Every day, Earth is bombarded with hundreds of tons of small objects.
— left the 99-mile-wide Vredefort crater in what is now South Africa. Because that impactor struck the planet 2 billion years ago, however, most of the crater and the evidence of its destructive force have eroded. Despite representing potentially the single largest energy-release event in Earth's history, the asteroid impact left behind no signs of the forest fires and mass extinctions that accompanied the dino-killing asteroid.
's DART mission tested a kinetic impactor by slamming a spacecraft into a small asteroid and monitoring the disruption in its movements.Another hypothetical way to prevent a collision is a"gravity tractor," a spacecraft that could alter a PHO's course using the weak force of gravity. intended toby using the mass of a spacecraft to attract an asteroid, relocating some of its material into orbit around the moon. The Asteroid Redirect Mission was meant to test gravity tractors, provide samples of asteroid composition and support
's eventual crewed missions to
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