NASA astronauts began their fourth spacewalk this morning to continue their efforts to repair and improve the Hubble Space Telescope. The astronauts began at 9:45 am EDT and was expected to last at least 7 hours.nnMost of today's spacewalk was used to work on the telescopes, STIS or Space Telescope Imaging Spectrograph. The two spacewalkers, Mike Massimino and Mike Good also replaced a low-voltage power supply board which contained a failed power convert and because of this failed component, STIS has been in "safe mode" since August of 2004.n
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