Dinosaur-killing asteroid impact fouled Earth's atmosphere with dust

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Halifax District RCMP Seek Public Assistance to Identify Driver | SaltWireWASHINGTON - It was, to put it mildly, a bad day on Earth when an asteroid smacked Mexico's Yucatan Peninsula 66 million years ago, causing a global calamity that erased three-quarters of the world's species and ended the age of dinosaurs.

The total amount of dust, they calculated, was about 2,000 gigatonnes - exceeding 11 times the weight of Mt. Everest. While prior research highlighted two other factors - sulfur released after the impact and soot from the wildfires - this study indicated dust played a larger role than previously known.

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