Rick Mastracchio and Mike Hopkins removed a faulty ammonia pump Saturday, December 21 while working outside the orbiter for more than five hours.
ນັກເຫາະອາວະກາດ ອອກໄປຊ່ອມແປງ ຢູ່ນອກສະຖານີ

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In this image made from video provided by NASA, astronaut Rick Mastracchio performs a space walk outside the International Space Station, Dec. 21, 2013.

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Astronaut Rick Mastracchio (L) checks out the spacesuit that he will wear during a spacewalk with crew member Mike Hopkins at the International Space Station in this undated image taken from video from NASA TV.

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Astronaut Mike Hopkins checks out the spacesuit he will be wearing on a spacewalk at the International Space Station, in this undated handout photo from NASA.

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Flight engineers Michael Hopkins and Rick Mastracchio perform a series of spacewalks outside the International Space Station in this Dec. 21, 2013 still image taken from a NASA handout video.