Nightly News | December 11, 2013
>> we heard about an urgent situation aboard the international space station at this moment. what do we know?
>> reporter: nasa saying there is a situation on the orbiting space station that's urgent but not an emergency. it may require a space walk within the next one or two weeks for a repair. one of two cooling stations stopped working. engineers believe there is a problem with the flow control valve. they are turning off nonessential equipment and rerouting critical systems to another cooling loop. so far all external equipment seems to be working fine. the question is if they can fix it with a software watch or if they will need a space walk . on board now, three russians, two americans, one japanese astronaut. space walks haven't been allowed since an italian autalitalian astronaut's helmet filled with water in july during a space walk .
>> sounds dramatic. all right. thank you very much, tom costello.