Sandra Bullock in Gravity
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Astronaut helps Sandra Bullock prepare for space film

The 3D thriller Gravity - starring George Clooney and Sandra Bullock - is released in the States this week, and will be out in the UK in November.

The movie has already received critical acclaim, with director James Cameron describing it as the "best space film ever done."

But perhaps the film's success is partly down to Nasa astronaut Cady Coleman - who helped Sandra Bullock to understand what life in space is like.

Cady told BBC Radio 5 live's Up All Night: "She was trying to understand about moving, and also just the sort of feeling of what it's like to be up there... so far away from everyone you love."

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