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
Buzz Aldrin's Race Into Space is also a "basic" model in the game which equalizes costs and safety factors between both sides. Despite this, "BARIS" still features most of the major pieces of hardware and approaches to Moon landing that were considered, including lunar orbit rendezvous (which was the strategy used successfully in Project Apollo), Earth orbit rendezvous and direct ascent. Buzz Aldrin's Race Into Space Buzz Aldrin's Race Into Space, frequently abbreviated BARIS, is a space simulation strategy game for MS-DOS. The player takes the role of Administrator of NASA or head of the Soviet space program with the ultimate goal of being the