STS-126 was a Space Shuttle mission to the International Space Station (ISS) flown by Space Shuttle Endeavour. The purpose of the mission, referred to as ULF2 by the ISS program, was to deliver equipment and supplies to the station, to service the Solar Alpha Rotary Joints (SARJ), and repair the problem in the starboard SARJ that had limited its use since STS-120.
Low Earth OrbitIt was announced that the two satellites had a design life of at least two years, and would be used to probe the space environment, radiation and its effects, record space physical environment parameters, and conduct other related space experiments.
Low Earth Orbit