Dark comets - rocky solar system hybrids that look like garden-variety asteroids but move like comets - might surround Earth. And their known population just doubled! Join EarthSky’s Dave Adalian as he chats live with dark comet discoverer Aster Taylor at 12:15 p.m. CST (18:15 UTC) on Thursday, December 12. How many of these eerily-named travelers are there? Where did they come from? And are they a threat to Earth?

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