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Planet Y: A Hidden Earth-Size World Could Lurk Far Closer Than 'Planet Nine'
The simulation of the Solar System that came the closest to the observation was the presence of a small planet, between the ...
In the cold, distant reaches of the Solar System, far beyond Pluto, astronomers have just identified what could be a new dwarf planet. It's called 2017 OF 201, a rock that appears to be some 700 ...
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