Two American astronauts have successfully repaired a crippled cooling system during a rare Christmas Eve spacewalk.
It was the second spacewalk in less than a week for astronauts Rick Mastracchio and Mike Hopkins, and only the second Christmas Eve spacewalk ever performed.
NASA ordered the spacewalks to revive a critical cooling loop at the International Space Station and install a new pump.
All non-essential equipment had to be turned off when the line died on December 11, and many experiments were halted.
NASA said the seven-hour spacewalk was a success, and the cooling system should be restored and all equipment back up and running soon.
Two Russian cosmonauts are scheduled for a spacewalk Friday to install new cameras.