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Although Atlantis had enough suppliesAlthough Atlantis had enough supplies to remain in space until Monday, NASA did not want to cut it that close.The astronauts have left behind a refurbished Hubble that scientists say is better than ever and should keep churning out pictures of the universe for another five to 10 years. They carried out five spacewalks to give the 19-year-old observatory new science instruments, pointing devices and batteries, and fix a pair of broken instruments, something never before attempted. Stuck bolts and other difficulties made much of the work harder than expected.The $1 billion overhaul was the last for Hubble and, thanks to the crew's valiant effort, won praise from President Barack Obama and members of Congress But with space shuttles retiring next year, no more astronauts will visit the telescope, and NASA expects to steer it into the Pacific sometime in the early 2020s.