Keith Cooper is a freelance science journalist and editor in the United Kingdom, and has a degree in physics and astrophysics from the University of Manchester.
The near-Earth asteroid Bennu displayed signs of outgassing not visible from Earth but detectable when viewed from close-up by NASA's OSIRIS-REx spacecraft.
The findings solidify an earlier theory dating back to the 1980s that predicts there's a lot of water ice buried beneath the surface of objects in the asteroid belt. NASA's, both of which are the main asteroid belt.
The lifetime of objects that orbit near Earth is only about 10 million years before gravitational forces scatter them into the sun, toward Jupiter or into a planet. So dark comets must be being constantly replenished with fresh objects from the asteroid belt to maintain the current numbers near Earth.
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