STS109-E-5243 (4 March 2002) --- Astronauts Richard M. (Rick) Linnehan (top), mission specialist, and John M. Grunsfeld (partially obscured at center frame) participate in the first of their assigned STS-109 space walks to perform work on the Hubble Space Telescope (HST). The two 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.