How big is the asteroid threat, really?


Is our solar system really a shooting gallery, with Earth as a target for asteroids? As humanity prepares for its first-ever planetary defense practice mission, NASA officials recently reassured Earthlings that they have very little to worry about. The Double Asteroid Redirection Test (DART), which will slam a probe into an asteroid moonlet called Didymos on Sept. 27 to try to change its orbit a...

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