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
Earth Orbit Stations the title two-plus stars of five, calling it "An interesting failure ... the logistics just are not that much fun". "Compute!" reviewed the game more favorably, stating that ""EOS" offers a level of challenge unusual in space-related software. To succeed at this game requires careful thought". Earth Orbit Stations E.O.S.: Earth Orbit Stations is a space station management simulation game developed by Karl Buiter, with Joe Ybarra as producer, for Electronic Arts. It was released for the Commodore 64 and Apple II in 1987. The game focuses on both the material and economic challenges of building a permanent, fully functioning