Artificial
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If an asteroid is large enough ( 20 + miles across ) most life on earth would be gone within a few months.
However, even an asteroid is not large enough to destroy the Earth, life yes, but not the Earth. To destroy the Earth it would need something larger than the planet Mars.
Read more: http://wiki.answers.com/Q/Can_a_meteor_destroy_The_Earth#ixzz1MqwhqMWB