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.
Read more about this topic: Planets Beyond Neptune
Famous quotes containing the words subsequent, proposed and/or planets:
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