@plutokiller (Mike Brown) is, you guessed it, the guy who “killed” Pluto. But he may have redeemed himself when he and colleague Konstantin Batygin proposed that a “hidden” planet, referred to as Planet 9, may explain the odd grouping of some objects beyond Neptune. Brown tweets about astronomy, science (often from his daughter’s perspective), and the transient bears that he shares his backyard pool with.
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