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How many scary asteroids really go past Earth every year?

phys.org 'City killers' and half-giraffes: How many scary asteroids really go past Earth every year?

Asteroids are chunks of rock left over from the formation of our solar system. Approximately half a billion asteroids with sizes greater than four meters in diameter orbit the sun, traveling through our solar system at speeds up to about 30 kilometers per second—about the same speed as Earth.

'City killers' and half-giraffes: How many scary asteroids really go past Earth every year?

What are the risks, by the numbers? How many asteroids hit Earth and how many can we expect to zip past us?

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