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[–] carlip ago 

Olympus mons was a martian made launch pad that used the final amount of energy to blast a transport ship to earth. Systems failed just outside the orbit of the moon and the ship crashed into earth, killing all the dinosaurs.

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[–] Le_Squish 0 points 1 point (+1|-0) ago 

I've read some speculation about Mars "dying" because it got 2 catastrophic impacts a few million years too close together. Mars got, I think, got hit 100 million years ago and then also seems to have been hit again when fat rock reset earth.