* Astronomy

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RE: STS-125 mission

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U.S. astronauts have completed the fourth in a series of five spacewalks to repair the Hubble Space Telescope.
Astronauts Mike Good and Mike Massimino on Sunday replaced the power supply unit for the Space Telescope Imaging Spectrograph, a powerful instrument that allows NASA to identify black holes and to monitor galaxies.

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Atlantis astronauts Mike Massimino and Mike Good have begun the fourth of five spacewalks during the final mission to repair the Hubble Space Telescope.
The two 46-year-olds, paring up for the second time, switched on their spacesuit battery power at 9:45 a.m. EDT, after completing more than 90 steps needed to get started.

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Spacewalkers' specially designed tools couldn't dislodge a balky bolt interfering with repairs Sunday at the Hubble Space Telescope, so they took an approach more familiar to people puttering around down on Earth: brute force.

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Hubble's new spectrograph fitted
Astronauts upgrading the Hubble Space Telescope have made a third spacewalk in as many days to make repairs deep inside the orbiting observatory.

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Atlantis Astronauts float out on first Hubble spacewalk

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A pair of astronauts swapped out an old camera on the Hubble Space Telescope on Thursday, during a delicate spacewalk made all the more dangerous because of the high, debris-ridden orbit.

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The Atlantis astronauts captured NASA's Hubble Space Telescope some 350 miles above the planet today during a high-flying rendezvous that set the stage for five spacewalks coming up on consecutive days.

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Shuttle Atlantis and its crew moved toward the Hubble Space Telescope for a 350-mile-high grab Wednesday that will set the stage for five days of formidable spacewalking repairs.

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Space shuttle Atlantis is now in a rough orbital neighbourhood - a place littered with thousands of pieces of space junk zipping around the Earth at nearly 20,000 mph. There are more pieces of shattered satellites and used-up rockets in this region than astronauts have ever encountered. And the crew must be there for more than a week to repair the Hubble Space Telescope. As soon as the job is complete, the shuttle will scamper to safety.

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