In 1973, the first Skylab crew of astronauts splashed down safely after a then record 28 days in space. The Skylab was a manned, orbiting spacecraft composed of five parts: the Apollo telescope mount was a solar observatory, the multiple docking adapter, the airlock module, the instrument unit, and the orbital workshop. The Skylab itself was launched on 14 May 1973. It was first manned during the period 25 May to 22 Jun 1973, by the crew of the SL-2 mission. Next, it was manned during the period Jul 28 to 5 Sep 1973 and the final manned period was from 16 Nov 1973 - 8 Feb 1974. The crew quarters contained provisions and supplies necessary to support three-person crews for periods of up to 84 days each.