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Hubble Telescope to Get Final House Call

The Hubble Space Telescope is about to get one last house call. And never before have the risks been higher.

On Monday, astronauts will rocket away to the most famous telescope of modern times. They'll be taking up new scientific instruments, replacement parts for broken cameras and fresh batteries that should keep Hubble running for five to 10 years.

This cosmic-scale grand finale -- stalled seven months by a telescope breakdown -- will be NASA's most daring overhaul yet of the 19-year-old orbiting observatory, a captivating, twinkling jewel in the sky representing $10 billion of investment.

Never before have spacewalking astronauts attempted to fix dead science instruments on the Hubble, equipment that was never meant to be handled in orbit. Before they've just swapped out the whole thing at the telescope, which started out life shockingly nearsighted.

In all, five spacewalks will be performed in as many days by two repair teams. Two of the repairmen have visited Hubble before and, because of that, were chosen for this extraordinarily difficult job, on a par with operating-room surgery.

"Hubble needs a hug," said the chief repairman, John Grunsfeld, who will be making his third trip to the telescope.

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