A research says, solar system may host a ninth planet that is about 10 times bigger than Earth and orbiting far beyond Neptune. Astronomers with the California Institute of Technology in Pasadena said, computer simulations show that the mystery planet, if it exists, would orbit about 20 times farther away from the sun than Earth.

So far, the planet has not been observed directly. Astronomer Mike Brown, whose discovery was published in this week's Astronomical Journal, said, it's a pretty substantial chunk of our solar system that's still out there to be found, which is pretty exciting.

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