But now they're home for the holidays -- home at the International Space Station, that is, after a high-stakes repair job clearing the way for reactivation of a critical coolant system.
After a faulty pump for the space station's cooling system goes on the fritz, astronauts must venture outside the station to replace the machine.
The Olympic torch arrived on the International Space Station, but how will it do during a spacewalk?
An impromptu spacewalk triggered by the sight of ammonia flakes drifting past a window of the International Space Station wraps up with a replaced pump and a plan for "additional detective work."
In a virtually trouble-free spacewalk, Russian cosmonauts move a cargo crane from International Space Station module to another, launch a small science satellite, and install debris shields on their command module.
Applying a healthy dose of elbow grease, Douglas Wheelock finally freed a jammed ammonia line connector, clearing the way for removal of a failed coolant system pump.
Faced with an unexpected ammonia leak, NASA engineers revise plans for replacing a coolant system pump aboard the International Space Station.
NASA is racing the clock to iron out plans for two quick-response spacewalks to replace a critical coolant system pump aboard the International Space Station.
Multiple alarms woke the space station's crew late Saturday after one of two coolant loops shut down, forcing the astronauts to power down critical systems. Two spacewalks are being planned to fix the problem.
A problem with the carbon dioxide removal system in astronaut Chris Cassidy's spacesuit forces flight controllers to terminate a space station battery replacement spacewalk.