We don't know everything about Planet Nine, but we know enough for some estimation questions.
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Could You Live on Planet Nine?
This Isn’t the First Time Astronomers Have ‘Found’ a Planet Nine
Based on the weird orbits of a handful of outer solar system worlds, scientists believe they've found a new planet.
The post This Isn’t the First Time Astronomers Have ‘Found’ a Planet Nine appeared first on WIRED.