Astronauts step out for longest, hardest spacewalk
November 22nd, 2008 in Space & Earth / Space Exploration
In this image provided by NASA astronaut Shane Kimbrough participates in the mission's second scheduled session of extravehicular activity Thursday Nov. 20, 2008 as construction and maintenance continue on the International Space Station. (AP Photo/NASA)
(AP) -- Astronauts stepped out for the longest and hardest spacewalk of their mission Saturday to wrap up greasy repair work on a gummed-up joint at the international space station.
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