Human spaceflightSpaceflight with a crew or passengers
AstronautAn astronaut (from the Ancient Greekἄστρον (astron), meaning 'star', and ναύτης (nautes), meaning 'sailor') is a person trained, equipped, and deployed by a human spaceflight program to serve as a commander or crew member of a spacecraft. Although generally reserved for professional space travelers, the term is sometimes applied to anyone who travels into space, including scientists, politicians, journalists, and space tourists.
Yuri GagarinSoviet cosmonaut (1934–1968)Yuri Alekseyevich Gagarin (9 March 1934 – 27 March 1968) was a Soviet pilot and cosmonaut who became the first person to journey into outer space during the first successful crewed spaceflight. He was launched from the Baikonur Cosmodrome in the Kazakh SSR. Travelling on Vostok 1, Gagarin completed one orbit of Earth on 12 April 1961. The flight took 108 minutes.
Vostok 1Vostok 1 (Russian: Восток, lit. 'East' or 'Orient') was the first spaceflight of the Vostok programme and the first human orbital spaceflight in history. The Vostok 3KA space capsule was launched from Baikonur Cosmodrome on 12 April 1961, with Soviet cosmonaut Yuri Gagarin aboard, making him the first human to reach orbital velocity around the Earth and to complete a full orbit around the Earth.
Project MercuryInitial American crewed spaceflight program (1958–1963)Project Mercury was the first human spaceflight program of the United States, running from 1958 through 1963. An early highlight of the Space Race, its goal was to put a man into Earth orbit and return him safely, ideally before the Soviet Union.
Vostok (rocket family)Vostok (Russian: Восток, lit. 'East') was a family of rockets derived from the Soviet R-7 Semyorka ICBM and was designed for the human spaceflight programme. This family of rockets launched the first artificial satellite (Sputnik 1) and the first crewed spacecraft (Vostok) in human history. It was a subset of the R-7 family of rockets. On March 18, 1980, a Vostok-2M rocket exploded on its launch pad at Plesetsk during a fueling operation, killing 48 people.
Vostok (spacecraft)Vostok (Russian: Восток, lit. 'East') was a class of single-pilot crewed spacecraft built by the Soviet Union. The first human spaceflight was accomplished with Vostok 1 on April 12, 1961, by Soviet cosmonaut Yuri Gagarin. The Vostok programme made six crewed spaceflights from 1961 through 1963. This was followed in 1964 and 1965 by two flights of Vostok spacecraft modified for up to three pilots, identified as Voskhod.
Low Earth orbitA low Earth orbit (LEO) is an orbit around Earth with a period of 128 minutes or less (making at least 11.25 orbits per day) and an eccentricity less than 0.25. Most of the artificial objects in outer space are in LEO, peaking in number at an altitude around 800 km (500 mi), while the farthest in LEO, before medium Earth orbit (MEO), have an altitude of 2,000 kilometers, about one-third of the radius of Earth and near the beginning of the inner Van Allen radiation belt.
R-7 SemyorkaThe R-7 Semyorka (Russian: Р-7 Семёрка, lit. 'number seven', GRAU index: 8K71) was a Soviet missile developed during the Cold War, and the world's first intercontinental ballistic missile. The basis for the R-7 rocket family, it was adapted into the world's first orbital launch vehicle, Sputnik, and the crewed orbital launch vehicles Vostok. R-7 derivatives are the most launched rocket family ever with over 2,000 flights as of 2026, primarily Soyuz variants.
Zenit (satellite)Zenit (Russian: Зени́т, lit.'Zenith', IPA:) was a series of military photoreconnaissance satellites launched by the Soviet Union between 1961 and 1994. To conceal their nature, all flights were given the public Kosmos designation. DescriptionThe basic design of the Zenit satellites was similar to the Vostok crewed spacecraft, sharing the return and service modules.
Soviet UnionThe Soviet Union, officially the Union of Soviet Socialist Republics (USSR), was a transcontinental country that spanned much of Eurasia from its formation in 1922 until its dissolution in 1991. It was the world's third-most populous country, the largest by area, and bordered twelve other countries.
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