CORRECTED - Astronauts tackle last items on Hubble fix-up list
(Corrects day of shuttle's return to Earth to Friday from Thursday in 10th paragraph and crosshead)
* Fifth and final spacewalk begins for shuttle Atlantis
* Hubble Space Telescope to get new batteries
* U.S. space agency says instrument repair was successful
By Irene Klotz
HOUSTON, May 18 (Reuters) - Shuttle Atlantis astronauts returned to the Hubble Space Telescope on Monday for a final spacewalk to install fresh batteries, thermal shields and a sensor to pinpoint celestial targets for research.
Lead spacewalker John Grunsfeld and partner Andrew Feustel left the shuttle's air lock at about 8:30 a.m. EDT (1230 GMT), almost an hour ahead of schedule.
"OK, Drew. Let's go and be productive," Grunsfeld said as they headed out toward Hubble.
Their primary job is to replace three of Hubble's batteries and one of its star-tracking sensors, which are used to aim the observatory at celestial targets. Continued...
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