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The Evidence for Planet Nine’s Existence

Why do some astronomers think there’s a massive planet on the edge of our solar system?

Publish Date: Topic: Space + FlightSpace & FlightNova
By Ana Aceves and Caitlin Saks

Two astronomers argue that the farthest objects in the Kuiper Belt are being pushed and pulled by the gravity of Planet Nine, a giant planet orbiting over 10 times farther from the Sun than Neptune. If they find it, it’ll be the first real expansion of the Sun’s planetary album in 170 years.

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