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
Cultural impact of Star Wars weeks in orbit, it was brought back to Earth on November 7, 2007, to be returned to its owner George Lucas. The first successfully launched space-rocket, to be sent by the private spaceflight company SpaceX, was named the Falcon 1. Elon Musk used the word "falcon" within the name of the space-rocket, as a reference to the Millennium Falcon from Star Wars. The Falcon 1's success led to the fabrication of updated versions of the space rocket, in what became known as the Falcon family of space-rockets. The Falcon 1 has since been retired, in favor of the Falcon 9.