<ul><li>Researchers from NASA’s Jet Propulsion Laboratory have discovered seven more dark comets, doubling the current amount.</li><li>These objects are celestial bodies that looks like asteroids but move like comets.</li><li>The researchers found that there are two different types of dark comets, inner and outer.</li><li>Outer comets are related to Jupiter and possessed larger elliptical orbits.</li><li>They also contained more reflective matter compared to their inner solar system counterparts.</li><li>The smaller inner dark comets had nearly circular orbits.</li><li>Researchers still have many questions such as where they came from and how they got their anomalous acceleration.</li><li>These comets are potential sources for materials necessary for the development of life on Earth.</li><li>Their albedo and orbits were analyzed to reveal the different types.</li><li>The findings were published in the Proceedings of the National Academy of Sciences.</li></ul>

NASA Researchers Discover More Dark Comets

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