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Astronauts tackle space station leak

CAPE CANAVERAL, Fla. — Two astronauts worked on a leaky radiator system outside the International Space Station on Thursday, hours after dodging orbiting junk.

NASA ordered the space station to change position Wednesday to avoid a fragment from a communication satellite. Space station commander Sunita Williams and Japanese astronaut Akihiko Hoshide rerouted ammonia coolant lines and bypassed a radiator thought to be leaking.

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Engineers theorize that space junk may have penetrated the radiator. The radiators are needed to dissipate heat generated by electronics.

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