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 o...

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.