Planets Beyond Neptune

Science tells us there are only eight planets in our solar system. But will advanced technology and improved telescopes prove us wrong?

“According to at least two teams of researchers, there might be a few planet-sized worlds lurking out beyond Neptune,” says host Hank Green. Some scientists theorize there is a planet at least 10 times the size of Earth out there quietly orbiting the sun. Green explains in this edition of SciShow.

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