Scientists say the dinosaur-killing asteroid may have broiled Earth’s surface when hot debris and fine dust rained back through the atmosphere

When an asteroid roughly six miles wide slammed into what is now Mexico's Yucatán Peninsula 66 million years ago, the impact itself was only the beginning. The American Geophysical Union suggests the debris that the impact threw into the sky came raining back down with enough force to cook the planet's surface, delivering a second, deadlier punch on top of the collision itself.

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