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Here's what could happen if asteroid Bennu smashes into Earth in 157 years

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75% Informative

The findings were modeled on near- Earth asteroid Bennu , considered by NASA to pose the highest risk to Earth .

The asteroid measures 0.31 miles ( 0.5 kilometers ) in diameter and weighs an estimated 74 million tons ( 67 million metric tons ) Bennu is significantly smaller than the 6-mile -wide ( 10 km ) behemoth that created the Chixulub crater and wiped out the dinosaurs about 66 million years ago .