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Page last updated at 07:55 GMT, Monday, 28 December 2009

The future of space exploration

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Private and commercial services should be used to launch astronauts into space, according to a US committee looking at the future of human space flight. Today's guest editor, the Astronomer Royal Martin Rees and Dr Christopher Chyba, an adviser to President Obama and a member of the US committee, investigate the future of human space exploration.

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