Planetary scientists suggest an Earth-like planet, no bigger than three times the Earth's mass, could lurk beyond the orbit of Neptune.
This theoretical planet could also be a lot closer to us than Planet Nine, which scientists have suggested could be orbiting anywhereThe planet could be just 250 to 500 astronomical units away from the Sun, according to the researchers, bringing it far closer to the Kuiper Belt, a collection of icy objects lurking between the orbit of Neptune and around 50 astronomical units from the Sun.
Using the latest wealth of data we've been collecting about these objects, the two scientists revisited prevailing theories as to what may be lurking past the orbit of Neptune. This planet could explain why some of these objects orbit the Sun at extreme angles, such as dwarf planet Sedna, which has an extremely elongated, 11,408-Earth-year orbit around the Sun.
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