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A comment on Caltech Researchers Find Evidence of a Planet Beyond Pluto. Parent comment

Re:Caltech Researchers Find Evidence of a Planet Beyond Pluto by InclinedPlane on Wednesday January 20, 2016 @05:18PM (#10941808)
Planets are small. A planet 4x the diameter of Earth but 300+ AU away is a factor of about 1 to 1 million. That's equivalent to a single grain of sand nearly a kilometer away.
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