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
Men into Space spacecraft landings on a desert runway. The distinctive design of the North American X-10 (different from the close up depictions of the series spacecraft) can be seen in the desert landing sequences. "Men Into Space" used for its plots many technical and human problems anticipated by engineers and planners. For example, the show depicted attempts to refuel spacecraft by tanker in orbit, construction of a space telescope, an experiment to dispose of high level atomic waste by launching it into the Sun, the search for life-sustaining frozen Lunar water, and exploration and destruction of an asteroid whose orbit threatened Earth.