Spacewalkers to tackle leak at space station

Cape Canaveral: Two astronauts will venture
outside the International Space Station on Saturday
to tackle an ammonia leak in the power cooling
system.
The leak was discovered Thursday and the repair
job was quickly planned for the weekend.
Spacewalks usually aren't done on such short
notice. But NASA wanted to try to fix the leak
before all the ammonia escaped. The space agency
also wanted to take advantage of a veteran
spacewalker who is due to return home on Monday
with two other astronauts.
The two spacewalkers - Americans Chris Cassidy
and Tom Marshburn - will swap out a pump box on
one of the eight solar panels that supply electricity
to the station.
NASA says the station has plenty of power, and the
six-man crew is not in danger.