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Astronauts Completes Sixth Longest Spacewalk in History

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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