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On July 17, 1975, at 7:19 p.m. GMT, Soviet cosmonaut Alexey Leonov and American astronaut Tom Stafford reached across the hatches of their docked Soyuz and Apollo spacecrafts and shook hands 140 miles above Earth. (Source: NASA)

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Space Shuttle Atlantis docked to Space Station Mir during STS-71. This photo was taken from a temporarily undocked Soyuz spacecraft, while Atlantis prepared to take Norm Thagard and his two Russian Mir crewmates home, following the historic first joint U.S.–Russian long-duration mission. (Source: Roscosmos)

Combined Manna ...

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