Planet 10, The Solar System Wiki
Planet 10 is a hypothetical body in the solar system said to be beyond the eighth planet Neptune and the demoted Pluto. It is theorized to be either around the mass and size of Mars or Earth and lies at the edge of the Kuiper Belt. Like Planet Nine, we haven't confirmed the existence of Planet Ten as of now. It is possibly responsible for the existence of the "Kuiper Cliff" which is located at around 50 AU from our star, the Kuiper Cliff is an area where the Kuiper Belt seems to cut off like the
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Planet 10, The Solar System Wiki
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