MYTH PLANET NINE: The Hunt for a Phantom in our Solar System | SpaceTime - WELT Documentary

Science now knows a lot about the solar system. But our stellar neighborhood is still full of mysteries. For example, at the very edge of our solar system, there are some of these celestial bodies that describe strange orbits. Some astronomers suspect a mysterious object to explain the puzzling observations at the edge of our solar system: A ninth planet. "Spacetime" takes a look at the outermost solar system in search of the unknown planet.

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