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Astronomers suspect a hidden giant lurking far beyond Neptune

Astronomers are closing in on what looks like a colossal missing piece of the Solar System, a giant planet that appears to ...
Forbes

Meet ‘Planet Y’ As New Evidence Suggests Secret World Beyond Neptune

There may be a warp in the Kuiper Belt, possibly caused by “Planet Y” — a Mercury-to-Earth-sized world that orbits the sun way beyond the orbit of Neptune. Is there a mysterious “Planet Y” orbiting ...