SPACE SHUTTLE- NASA still struggling with stuck valve in space

SPACE SHUTTLE
NASA still struggling with stuck valve in space

CAPE CANAVERAL, Fla. (AP) - Flight controllers today struggled
to open a stuck valve in a cooling loop at the International Space
Station.
The 13 orbiting astronauts are getting a little time off after
an intense week of hauling supplies and swapping tanks.
Mission Control in Houston tried twice, without success, to
command the nitrogen valve by remote control to open. Nitrogen is
needed to pressurize the ammonia coolant.
For now, the space station is being cooled properly. But the
valve needs to be opened in the coming days - or the entire
nitrogen unit replaced in a spacewalk. Otherwise, half of the
station's electronics may have to be turned off.
Discovery and its seven astronauts are due to leave Saturday.
Meanwhile, President Barack Obama tomorrow heads for Kennedy
Space Center to deliver a speech outlining NASA's future in
exploration.


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