Soyuz 7

The Soviet Union launches Soyuz 7, intended to be the active partner in a space rendezvous and docking with Soyuz 8 (launched the following day), as the already-launched Soyuz 6 films the docking. When the rendezvous radar gear aboard all three Soyuz vehicles fail to function properly, the docking is aborted. Cosmonauts Anatoly Filipchenko, Vladislav Volkov and Viktor Gorbatko return to Earth after nearly five days in space.