InfoAnda - Spacewalkers give Hubble new lease on life

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Yahoo! My Yahoo! Mail Yahoo! Search Search: Sign InNew User? Sign Up News Home - Help Navigation Primary Navigation Home Singapore Asia Pacific World Business Entertainment Sports Technology Top Stories Most Popular Secondary Navigation Search Search: Spacewalkers give Hubble new lease on life AFP - Tuesday, May 19 HOUSTON, Texas (AFP) - - Spacewalking astronauts from the shuttle Atlantis finished their ambitious overhaul of the Hubble Space Telescope with a sentimental final outing that left nothing on their mission's wishlist unfulfilled. ADVERTISEMENT The refurbished 19-year-old observatory, which the crew of the shuttle Atlantis hauled into the ship's payload bay last week, will be released into space with the shuttle's robot arm at 1253 GMT Tuesday. The shuttle crew equipped Hubble for at least five more years of observations, and there are no plans for further human interaction with the iconic observatory. NASA's shuttles, facing retirement by the end of next year, launched the space telescope in 1990. Shuttle crews returned in 1993, 1997, 1999 and 2002 to upgrade the telescope with new science instruments and replace failed parts. "Hubble has returned to flagship status. It now has a full arsenal of instruments and tools for astronomers to make new discoveries," said Jon Morse, NASA's chief astrophysicist. "Our work is just beginning. We have thousands of astronomers around the world waiting to get their data. They are chomping at the bit." The refurbished telescope will undergo three to four months of re-commissioning, a period during which each of the four cameras and spectrographs either installed or repaired by the Atlantis astronauts will be checked-out and re-calibrated before scientists resume their observations. "This is a really tremendous adventure we've been on, a very challenging mission," said John Grunsfeld, the astronomer-turned-astronaut who led three of the shuttle mission's five spacewalks. "Hubble is not just a satellite, it's about humanity's quest for knowledge." To ensure they did all they could for the iconic telescope, Grunsfeld and Feustel started Monday's spacewalk an hour early. The early start gave them time to march through the mission's whole agenda. The lowest priorities included a task that was postponed on Sunday, when fellow spacewalkers Mike Massimino and Mike Good ran into a string of obstacles as they worked to revive Hubble's Space Telescope Imaging Spectrograph. Grunsfeld and Feustel began the final outing by replacing three batteries. Next, they replaced a fine guidance sensor, an optical device that works with the gyros to provide the observatory with precision pointing. As their final task, Grunsfeld and Feustel attached panels of stainless steel shielding to the outside of the telescope, covering blemishes created by the bombardment of solar radiation. Massimino and Good fell behind with that task when they encountered a stripped bolt and other obstacles with a higher priority task on Sunday, the repairs to the Space Telescope Imaging Spectrograph. The spectrograph, which had been inactive for five years, was responding to a round of tests to verify the repair, NASA said. No task seemed of a low priority to Grunsfeld. As he mounted a new stainless steel shielding, the deteriorating material underneath began to flake and float away. "I feel so bad about the debris," said Grunsfeld in a low tone. Tony Ceccacci, NASA's lead flight director for the mission, characterized Monday's spacewalk as bitter as it was sweet for those who have worked in the shuttle program to support Hubble. "It was like a sad day and a very happy day," he said at a news briefing. "It's like you go, this is really over. You really don't know what else to say, but congratulate each other on a super effort." The Atlantis astronauts plan to return to Earth on Friday, landing at NASA's Kennedy Space Center in Florida. After they pull away from Hubble the astronauts will lower the shuttle's altitude, then examine the space craft's heat shield for signs of damage from impacts with space debris and tiny meteoroids. Hubble's 11-day mission carries a higher risk than NASA's usual mission to the international space station because of an accumulation of man made space debris at the telescope's higher altitude. Email Story IM Story Printable View Blog This Sign in to recommend this article » 1 user recommend Enlarge Photo Facts on the Hubble telescope and NASA's latest servicing mission. Atlantis astronauts concluded a fifth and final spacewalk to refurbish the Hubble Space Telescope. Most Popular – Top Stories Viewed Popular cereal is a drug, US food watchdog says Spacewalkers give Hubble new lease on life Coral Triangle could die by century's end: WWF British store admits it boobed in bra row Australian zoo evacuated after orangutan escape View Complete List » Search: Home Singapore Asia Pacific World Business Entertainment Sports Technology Top Stories Most Popular Copyright © 2009 Yahoo! Southeast Asia Pte Ltd. (Co. Reg. No. 199700735D). All Rights Reserved. Privacy Policy - Terms of Service - Community - Intellectual Property Rights Policy - Help

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