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Fri 04 Apr 2007Hawking to float in zero-gravity flightUS:For almost four decades, astrophysicist Stephen Hawking has studied black holes, exploding stars and the origin of the universe from the confines of his wheelchair.Last night, the renowned Cambridge professor was taking a bold step of his own by breaking free from the restrictions of his paralysed body and experiencing the weightlessness of space first-hand on a zero-gravity trip over the Atlantic.