'Gravity' is already earning plaudits and Oscar buzz, with its depiction of survival - alone - in outer space. Sandra Bullock and George Clooney star in this jaw-dropping thriller, but how true to life is it? Director Alfonso Cuaron describes the challenge of filming in the void, while two real-life astronauts lend their views on how well he's succeeded... ('Gravity' is in UK cinemas from 8 November).
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