16 of 21: In this photo provided by NASA, astronaut John Grunsfeld, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis' remote manipulator system (RMS), participates in the mission's fifth and final session of extravehicular activity (EVA) to refurbish and upgrade the Hubble Space Telescope on Monday May 18, 2009. The last humans to lay hands on Hubble outfitted the observatory with another set of fresh batteries, a new sensor for precise pointing and protective covers. That equipment, along with other improvements made over the last five days, should allow the telescope to provide views of the universe for another five to 10 years.

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