Technically, there was never a scientific definition of the term planet before 2006. See the main article: List of exoplanets Definition of a planet Eris follows the most elliptical path of any planet.Ceres is the largest asteroid (not to mention plutinos) in the Solar System's main asteroid belt.It has not been found, but some astronomers think its gravity pulls on the orbits of many dwarf planets. Planet Nine – a hypothetical planet beyond Neptune.
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