Before the first launch
The idea of reaching space came before the means to do it. In the early 1900s, the Russian schoolteacher and theorist Konstantin Tsiolkovsky published work showing mathematically why rockets could, in principle, work in the vacuum of space and why multi-stage designs would help. In the United States, Robert Goddard launched the first liquid-fueled rocket in 1926, a small flight that lasted only seconds but showed the approach was practical. Hermann Oberth in Germany wrote about similar ideas, and amateur rocket societies in several countries experimented through the 1930s.
The decisive step came from military development. Germany’s V-2 ballistic missile, first launched successfully in 1942 and used in combat from 1944, was the first large rocket to reach the edge of space. After World War II, the United States and the Soviet Union each took over V-2 hardware and recruited engineers who had worked on it. Those postwar programs became the technical base for the first space rockets.
The first satellites
On October 4, 1957, the Soviet Union launched Sputnik 1, the first artificial satellite. It was small, roughly the size of a beach ball, and its main job was to broadcast radio beeps that anyone with a receiver could hear. A month later Sputnik 2 carried a dog named Laika, who did not survive the flight. The United States launched Explorer 1 on January 31, 1958, and its instruments helped reveal the radiation belts around Earth. NASA was created later that year.
The decade that followed saw rapid firsts, which are covered in more detail in the story of the space race. The Soviet Union sent Yuri Gagarin around Earth on April 12, 1961, the first human spaceflight. The United States followed with Alan Shepard’s short suborbital flight in May 1961 and John Glenn’s orbital flight in 1962. Valentina Tereshkova became the first woman in space in 1963, and Alexei Leonov made the first spacewalk in 1965.
Satellites were also finding practical jobs. Early satellites included weather observers, communications relays and navigation experiments, and those uses are the reason orbit became a place of everyday infrastructure, not only of national prestige.
The Moon and beyond
In 1961, President John F. Kennedy committed the United States to landing a person on the Moon before the decade ended. The Apollo program took years of testing, and it suffered a tragedy when three astronauts died in a launch-pad fire during a ground test in January 1967. Apollo 8 carried a crew around the Moon in December 1968, and Apollo 11 landed on July 20, 1969, with Neil Armstrong and Buzz Aldrin walking on the surface. Six landings in total took place, ending with Apollo 17 in December 1972. No one has walked on the Moon since.
Robotic probes made their own history alongside the crewed flights. Soviet and American spacecraft flew past, orbited and landed on the Moon, Venus and Mars. The two Voyager probes, launched in 1977, toured the outer planets and are now far beyond them, a landmark in deep space exploration that still returns data.
Stations and the shuttle era
After Apollo, attention turned to living and working in orbit. The Soviet Union launched Salyut 1, the first space station, in 1971, and the United States flew Skylab in 1973. The Soviet and later Russian Mir station, begun in 1986, hosted crews for many years. These programs are described further in the history of space stations.
The U.S. Space Shuttle flew its first mission in April 1981 and its last in 2011. It was a reusable orbiter that carried crews, satellites and laboratory modules, and it launched the Hubble Space Telescope in 1990. Hubble and later observatories changed what astronomers could learn with optical telescopes from above the atmosphere. The program also suffered two losses: Challenger in 1986 and Columbia in 2003, both of which led to major safety reviews.
In 1975, an American Apollo and a Soviet Soyuz spacecraft docked in orbit, an early sign that rivals could cooperate. That thread continued through the Shuttle-Mir missions of the 1990s and led to the International Space Station. Its first module launched in 1998, and it has had crews aboard continuously since November 2000, supported by an alliance involving the United States, Russia, Europe, Japan and Canada. The wider story of international space cooperation grew from this experience.
A wider field
Spaceflight is no longer limited to two countries. China launched its first crewed mission in 2003 and later built its own station, Tiangong. India, Japan and European countries operate their own missions, and many nations now run satellites. At the same time, companies have taken a larger role in launching cargo and crews, and commercial spaceflight is now a normal part of the field. Reusable rockets, which land and fly again, are a clear change from the earlier model of throwing the rocket away after each launch.
New challenges came with the growth. Thousands of satellites and pieces of leftover hardware now share orbit, and orbital debris is a concern for planners. Government agencies and private firms are also discussing future Moon and Mars missions, though the plans and schedules for those change often and should be treated with caution.
How to read the timeline
Spaceflight history is often told as a series of firsts, but it is also a story of engineering learned through failure, of changing budgets and politics, and of tools that ended up serving everyday life on Earth. For details of any single stage, the dates above are a reasonable guide, but exact figures and mission lists are worth checking against an agency’s own records.