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Dinosaur-killing asteroid was likely a giant mudball, study says

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An asteroid collided with what’s now the Yucatán Peninsula in Chicxulub , Mexico , 66 million years ago .

The impact created a cloud of dust composed of the asteroid itself and the rock it landed on.

The asteroid was likely between 6 and 9 miles ( 9.7 and 14.5 kilometers ) in diameter.

The discovery “adds richness to our understanding of what happened” when dinosaurs went extinct, a professor says.

Knowing how different types of asteroids interact with the physical forces around them would be critical for an effective planetary defense operation, he says.

Goderis cited the 2022 DART mission, or the Double Asteroid Redirection Test , in which NASA sent a spacecraft to intentionally knock an asteroid off its course.