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October 28, 2011
Astronauts Michael Good (left) and Mike Massimino, both STS-125 mission specialists, participate in the mission's fourth session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the eight-hour, two-minute spacewalk, Massimino and Good continued repairs and improvements to the Space Telescope Imaging Spectrograph (STIS) that will extend the Hubble's life into the next decade.

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