Created: 12/24/2013 8:03 AM KAALtv.com
CAPE CANAVERAL, Fla. (AP) - For the second time in NASA history, a Christmas Eve spacewalk has begun with a pair of astronauts hoping to give their comrades on the International Space Station a fully operational cooling system for Christmas.
Astronauts Rick Mastracchio and Michael Hopkins are installing a new ammonia pump.
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