克里斯哈德菲爾德在地球上, 火星和太空失明 | 監護人直播

Chris Hadfield, the Canadian astronaut talks to Guardian science editor Ian Sample about flying to Mars, going blind in space and his first view of the Earth.
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Commander Hadfield was speaking at a Guardian Live event at the Royal Geographic Society in December 2014. Find out about upcoming Guardian Live events and debates and how to sign up as a member.
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