HOW TO PUT A HUMMAN ON MARS

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One of Earth's closest neighbours, Mars is still some 56 million km away at its closest alignment, a journey of at least nine months. Rovers have landed on the Red Planet, probes have scanned its surface but what would it take to put a human on Mars? The BBC asked scientists from Imperial College London to design a mission which could take astronauts to the planet - and back. Watch the videos and explore this interactive to find out about their radical solution.