ນັກບິນ ອະວະກາດ ປະຕິບັດງານ ນອກ ສະຖານີ ອະວະກາດ

Astronaut Mike Hopkins and Astronaut Rick Mastracchio replace a faulty pump on the International Space Station during a spacewalk, Dec. 24, 2013.

Astronauts Rick Mastracchio, top, and Michael Hopkins work to repair an external cooling line on the International Space Station, Dec. 24, 2013.

Astronaut Mike Hopkins is seen at the end of the robotic arm on the International Space Station during a spacewalk, Dec. 24, 2013.

Astronaut Mike Hopkins works outside the International Space Station during a spacewalk, Dec. 24, 2013.

Astronauts Rick Mastracchio, top, and Michael Hopkins work to repair an external cooling line on the International Space Station, Dec. 24, 2013.

NASA astronaut Mike Hopkins is seen during the spacewalk, received December 22, 2013.

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

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. 

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.

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.

Astronauts 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.