Skylab 2
Skylab 2 was launched in 1973. This first manned mission to Skylab circled the earth for 28 days while astronauts Pete Conrad, Joseph Kerwin, and Paul Weitz made repairs to Skylab and conducted 392 hours of experiments. At that time, the crew held the record for longest time in space. They successfully returned to earth on July 22, 1973. Children could learn more at: Skylab 2.