Astronomers are hunting for the mysterious Planet Nine

Astronomers across the globe are searching for an enormous undiscovered world dubbed Planet Nine, which could change everything we think we know about the solar system.

They know it’s out there, such is its size — potentially 10 times bigger than Earth — and its powerful gravitational pull.But Planet Nine is proving impossible to find, demonstrating how much we still don’t know about what’s in our own world’s back yard.

Astronomer Alan Duffy, a professor of astrophysics at Swinburne University of Technology in Melbourne, Australia, said the theory behind Planet Nine only emerged relatively recently after a Brazilian stargazer noticed odd happenings in the outskirts of the solar system.

“The idea is that the outer orbits of our solar system showed surprising behavior that can be explained by the gravitational pull of a very large, very distant world,” Duffy said.

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