OSIRIS-REx Samples Bennu's Surface

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Astronomy.com

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Science

Bennu isn't likely to hit Earth - but if it did, here's what would happen

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Asteroid 101955 Bennu has a 1-in-2,700 chance of hitting Earth in 2182 .

Worst case scenario showed that Bennu would inject about 400 million tons of dust into our atmosphere, causing a global cooling event of roughly 7 degrees Fahrenheit ( 4 degrees Celsius ) Global rainfall would drop by 15 percent , with plant photosynthesis taking a 20 percent to 30 percent nosedive after impact.

But plankton in the ocean recovers within 6 months and even increases afterward.

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