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Guides: Aliens

Last Updated: Monday June 27 2005 15:29 GMT

Is there life on other planets?

For years we Earthlings have wondered whether we are alone in the universe or whether we've got company in the shape of aliens.

People have claimed to have met aliens, seen UFOs - unidentified flying objects - and some people even say they've been abducted by extra terrestrials.

But what do we really know about them - if they exist at all?

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