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What was unique about Planet X?

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Caltech researchers have found evidence suggesting there may be a "Planet X" deep in the solar system. ... The mathematical prediction of a planet could explain the unique orbits of some smaller objects in the Kuiper Belt, a distant region of icy debris that extends far beyond the orbit of Neptune. read more

The Caltech scientists believe Planet X may have has a mass about 10 times that of Earth and be similar in size to Uranus or Neptune. The predicted orbit is about 20 times farther from our sun on average than Neptune (which orbits the sun at an average distance of 2.8 billion miles). read more

According to the US News World Report, Planet X or Nibiru exists, the article; “Shrouded from the sun’s light, mysteriously tugging at the orbits of Uranus and Neptune, is an unseen force that astronomers suspect may be Planet X – a 10th resident of the Earth’s celestial neighborhood. read more

Lowell's beliefs about Planet X, while largely disproven, shaped the public's perceptions about space, and fueled our cosmic wonder. Nibiru explained Soviet-born Zecharia Sitchin first wrote about Nibiru — a distant member of our solar system — in the 1970s. read more

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