Commander Chris Hadfield tweeted from space this morning that the crew of the International Space Station (ISS) is planning a spacewalk to fix an ammonia leak in a critical cooling system.
NASA said the crew is not in danger, but the coolant is expected to run out sometime today. Since the cooling system affects one of eight solar arrays that provide power to the ISS, NASA must reroute power sources to keep all systems fully functional.
This comes at a somewhat inconvenient time for the astronauts on the ISS. Three crew members, including Hadfield, are scheduled to return to Earth Monday after a five-month stint aboard the station. The leak is not expected to affect the undocking process.