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Vetteman94 said:
I'll go with nuclear holocaust, too many nukes in this world just waiting to be fired at someone.

To end the world? You would need a lot of them. Wipe out life yes, easily. But to destroy the entire planet, I can't see that happening I'm afraid.

OT: I think it would be either engulfed by the sun as it ages and the becomes a giant star, or a super collision of some variety.