Astronauts embark on first spacewalk of mission at int'l space station

September 2, 2009 01:19

Two astronauts stepped out on a spacewalk at the international space station on Tuesday evening. The first spacewalk of the mission got under way shortly after the space station received a new $5 million treadmill. The treadmill is named after TV comedian Stephen Colbert, who was out of the country Tuesday. But he said through his New York publicist that he was proud his treadmill would be used "to help trim down those famously fat astronauts." Spacewalkers Nicole Stott and Danny Olivas will remove an old ammonia tank from the space station. A new, fully loaded tank will be installed during another spacewalk Thursday as part of the cooling system. In all, three spacewalks are planned during shuttle Discovery's visit.

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