NASA is looking into a problem on the International Space Station after a valve on a cooling pump shut down. The pump had hit its temperature limit. The six astronauts are currently not in danger.
Yesterday NASA discovered a pump -- designed to keep equipment cool -- was producing too much ammonia. They shut down some equipment while they investigate, but the station's life support system is still up and running.
A NASA spokesperson says this *could* become a serious problem. They're working to figure out if the astronauts will need to do a spacewalk to fix the broken valve.