A conference entitled Is There Anybody Out There, being organised by the Royal Society, is to debate how we handle "first contact" with alien races.
The discovery in recent years of hundreds of planets orbiting far off stars has brought the prospect of finding life elsewhere in the universe tantalisingly close.
Science correspondent Tom Feilden reports on the progress in the search for extra terrestrial life and Professor Albert Harrison explains how we should react if alien life is found.
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