STS-51G Discovery (June 17 to June 24, 1985) was a 7-day mission, during which the crew deployed communications satellites for Mexico (Morelos), the Arab League (Arabsat) and the United States (AT&T Telstar). They used the Remote Manipulator System (RMS) to deploy and later retrieve the SPARTAN satellite, which performed 17 hours of x-ray astronomy experiments while separated from the Space Shuttle. In addition, the crew activated the Automated Directional Solidification Furnace (ADSF), six Getaway Specials and participated in biomedical experiments. The mission was accomplished in 112 orbits of the Earth, traveling 2.5 million miles in 169 hours and 39 minutes. Landing was at Edwards Air Force Base (EAFB), California.