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Space Race: Soviet spacecraft Soyuz 4 and Soyuz 5 perform the first-ever docking of crewed spacecraft in orbit, the first-ever transfer of crew from one space vehicle to another, and the only time such a transfer was accomplished with a space walk.
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Space Race
US–USSR spaceflight capability rivalry
The Space Race was a 20th-century competition between the Cold War rivals, the United States and the Soviet Union, to achieve superior spaceflight capability. It had its origins in the ballistic missile-based nuclear arms race between the two nations following World War II and…Source: Wikipedia (CC BY-SA)
Soyuz 4
Crewed flight of the Soyuz programme
Soyuz 4 was launched on 14 January 1969, carrying cosmonaut Vladimir Shatalov on his first flight. The aim of the mission was to dock with Soyuz 5, transfer two crew members from that spacecraft, and return to Earth. The previous Soyuz flight was also a docking attempt but…Source: Wikipedia (CC BY-SA)
Soyuz 5
Crewed flight of the Soyuz programme
Soyuz 5 was a Soyuz mission using the Soyuz 7K-OK spacecraft launched by the Soviet Union on 15 January 1969, which docked with Soyuz 4 in orbit. It was the first docking of two crewed spacecraft of any nation, and the first transfer of crew from one space vehicle to another of…Source: Wikipedia (CC BY-SA)
Low Earth orbit
Orbit around Earth between 160 and 2000 km
A low Earth orbit (LEO) is an orbit around Earth with a period of 128 minutes or less 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…Source: Wikipedia (CC BY-SA)
Extravehicular activity
Activity done by an astronaut or cosmonaut outside a spacecraft
Extravehicular activity (EVA) is any activity done by an astronaut in outer space outside a spacecraft. In the absence of a breathable Earthlike atmosphere, the astronaut is completely reliant on a space suit for environmental support. EVA includes spacewalks and lunar or…Source: Wikipedia (CC BY-SA)