STS109-E-5236 (4 March 2002) --- Astronauts Richard M. (Rick) Linnehan, mission specialist, waves to crewmates inside the Space Shuttle Columbia's crew cabin as he participates in one of his assigned STS-109 space walks to perform work on the Hubble Space Telescope (HST). Astronauts Linnehan and John M. Grunsfeld, payload commander, went on to replace the giant telescope’s starboard solar array. Their seven-hour space walk ended at 7:38 a.m. (CST) or 13:38 GMT March 4, 2002.