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
![In this image made from video provided by NASA, astronaut Rick Mastracchio performs a space walk outside the International Space Station, Dec. 21, 2013. ](https://gdb.voanews.com/5f7468bb-5e4a-416c-a2f3-f3a49c4eb3a4_w1024_q10_s.jpg)
໑
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. ](https://gdb.voanews.com/dc3db04c-a0a2-4008-a49b-6e9fdbfc087e_w1024_q10_s.jpg)
໒
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.](https://gdb.voanews.com/89300c91-643e-464f-ab88-07d0e390f603_w1024_q10_s.jpg)
໓
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.](https://gdb.voanews.com/de2bb302-678b-49eb-9cee-74f77c874fff_w1024_q10_s.jpg)
໔
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.