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The zero-gravity of space is simulated by flying a series of parabolic flight manoeuvres that counter the forces of gravity and allow astronauts and cosmonauts to learn how to accomplish tasks with no gravity. Â鶹Éç Reporter, Martin Redfern, tries out ‘zero gravity’ in a parabolic flight. Originally broadcast on 28 May, 2009. (Photo Credit: MEHDI FEDOUACH/AFP/Getty Images)