The rumor of a tenth planet has been bandied about by practical jokers and space geeks forever, so why did it take so long for scientists to confirm that this object exists? These images comparing orbits clears it up a bit, and there’s this: “The planetoid is so far from the sun, it takes 10,500 Earth years to travel around the sun.” Sedna, named after an Inuit goddess, is also not technically a planet…
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