eventually contributing to the catastrophic destruction of the vehicle. But the investigation went beyond hardware. The Presidential Commission examining the accident also identified serious problems in decision-making, communication, and NASA's organizational culture. Returning to flight therefore required more than replacing a defective component. NASA redesigned the solid rocket booster field joints, made numerous modifications to Shuttle hardware and procedures, strengthened safety oversight, and reconsidered how risks were evaluated and communicated. Discovery itself underwent more than 200 modifications before STS-26. The crew chosen to make the return was deliberately experienced. Commander Frederick “Rick” Hauck, pilot Richard Covey, and mission specialists John Lounge, George “Pinky” Nelson, and David Hilmers had all flown in space before. They became the first all-veteran American spaceflight crew since Apollo 11. Their spacecraft also reflected lessons learned from Challenger. During launch and landing, the astronauts wore newly introduced Launch and Entry Suits, providing greater protection than the clothing worn by Shuttle crews immediately before the accident. Discovery also carried equipment for a new emergency escape system that could allow astronauts, under certain circumstances, to leave a disabled orbiter during controlled gliding flight. But first the spacecraft had to launch. More than a million spectators reportedly gathered along Florida's Space Coast. After weather caused a delay of approximately an hour and a half, the countdown resumed. Discovery rose from the pad. About two minutes later came one of the flight's most closely watched moments. The redesigned solid rocket boosters completed their burns normally and separated. Discovery continued toward orbit. NASA's flight controllers, engineers, astronauts, and spectators had just watched the Shuttle safely pass the point at which Challenger had been lost. Approximately eight and a half minutes after liftoff, Discovery's main engines shut down normally. About 40 minutes into the mission, the astronauts fired the Orbital Maneuvering System engines to circularize their orbit. Hauck radioed Mission Control: “It's nice to be in orbit.” STS-26 was intentionally conservative. Its principal objective was to demonstrate that the redesigned Shuttle system could operate safely. But the mission also had important work to do. Approximately six hours after launch, the crew deployed TDRS-3, a Tracking and Data Relay Satellite. A similar satellite had been lost aboard Challenger. The TDRS network allowed spacecraft in low Earth orbit to communicate with Earth through satellites in much higher geosynchronous orbits, greatly increasing the amount of each orbit during which astronauts and spacecraft could remain in contact with ground controllers. Discovery remained in space for four days. On October 3, it landed safely at Edwards Air Force Base in California. The Shuttle program had returned.

Why It Matters: STS-26 restored American human spaceflight after the Challenger disaster, but its significance was greater than simply resuming launches. The mission tested redesigned hardware and new safety procedures developed after one of NASA's darkest moments. It demonstrated that returning from catastrophe requires understanding not only what hardware failed, but also the human and organizational systems that allowed failure to occur.

 

Also on This Day

1962 — Alouette I Places Canada Among the Spacefaring Nations

UTC launch time uncertain; approximately 05:30–07:06 UTC in surviving official accounts

On September 29, 1962 UTC, a Thor-Agena rocket lifted off from California carrying a small Canadian spacecraft named Alouette I. The satellite marked Canada's arrival in the Space Age. Only the Soviet Union and the United States had previously designed and built their own artificial Earth satellites. Canada became the third nation to do so. Alouette I emerged from an invitation NASA issued in 1958 for international participation in its new satellite program. Canadian scientists John Chapman and Eldin Warren, working at the Defence Research Telecommunications Establishment, proposed building a satellite that could investigate the ionosphere from above. The ionosphere is a region of Earth's upper atmosphere containing electrically charged particles. It has enormous practical importance because it affects the propagation of radio waves and therefore long-distance communications. Scientists had studied the ionosphere from the ground by transmitting radio signals upward and examining their reflections. Alouette would reverse the geometry. Orbiting above much of the ionosphere, it could transmit radio signals downward and investigate the structure of the region from the top. The challenge was formidable. Canada had never built a satellite. Engineers incorporated technologies that were still relatively new, including transistors, solar cells, and ingenious deployable antennas. The spacecraft's long antennas were designed to unroll after reaching orbit. Alouette I weighed approximately 145 kilograms and entered an orbit roughly 1,000 kilometers above Earth. It worked extraordinarily well. The spacecraft had been designed for a lifetime of about one year. Instead, it returned useful scientific data for more than ten years and produced more than one million ionospheric images. Its success led to further Canadian-American cooperation through the International Satellites for Ionospheric Studies program, including Alouette II, ISIS I, and ISIS II. It also helped establish Canadian expertise in spacecraft engineering that would later contribute to communications satellites, robotic systems such as the Canadarm, and Canada's continuing role in international space exploration. The name itself was distinctly Canadian. “Alouette”—French for meadowlark—evoked flight while also acknowledging Canada's French-language heritage.

Why It Matters: Alouette I made Canada the first country after the Soviet Union and United States to design and build its own satellite. Its extraordinary ten-year scientific lifetime demonstrated that important space science need not be confined to the two Cold War superpowers and helped establish Canada as a significant participant in space research.

1977 — Salyut 6 Begins a New Era of Space-Station Operations

Launch time not established

On September 29, 1977, the Soviet Union launched Salyut 6, a space station whose design would fundamentally change how humans lived and worked in orbit. Earlier Salyut stations had already demonstrated that crews could occupy orbital laboratories for extended periods. But they had an important limitation. A station with only one docking port could accommodate only one Soyuz spacecraft at a time. Because the crew needed its Soyuz to return home, another spacecraft could not easily dock while the resident crew was aboard. Salyut 6 had two docking ports. That seemingly straightforward change transformed space-station operations. A resident crew could remain aboard with its Soyuz docked at one end while another vehicle arrived at the other. Visiting crews could come aboard. Replacement spacecraft could be delivered. Most importantly, uncrewed Progress cargo spacecraft could bring food, water, equipment, scientific supplies, and propellant. For the first time, an inhabited space station could be resupplied routinely while its crew remained aboard. That capability made progressively longer missions practical. Salyut 6 would host numerous Soviet and international crews. Its cosmonauts repeatedly broke human-spaceflight endurance records, eventually remaining aboard for missions lasting roughly six months. The station also became an important venue for the Soviet Intercosmos program, through which cosmonauts from several allied countries flew in space. The operational model established aboard Salyut 6—resident crews, visiting crews, multiple docking ports, cargo deliveries, orbital refueling, repairs, and long-duration habitation—would be developed further aboard Salyut 7 and Mir. Today those practices are routine aboard modern space stations.

Why It Matters: Salyut 6 helped transform a space station from a laboratory visited for a single expedition into an orbital facility capable of sustained operations. Its second docking port and Progress resupply system established an operational model that ultimately led toward continuously inhabited stations such as Mir and the International Space Station.

2011 — China Launches Tiangong-1

13:16 UTC

On September 29, 2011, China launched Tiangong-1, an experimental orbital laboratory that represented another major step in the development of the country's human-spaceflight program. Its name meant “Heavenly Palace.” Tiangong-1 was not a large permanently inhabited space station comparable with Mir or the International Space Station. It was something more transitional: a laboratory in which China could learn and demonstrate technologies required to build such a station. One capability was particularly important: rendezvous and docking. Reaching orbit is one challenge. Bringing two spacecraft traveling thousands of meters per second around Earth into the same orbit, guiding them toward one another, and joining them safely is another. Without dependable rendezvous and docking, constructing a modular space station is effectively impossible. Tiangong-1 provided the target. In November 2011, the uncrewed Shenzhou 8 spacecraft successfully rendezvoused and docked with it, demonstrating China's first orbital docking. Human crews followed. Shenzhou 9 docked with Tiangong-1 in 2012, carrying China's first woman in space, Liu Yang. Shenzhou 10 visited in 2013 for another crewed mission. The small laboratory thus served as a technological bridge between China's early Shenzhou missions and its much more ambitious plans for long-term human habitation in orbit. Those plans eventually produced the modular Tiangong space station, assembled in orbit beginning with the Tianhe core module in 2021.

Why It Matters: Tiangong-1 gave China practical experience in rendezvous, docking, orbital habitation, and station operations. It was an essential stepping-stone from independent crewed spaceflight toward China's construction and operation of a permanently crewed modular space station.

 

The Bigger Picture

September 29 tells a story about how spaceflight grows from an extraordinary achievement into a sustainable capability. Alouette I demonstrates that progression at the national level. In 1962, the ability to build a satellite was still associated overwhelmingly with the two Cold War superpowers. Canada demonstrated that another nation could design a sophisticated scientific spacecraft, place it in orbit through international cooperation, and produce important research for more than a decade. Salyut 6 addressed sustainability differently. Putting people aboard a space station was no longer enough. If humans were truly going to remain in orbit, they needed a way to receive supplies, replace equipment, welcome other crews, and keep the station operating. Two docking ports helped make that possible. Tiangong-1 represents another nation climbing a similar technological ladder. China had learned to launch astronauts. Then it learned to conduct a spacewalk. With Tiangong-1, it began mastering rendezvous, docking, and orbital habitation—the capabilities required to construct a larger station. And Discovery's return to flight reminds us that maintaining a capability also means confronting what happens when the system fails catastrophically. The Challenger disaster demonstrated that technological maturity can never be assumed. Spaceflight remains unforgiving. The lesson of STS-26 was therefore not simply: We can fly again. The deeper question was: What have we changed because of what happened? That question belongs not only to NASA but to the entire history of exploration. Alouette I required Canada to develop capabilities it had never possessed. Salyut 6 required engineers to rethink how a station could be supported. Tiangong-1 required China to master techniques needed for a future station. STS-26 required NASA to examine a system that had failed and determine how—and whether—it could safely return to flight. September 29 therefore illustrates that exploration does not advance through achievement alone. It advances when institutions learn. Build → operate → discover weaknesses → adapt → build something better. That cycle has carried spaceflight from small experimental satellites to spacecraft that can operate for decades and stations that can remain inhabited year after year.

At a Glance

1962 — Approximately 05:30–07:06 UTC; exact time uncertain — Alouette I launches from California, making Canada the third nation to design and build its own artificial Earth satellite.

1977 — Launch time not established — The Soviet Union launches Salyut 6, whose two docking ports and ability to receive Progress resupply spacecraft transform long-duration space-station operations.

1988 — 15:37:00 UTC — Space Shuttle Discovery launches on STS-26, returning the Shuttle program to flight 32 months after the Challenger disaster.

2011 — 13:16 UTC — China launches Tiangong-1, an experimental orbital laboratory that will help establish rendezvous, docking, and habitation capabilities needed for a future modular space station.

September 28

A New Road to Orbit

2008 — Falcon 1 Becomes the First Privately Developed Liquid-Fueled Rocket to Reach Orbit

23:15 UTC

On September 28, 2008, a slender two-stage rocket rose from Omelek Island, part of Kwajalein Atoll in the Pacific Ocean. It was called Falcon 1. The rocket had flown three times before. All three attempts had failed. The fourth would change the history of commercial spaceflight. At 23:15 UTC, Falcon 1 lifted off carrying a 165-kilogram inert payload known as RatSat, or Demosat. Minutes later, the rocket's second stage successfully reached Earth orbit. Falcon 1 had become the first privately developed and funded liquid-fueled rocket to reach orbit. Its builder was Space Exploration Technologies Corporation—SpaceX—a company founded only six years earlier. The achievement had been anything but inevitable. Falcon 1's first flight, in March 2006, ended less than a minute after launch when a fuel leak led to an engine fire. The second attempt, in March 2007, traveled much farther but failed to achieve orbit after problems during the second-stage portion of the flight. The third attempt came on August 3, 2008. This time the first stage performed well, but residual thrust caused it to recontact the second stage after separation. The rocket was lost along with several payloads. The failure was particularly painful because Falcon 1 was no longer simply an experimental vehicle. It was carrying real spacecraft. SpaceX engineers identified the problem and prepared another rocket with remarkable speed. Only 55 days later, Falcon 1 stood ready again. Flight 4 carried no operational satellite. Instead, RatSat served as a payload simulator. The first stage's Merlin engine carried the vehicle through the lower atmosphere. After stage separation, the second-stage Kestrel engine continued the climb. This time, the stages separated cleanly. The second stage reached an initial orbit of approximately 622 by 643 kilometers above Earth. Falcon 1 had succeeded. The payload itself remained attached to the second stage, but that did not change the central achievement: the launch vehicle had reached orbit. The importance of that accomplishment became clearer with time. Falcon 1 flew only once more, successfully, in July 2009. SpaceX then shifted its attention to the much larger Falcon 9 and the Dragon spacecraft. In 2010, Falcon 9 reached orbit on its first flight. In 2012, Dragon became the first commercial spacecraft to deliver cargo to the International Space Station. In 2015, a Falcon 9 first stage returned from an orbital-class mission and landed vertically on land. In 2016, another landed on a ship at sea. In 2020, SpaceX's Crew Dragon carried NASA astronauts to the International Space Station, restoring crewed orbital launch capability from the United States. And then, exactly 18 years after Falcon 1's breakthrough, another SpaceX rocket lifted from Texas. This one was very different. Falcon 1 had been designed to prove that a small privately developed rocket could reach orbit. Starship was being developed to change the scale at which payloads—and eventually people—could be transported through space. On September 28, 2008, however, none of that future was assured. Falcon 1 was small. Its operational life was brief. But Flight 4 demonstrated that a privately developed liquid-fueled launch vehicle could reach orbit.

Why It Matters: Falcon 1's fourth flight marked a turning point in commercial spaceflight. The achievement demonstrated that a comparatively young private company could develop and operate an orbital launch vehicle, helping open a path toward the commercial launch, cargo, human-spaceflight, and reusable rocket systems that became increasingly important during the following decades.

 

2026 — Starship Reaches Earth Orbit for the First Time

12:48 UTC

Eighteen years to the day after Falcon 1 first reached orbit, SpaceX tried again to cross an orbital threshold. The scale was almost unrecognizable. At 12:48 UTC on September 28, 2026, the enormous Starship-Super Heavy launch vehicle lifted from Starbase, Texas, on Starship Flight 14. The mission was uncrewed. It was the fourteenth integrated flight of the Starship system. The previous thirteen flights had intentionally followed suborbital trajectories. Flight 14 was different. For the first time, SpaceX intended to place Starship into Earth orbit. Starship consists of two enormous reusable stages. The lower stage, Super Heavy, provides the tremendous thrust required to lift the vehicle away from Earth. Above it sits Starship, which serves simultaneously as the system's upper stage and spacecraft. Together, the current configuration stands approximately 124 meters—407 feet—tall. That makes the contrast with Falcon 1 extraordinary. Falcon 1 stood only about 21 meters tall. The rocket that established SpaceX's orbital capability in 2008 could almost have been placed several times end to end alongside Starship. But size was not the most important difference. The two vehicles represented fundamentally different ambitions. Falcon 1 was intended to place relatively small payloads into orbit. Starship is being developed as a fully and rapidly reusable transportation system capable of carrying very large payloads to Earth orbit and supporting future missions beyond Earth. NASA has also selected a specialized Starship derivative as a lunar landing system for its Artemis program. Before Starship could fulfill such ambitions, however, it had to accomplish one of the most fundamental requirements of any orbital transportation system. It had to reach orbit. Flight 14 began successfully. Super Heavy carried Starship through the lower atmosphere. The stages separated using the hot-staging technique developed during earlier test flights, in which Starship ignites its engines while still connected to the booster. Super Heavy then began its return toward the Gulf. The flight was not completely nominal. Some booster engines experienced problems during descent. More significantly, after stage separation, one of Starship's three sea-level Raptor engines shut down prematurely. For a time, it was uncertain whether the spacecraft would be able to proceed into orbit. Mission controllers evaluated the vehicle's condition. Then Starship performed the planned orbital-insertion maneuver. It worked. Starship was in orbit around Earth for the first time. The achievement crossed a line that all previous integrated Starship flights had deliberately stopped short of crossing. But Flight 14 was not simply an orbital demonstration. Starship was carrying a real operational payload. Inside were 26 next-generation Starlink V3 satellites. Earlier in 2026, Flight 13 had demonstrated deployment of Starlink V3 spacecraft onto a suborbital trajectory. Those test satellites were expected to reenter shortly afterward. Flight 14 was different. Once Starship reached an orbit roughly 269 kilometers above Earth, it began releasing the 26 satellites. One after another, they separated from the spacecraft. All 26 were successfully deployed into their intended orbital environment. For the first time, Starship had not merely reached space as an experimental vehicle. It had delivered operational satellites to Earth orbit. That distinction matters. A launch vehicle becomes useful not simply when it can fly. Its purpose is to transport something. A scientific spacecraft. A communications satellite. Cargo. A crew. Or another vehicle bound for somewhere farther away. Falcon 1's breakthrough in 2008 had been accomplished with an inert payload that remained attached to its upper stage. Starship's orbital breakthrough eighteen years later included the deployment of working spacecraft. The mission nevertheless remained a developmental flight. The engine problem changed the planned profile. Flight 14 had originally been expected to remain in orbit for nearly ten hours and complete approximately six circuits of Earth. Instead, mission controllers shortened the flight to roughly three hours. Starship eventually began its controlled return. It reentered Earth's atmosphere and descended toward the Pacific Ocean. Near the end of the descent, the vehicle performed its characteristic flip maneuver, turning from a largely horizontal orientation toward vertical. It reached the ocean in a controlled splashdown. The spacecraft was not intended to be recovered from the sea for reuse. The Super Heavy booster likewise ended its flight in the water rather than returning to the launch site for capture. So Flight 14 did not demonstrate the complete, rapidly reusable transportation system SpaceX ultimately intends Starship to become. That work remained unfinished. But history is often made through intermediate thresholds. The Wright brothers' first flight did not produce practical commercial aviation. Sputnik did not create modern satellite communications. Falcon 1 did not create routine reusable launch operations. Each established that something previously uncertain could be done. Flight 14 established another such threshold. Starship could reach Earth orbit. And it could carry useful payloads there. The date made the achievement particularly striking. On September 28, 2008, SpaceX reached orbit for the first time. On September 28, 2026, Starship reached orbit for the first time. Exactly eighteen years separated the two flights. One rocket was a small vehicle launched from a remote Pacific island after three failures. The other was the largest launch system yet flown, rising from a sprawling launch complex on the Texas coast. Between them lay much of the history of twenty-first-century commercial spaceflight.

Why It Matters: Starship Flight 14 marked the vehicle's first successful entry into Earth orbit and its first deployment of operational satellites into orbit. Although an engine problem shortened the planned mission and the system had not yet achieved its goal of full and rapid reusability, reaching orbit moved Starship from a series of suborbital developmental flights into a new phase of testing and operations. Occurring exactly 18 years after Falcon 1 first reached orbit, the flight also provided a remarkable measure of how far SpaceX's launch capabilities had developed.

 

Also on This Day

1951 — Seth Nicholson Discovers Ananke, a Moon of Jupiter

Observation time not established

On September 28, 1951, American astronomer Seth Barnes Nicholson discovered another member of Jupiter's growing family of moons. The discovery was made photographically using the 100-inch Hooker Telescope at Mount Wilson Observatory in California. The object would eventually receive the name Ananke. By the middle of the twentieth century, astronomers had learned that Jupiter possessed two very different kinds of satellites. The four large moons discovered by Galileo in 1610—Io, Europa, Ganymede, and Callisto—travel in relatively regular orbits close to the planet's equatorial plane. Farther away are much smaller irregular satellites. Ananke belongs to this second population. It travels around Jupiter in a distant, eccentric, highly inclined retrograde orbit, meaning that it moves in the direction opposite Jupiter's rotation. Those characteristics provide clues to its origin. Rather than forming alongside Jupiter in the disk of material surrounding the young planet, Ananke was probably associated with an object captured by Jupiter's gravity. Today astronomers recognize an entire Ananke group of small retrograde moons with similar orbital characteristics. One leading explanation is that they are fragments produced when a larger captured body was broken apart by a collision. Ananke itself has a mean radius of only about 14 kilometers. Nicholson was particularly skilled at discovering faint planetary satellites. During his career at Mount Wilson, he discovered several moons of Jupiter, greatly expanding the known architecture of the Jovian system. The contrast with modern planetary exploration is striking. Nicholson discovered Ananke as a tiny point recorded on a photographic plate. Decades later, spacecraft would transform other Jovian moons from points of light into complex worlds containing volcanoes, oceans, magnetic fields, mountains, craters, and icy terrain. Yet distant irregular moons such as Ananke remain reminders that even the planetary systems closest to us still contain populations whose histories must be reconstructed largely through careful astronomical observation.

Why It Matters: Ananke's discovery expanded the known Jovian satellite system and contributed to recognition that giant planets possess families of small irregular moons very different from their large regular satellites. Their unusual orbits preserve clues to capture, collision, and the violent early history of the solar system.

1953 — Edwin Hubble Dies

Time unknown

On September 28, 1953, American astronomer Edwin Powell Hubble died in San Marino, California. Few astronomers had done more to enlarge humanity's conception of the universe. When Hubble began his most important work, astronomers were still debating the nature of the faint spiral objects visible through telescopes. Were they relatively small clouds located within the Milky Way? Or were they enormous systems of stars lying far beyond it? Using the 100-inch Hooker Telescope at Mount Wilson—the same instrument Seth Nicholson used in discovering Ananke—Hubble identified Cepheid variable stars in the Andromeda Nebula. Cepheids were enormously valuable because their pulsation periods could be used to estimate their intrinsic luminosities. By comparing their actual luminosities with how faint they appeared from Earth, astronomers could calculate their distances. Hubble's measurements demonstrated that Andromeda was far too distant to lie within the Milky Way. The universe was suddenly much larger. The Milky Way was not the universe. It was one galaxy among many. Hubble then helped develop a system for classifying galaxies according to their appearance—spirals, barred spirals, ellipticals, and irregular systems. His work soon contributed to an even more profound discovery. Astronomers had measured the spectra of galaxies and found that many were redshifted, indicating recession. Combining galaxy-distance measurements with recession velocities, Hubble published in 1929 the relationship between distance and recession velocity that became fundamental to observational cosmology. The interpretation developed into one of the central pieces of evidence that the universe is expanding. The history deserves an important qualification. Hubble did not accomplish this alone. Vesto Slipher had already performed the difficult spectroscopic work that established the large radial velocities of spiral nebulae. Belgian astronomer and physicist Georges Lemaître had derived an expanding-universe solution from general relativity and, in 1927, published a relationship between distance and recession velocity before Hubble's famous 1929 paper. Modern historical treatments therefore place Hubble's achievements within a larger community of theoretical and observational work. His importance nevertheless remains immense. The Hubble Space Telescope, launched in 1990, was named in his honor. Its observations would extend the kind of extragalactic astronomy Hubble helped establish into realms he could scarcely have imagined.

Why It Matters: Edwin Hubble helped demonstrate that the Milky Way is only one galaxy among an enormous population of galaxies and provided crucial observational evidence associated with the expansion of the universe. His work was central to the transformation of astronomy into modern observational cosmology.

1971 — Luna 19 Launches to Map the Moon

Launch time not established

On September 28, 1971, the Soviet Union launched Luna 19, continuing an increasingly sophisticated program of robotic lunar exploration. By this point, Soviet spacecraft had already accomplished several historic lunar firsts. Luna 2 had become the first human-made object to reach another celestial body. Luna 3 had photographed the Moon's far side. Luna 9 had achieved the first successful soft landing. Luna 10 had become the first artificial satellite of the Moon. Luna 16 had returned lunar material robotically to Earth. And Lunokhod 1 was operating as the first successful remotely controlled rover on another world. Luna 19 represented another kind of investigation. Rather than landing, the spacecraft entered lunar orbit in early October and began systematically studying the Moon from above. Its scientific program included investigations of the Moon's gravitational field, surface environment, radiation conditions, and other properties. Orbital tracking was particularly useful for improving knowledge of variations in lunar gravity. Those variations were not merely academic. Earlier lunar spacecraft had revealed gravitational concentrations known as mascons—mass concentrations— beneath some of the Moon's great impact basins. Their gravitational pull could perturb the orbit of a spacecraft. Understanding the lunar gravity field was therefore important both scientifically and operationally. Luna 19 continued returning information from lunar orbit into 1972.

Why It Matters: Luna 19 formed part of the Soviet Union's broad robotic investigation of the Moon. Its orbital observations helped refine understanding of the lunar environment and gravity field, demonstrating that exploration required not merely reaching or landing on the Moon but systematically mapping and measuring it.

 

The Bigger Picture

September 28 now tells an unusually broad story about how humanity extends its reach. In 1951, Seth Nicholson used Mount Wilson's 100-inch Hooker Telescope to identify a tiny new moon orbiting Jupiter. Two years later, Edwin Hubble died, leaving behind a scientific legacy built in large part with that same telescope. That coincidence remains particularly evocative. Nicholson used the Hooker Telescope to enlarge our knowledge of a planetary system. Hubble used it to enlarge our conception of the universe. One instrument could reveal a faint moon accompanying a nearby planet and help demonstrate that apparently faint patches of light were actually enormous galaxies far beyond our own. Then came the Space Age. Luna 19 no longer needed to examine the Moon from Earth. Humanity could send an observatory into orbit around the Moon itself. And then another transformation began. For most of the Space Age, the ability to place substantial objects into orbit belonged principally to national governments and the large industrial organizations working for them. Falcon 1 suggested another model. Private companies might develop and operate their own orbital launch systems and sell transportation to governments, scientists, businesses, and other customers. But the Falcon 1 story also demonstrates that technological change rarely proceeds smoothly. The rocket that reached orbit on September 28 was Flight 4. Flights 1, 2, and 3 had failed. Had the story ended with any one of those attempts, Falcon 1 might have been remembered as an unsuccessful experiment. Instead, engineers examined what had gone wrong, changed the vehicle, and tried again. Fifty-five days after the third failure, Falcon 1 reached orbit. Then history provided September 28 with an extraordinary sequel. Exactly 18 years later, Starship Flight 14 reached orbit. The comparison between the two spacecraft almost summarizes the transformation. Falcon 1 was about 21 meters tall. Starship and Super Heavy stood roughly 124 meters tall. Falcon 1 carried an inert payload simulator that remained attached to its upper stage. Starship deployed 26 operational communications satellites. Falcon 1 demonstrated that SpaceX could reach orbit. Starship Flight 14 demonstrated that an enormously larger SpaceX vehicle could reach orbit and begin performing useful transportation work there. Yet the parallel becomes even more interesting because neither event represented a finished technology. Falcon 1's success was followed by Falcon 9, Dragon, reusable boosters, commercial cargo flights, and crewed missions. Starship Flight 14 likewise did not demonstrate everything its designers ultimately intend. The flight encountered engine problems. Its planned mission was shortened. Neither stage returned for reuse. Many difficult engineering milestones remain. That uncertainty belongs in the historical record too. A milestone is not the same thing as a finished journey. September 28 therefore illustrates something we encounter repeatedly throughout the history of astronomy and space exploration: progress is not the absence of failure. Very often, progress is what happens when people understand a failure well enough to make the next attempt different. It also reminds us that the significance of a technological achievement is sometimes clearest only years later. In 2008, nobody could know precisely what would grow from Falcon 1 Flight 4. We now have eighteen years of history with which to evaluate it. For Starship Flight 14, we do not. We know what happened. We know what threshold was crossed. But its ultimate place in the history of spaceflight will depend upon what comes next. That is an appropriate distinction for a project devoted to history. We can recognize a genuine milestone without pretending that its entire significance is already known. September 28 takes us from a photographic plate at Mount Wilson, to the scale of galaxies, to an orbiter circling the Moon, to a small commercial rocket struggling to reach Earth orbit, and finally to a giant experimental transportation system reaching orbit on the anniversary of that earlier breakthrough. The progression is remarkable: observe → understand → explore → reach orbit → expand what orbit can make possible.

 

At a Glance

1951 — Observation time not established — Seth Barnes Nicholson discovers Ananke, an irregular moon of Jupiter, on a photograph obtained with Mount Wilson's 100-inch Hooker Telescope.

1953 — Time unknown — Edwin Hubble dies in California, leaving a legacy that helped establish extragalactic astronomy and modern observational cosmology.

1971 — Launch time not established — The Soviet Union launches Luna 19, beginning a mission to study the Moon from orbit.

2008 — 23:15 UTC — Falcon 1 lifts off from Omelek Island and becomes the first privately developed and funded liquid-fueled rocket to reach Earth orbit.

2026 — 12:48 UTC — Starship Flight 14 launches from Starbase, Texas; Starship subsequently reaches Earth orbit for the first time and deploys 26 operational Starlink V3 satellites.