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Too weird to be believed: a new planet in the solar system? - Bye Bye Planet Pluto - BBC science

Astronomers have a massive breakthrough as they discover a weird and very bright extraordinary object in the far reaches of our solar system. Is it a planet? Is it a block of ice? Whatever it is, it's bigger than Pluto. Fascinating science video from BBC Horizon show 'Bye Bye Planet Pluto.'

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