"Dark comets," which are near-Earth asteroids that behave like comets and could contain water ice, have mostly come from the asteroid belt between Mars and Jupiter and could make up as much as 60% of all near-Earth objects, a new study suggests.
Dark comets were first revealed in 2023, when a team led by Darryl Seligman of Cornell University identified six of them based on their anomalous motions.
