Photo: "Dinosaur Killer" Asteroid Only One Part of New Quadruple-Whammy Theory

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An artist's conception shows the massive Chicxulub asteroid impact many scientists think wiped out the dinosaurs 65 million years ago. But new evidence adds support to theories that a "quadruple whammy" of climate change, massive volcanism, and two major collisions all contributed to the mass extinction.

Image courtesy NASA

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