Astronauts begin International Space Station repairs
22 December 2013 Last updated at 02:03 GMT
Astronauts at the International Space Station have completed the first of a series of spacewalks to carry out urgent repairs.
Two Americans astronauts conducted the first of three possible spacewalks needed to mend the station's critical cooling system - half of which automatically shut down last week after detecting abnormal temperatures.
Nasa said the situation was potentially serious but not life-threatening.
Denise Hammick reports.