" As the world below watched their every move via a live-stream video link from Nasa's mission control in Houston, Texas, American flight engineers Tom Marshburn and Chris Cassidy left the space station through its airlock and began their painstaking work. Their task was to stop ammonia leaking from the cooling system of one of the eight solar panel arrays that provides electricity to the station, which is currently home to three astronauts and three Russian cosmonauts."


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