Planets Beyond Neptune - Subsequent Proposed Trans-Neptunian Planets

Subsequent Proposed Trans-Neptunian Planets

Although most astronomers accept that Lowell's Planet X does not exist, a number have revived the idea that a large unseen planet could create observable gravitational effects in the outer Solar System. These hypothetical objects are often referred to as "Planet X", although the conception of these objects may differ considerably from that proposed by Lowell.

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