CAPE CANAVERAL - The solar system may host a ninth planet that is about 10 times bigger than Earth and orbiting far beyond Neptune, according to research published on Wednesday.
Computer simulations show that the mystery planet, if it exists, would orbit between about 200 and 1,000 times farther from the sun than Earth, astronomers with the California Institute of Technology in Pasadena said.
So far, the planet has not been observed directly.
"It's a pretty substantial chunk of our solar system that's still out there to be found, which is pretty exciting," said astronomer Mike Brown, whose discovery was published in this week's Astronomical Journal.
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