Astronomers found new evidence that a giant ghost planet may lurk in our solar system

Astronomers have found some surprising evidence that there's a ninth planet in our solar system — and no, they don't mean Pluto. In a new paper published this week, scientists announced they'd identified a small, rocky object well past Neptune whose movement patterns suggest it could be pulled by a large planet. The rock, dubbed 2015 BP519, orbits the sun at an angle that's distinct from all the planets in the solar system — so the scientists suggest that a giant hidden planet with 10 times the mass of Earth could be responsible for that wonky orbit.

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