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?
NASA reports are all crew members are currently safe in the Russian section of the ISS, but work to determine the cause of the alarm is ongoing.
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."
ESA astronaut Alexander Gerst has been silently drifting through the ISS while his colleagues sleep, photographing the eerie atmosphere.
After numerous delays, the space transport company sends its Falcon 9 rocket and Dragon spacecraft into orbit to carry cargo to the International Space Station. Next up: get that rocket back.
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.
Two cosmonauts pass the Olympic torch during a spacewalk outside the International Space Station as it orbits some 260 miles above Earth.
Astronaut Karen Nyberg demonstrates her techniques for personal hygiene from the neck up aboard the International Space Station.