Siraj’s Planet Y search started about a year ago when he was trying to find out whether the shape of the Kuiper Belt is flat. “The planets of the solar system have slight tilts up and down, but ...
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'Planet Y' theory hints at hidden Earth-size world lurking in the solar system — and it could be much closer to us than 'Planet Nine'
also known as Planet X, likely lurks somewhere within the Kuiper Belt — a giant disk of asteroids, comets and dwarf planets (including Pluto) that orbit the sun beyond the eight known planets — but ...
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