U.S. space exploration history on U.S. stamps also the only space station NASA launched alone. The 100-ton space station was in Earth's orbit from 1973 to 1979 and it was visited by crews three times in 1973 and 1974. Circling 50 degrees north and south of the equator at an altitude of , Skylab had an orbital period of 93 minutes. There were a plethora of UV astronomy experiments done during the Skylab lifetime, as well as detailed X-ray studies of the Sun. The station was active until July 11, 1979, when it fell out of orbit. The 10-cent Skylab commemorative stamp first day of release took
Space burial cremated remains into space and returned them to Earth. The first private space burial, Celestis' "Earthview 01: The Founders Flight", was launched on April 21, 1997. An aircraft, departing from the Canary Islands, carried a Pegasus rocket containing samples of the remains of 24 people to an altitude of 11 km (38,000 ft) above the Atlantic Ocean. The rocket then carried the remains into an elliptical orbit with an apogee of and a perigee of , orbiting the Earth once every 96 minutes until reentry on May 20, 2002, northeast of Australia. Famous people on this flight included Gene Roddenberry