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Astronomers Say There Could Be At Least Two More Mystery Planets In Our Solar System (sciencealert.com) 84

schwit1 quotes a report from ScienceAlert: A team of astronomers has performed new calculations on the data that originally gave rise to the Planet Nine hypothesis, and these new numbers suggest that the hypothetical extra planet might not be alone -- there could be multiple planets hiding at the edge of our Solar System that we've yet to discover. If the researchers are correct -- which nobody knows for sure right now -- it could really mean a do-over for the high school textbooks. The scientists estimate that Planet Nine is 10 times more massive than Earth, and think it performs an extremely elongated orbit of the Sun, that takes between 10,000 and 20,000 years to complete. The Caltech researchers based their hypothesis for the existence of Planet Nine on the unusual movement of six large objects floating in the Kuiper belt, suggesting that their orbits are being shaped by a hidden planet.
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Astronomers Say There Could Be At Least Two More Mystery Planets In Our Solar System

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