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CAPE CANAVERAL, Florida (AP) -- Atlantis' astronauts headed out for another spacewalk Friday, this time to give the Hubble Space Telescope some new, badly needed gyroscopes and batteries. Replacing Hubble's gyroscopes is the top priority for this final repair mission to the 19-year-old observatory. The gyroscopes are part of the telescope pointing system, and half of the old ones are broken. It was the second spacewalk in as many days for the Atlantis astronauts. On Thursday, another two-man team installed a powerful new camera and a computer data unit, after struggling with a stubborn bolt. NASA hoped for an easier, less stressful spacewalk Friday. In all, five spacewalks are planned so that the observatory -- beloved by astronomers and many others for its breathtaking views of the universe -- is at its apex while living out its remaining years. (16 images)

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Astronauts John Grunsfeld, left, and Andew Feustel working on the Hubble Space Telescope during the first of five STS-125 spacewalks on Thursday, May 14. NASA


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Astronaut John Grunsfeld performs a spacewalk on Thursday, May 14, to work on the Hubble Space Telescope. The reflection in his helmet visor shows astronaut Andrew Feustel taking the photo while perched on the end of the remote manipulator system arm. NASA



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This image provided by NASA shows a high oblique scene looking toward the Red Sea, Sinai Peninsula and the Mediterranean Sea. Saudi Arabia is in the foreground and Egypt's Nile River and its delta can be seen (left) toward the horizon. Israel and Jordan can be seen near the top edge of the frame. The Gulf of Suez and the Gulf of Aqaba (near frame center) extend from the Red Sea, bottom, toward the Mediterranean Sea. The image is among the first group of still images downlinked Tuesday May 12, by the crewmembers onboard the Space Shuttle Atlantis enroute to the Hubble Space Telescope. NASA



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This image taken from the ground using a telescope with a solar filter shows the NASA space shuttle Atlantis in silhouette during solar transit, Tuesday, May 12, from Florida. This image was made before Atlantis and the crew of STS-125 had grappled the Hubble Space Telescope. NASA / Thierry Legault



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Astronaut John Grunsfeld performs a spacewalk to work on the Hubble Space Telescope on Thursday, May 14. NASA



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Astronaut Andrew Feustel, mission specialist, performs work on the Hubble Space Telescope as the first of five STS-125 spacewalks kicks off a week's work on the orbiting observatory. Feustel, teamed with astronaut John Grunsfeld, arm is visible at bottom frame, will join the veteran spacewalker on two of the remaining four sessions of extravehicular activity later in the mission. NASA



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Astronaut Andrew Feustel, mission specialist, performs work on the Hubble Space Telescope as the first of five STS-125 spacewalks kicks off a week's work on the orbiting observatory. The shuttle is perched on the end of the Canadian-built remote manipulator system. Feustel, teamed with astronaut John Grunsfeld, not pictured, will join the veteran spacewalker on two of the remaining four sessions of extravehicular activity later in the mission. NASA



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STS-125 mission specialist Michael Good is busy on Atlantis' middeck during his second day in space, May 13,. The mission promises to be very busy for the entire crew, as five spacewalks, two of which will have Good leaving the shirt-sleeved environment of the shuttle to perform work on the Hubble Space Telescope, are in the offing. Fellow astronaut Mike Massimino is in the foreground. NASA



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The Hubble Space Telescope in the cargo bay of the Space Shuttle Atlantis following its capture and lock-down in Earth orbit Wedneseday, May 13. NASA



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The Hubble Space Telescope as seen from the Space Shuttle Atlantis as the two spacecraft approached each other in Earth's orbit Wednesday, May 13. NASA



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The Hubble Space Telescope following the grapple of the observatory by the shuttle's remote manipulator system Wednesday, May 13. NASA



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The Hubble Space Telescope following the grapple of the observatory by the shuttle's remote manipulator system Wednesday, May 13. NASA



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The Hubble Space Telescope following the grapple of the observatory by the shuttle's remote manipulator system Wednesday, May 13. NASA



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The space shuttle Atlantis lifts off May 11, at Kennedy Space Center in Florida on the final shuttle mission to service NASA's Hubble Space Telescope. At right on Pad 39A sits shuttle Endeavour which would be launched as a rescue mission in the event the Atlantis is damaged on launch. AFP / Getty Images / Stan Honda



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The media photographs the space shuttle Atlantis as it lifts off May 11, at Kennedy Space Center in Florida on the final shuttle mission to service NASA's Hubble Space Telescope. AFP / Getty Images / Stan Honda



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Ryan Eddleman, alongside with hundreds of other people, waits to watch the space shuttle launch, near Veterans Park in Titusville, Fla. Monday, May 11, on a mission to repair the Hubble telescope. AP / J Pat Carter



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