Project Skylab utilized hardware developed for the Apollo program to create the first U.S. space station.
Scientific work in Astronomy, Earth Sciences, and Life Sciences were undertaken. Perhaps as significant, the U.S. gained the experience of managing long duration space flights.
Skylab 1: Unmanned laboratory.
Launched: May 14, 1973, Saturn-V rocket.
Served as a space station for 3 crews.
Made an uncontrolled re-entry to the earth's atmosphere in 1979.
Skylab 2: Crew: Charles C. Conrad Jr., Paul J. Weitz, Joseph P. Kerwin
Launched: May 25, 1973 , Saturn-1B rocket.
Re-Entry: June 22, 1973
Skylab 3: Crew: Alan L. Bean, Jack R. Lousma, Owen K. Garriott
Launched: July 28, 1973, Saturn-1B rocket.
Re-Entry: September 25, 1973
Skylab 4: Crew: Gerald P. Carr, William R. Pogue, Edward G. Gibson
Launched: November 16, 1973
Re-Entry: February 8, 1974