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Astronaut Koichi Wakata is returning to Earth wearing the same underpants he has worn for a month during his space station visit.

The pants are experimental and designed to be odour-free.

As crew on the shuttle Endeavour headed back to Earth, the Japanese astronaut broke the news to his colleagues about the underwear experiment.

He said: "I wore them for about a month, and my station crew members never complained for about a month, so I think the experiment went fine".