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Page last updated at 09:00 GMT, Monday, 28 December 2009

Alien search 'should be widened'

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Do you believe that aliens exist? Today's guest editor, Martin Rees, has a great interest in the subject, and asked us to talk to Paul Davies, a distinguished British scientist and chair of the Post-Detection Science and Technology Taskgroup at the International Academy of Astronautics. Professor Davies discusses evidence of intelligent life beyond earth.

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