“Dark Comets” Are Out There, too

Along with rogue planets, near-Earth asteroids, and blazing comets, there are also “dark comets” now to worry about. They are like asteroids in that they are small and dark and hard to spot. Like comets, they have swooping elongated orbits that may change unexpectedly due to out-gassing. And they may be very old, possibly even from beyond the Solar System.

What is a dark comet? A quick guide to the ‘new’ kids in the Solar System


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