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
Politics of the International Space Station traveler and he returned to Earth safely. Pontes trained on the Space Shuttle and Soyuz, but ended up going up with the Russians, although he did work at the U.S. Johnson Space Center after returning to Earth. Politics of the International Space Station Politics of the International Space Station begins with the 1972 milestone in co-operation between the United States and the Soviet Union in space, the Apollo-Soyuz Test Project. This cooperative venture resulted in the July 1975 docking of Soyuz 19 with an Apollo spacecraft. From 1978 to 1987, the USSR's Interkosmos programme included allied Warsaw Pact countries, and