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First of the three spacewalks on ISS successful

First of the three spacewalks on ISS successful
Two Discovery shuttle crew members, Robert Curbeam and Christer Fuglesang, spent more than six hours in outer space, clearing the way for a critical power rewiring later this week.

The first of three spacewalks began hours after engineers said Discovery's heat shield did not need any further inspection.

A 2-ton girder-like structure installed by the astronauts will act as a backbone for the ISS.

Discovery is now docked to the International Space Station.

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