NASA has waved off today's planned landing of space shuttle Discovery due to cloud and rain at Kennedy Space Center.

Discovery's STS-131 mission to the International Space Station will now end tomorrow, either at Kennedy or Edwards Air Force Base. The first Kennedy landing opportunity is at 12:33 GMT.

STS-131 saw specialists Clayton Anderson and Rick Mastracchio complete three spacewalks, during which they replaced an Ammonia Tank Assembly which forms part of the orbiting outpost's cooling system. ®

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