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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 jcrites on Wednesday January 20, 2016 @02:09PM (#10940508)
The light reaching the object from the sun drops off by 1/r^2, and then the light reaching Earth from the object drops again by 1/r^2. Since the latter light is a portion of the former, you multiply them for 1/r^4.
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