The mission of the US space shuttle, Endeavour, has been extended by one day because of problems with a new system on the International Space Station.
Nasa said it wanted to give astronauts more time to repair a machine designed to convert urine into drinking water.
The equipment has failed several times since it was delivered a week ago.
Astronauts Stephen Bowen and Shane Kimbrough conducted on a fourth and final spacewalk on Monday to repair the bearings of the space station's solar array.
One-Minute World News 
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