The Search for a Ninth Planet in the Solar System
The Search for a Ninth Planet in the Solar System
The Orbit of Planet Nine by Michael E. Brown & Konstantin Batygin
In 1930, Pluto was discovered and officially named the ninth planet. However, in 1978, Pluto was determined to be too low in mass to have caused these perturbations, so the possibility of a tenth planet was proposed. In the 1990s, however, it was discovered that Neptune is less massive than astronomers thought, which explained the apparent discrepancies in Uranus’ orbit. At this point the search for additional planets was largely abandoned.
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