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Page last updated at 17:02 GMT, Wednesday, 10 June 2009 18:02 UK

How Earth could collide with Mars

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Astronomers have calculated that there is a tiny chance that Mars or Venus could collide with Earth - though it would not happen for at least a billion years.

The prediction comes from simulations to show how orbits of planets might evolve billions of years into the future.

BBC science correspondent Pallab Ghosh explains how the collision could occur.

Animation courtesy of IMCCE-CNRS

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