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Orbit comparison to other objects in our solar system (in purple) and Planet Nine (in orange).

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Researchers have predicted that this planet could have been orbiting another star in another solar system similar to ours and could have been close enough to join the orbit around our sun and leave its other orbit.

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Caltech Researchers Find Evidence of a Real Ninth Planet | Caltech. (n.d.). Retrieved March 25, 2018, from http://www.caltech.edu/news/caltech-researchers-find-evidence-real-ninth-planet-49523

Mathewson, S. (n.d.). Planet Nine Could Be Our Solar System's Missing 'Super Earth'. Retrieved March 25, 2018, from https://www.space.com/38431-new-evidence-planet-nine-existence.html

Planet X. (2018, January 23). Retrieved March 25, 2018, from https://solarsystem.nasa.gov/planets/hypothetical-planet-x/in-depth/

Supermassive black hole found in unlikely place | Space Facts – Astronomy, the Solar System & Outer Space | All About Space Magazine. (n.d.). Retrieved March 25, 2018, from https://www.spaceanswers.com/news/supermassive-black-hole-found-in-unlikely-place/

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A super earth is a rocky planet that is larger than Earth but smaller than Neptune.  No planets have been discovered in our solar system that match these descriptions and researchers say Planet Nine could possibly be our missing “super earth”.

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A team from Caltech has shown that Planet Nine's existence may have tilted the planets of our solar system, which explains why the zone in our solar system, including the eight major planets, are tilted by about 6 degrees in comparison to our sun's equator.

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Konstantin Batygin, a planetary astrophysicist at the California Institute of Technology (Caltech) in Pasadena said, "There are now five different lines of observational evidence pointing to the existence of Planet Nine.  If you were to remove this explanation and imagine Planet Nine does not exist, then you generate more problems than you solve. All of a sudden, you have five different puzzles, and you must come up with five different theories to explain them."

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Astronomers studying the Kuiper Belt have concluded that some of the dwarf planets and other small, icy objects follow orbits that cluster together. By reviewing  these orbits, a Caltech team has predicted that a large, undiscovered planet may be hiding beyond Pluto.

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Scientists have created a prediction based on mathematical calculations and computer simulations that have shown a ninth planet in our solar system called Planet X or Planet Nine.

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This hypothetical planet is believed to be about 10 times more massive than Earth and 5,000 times the size of Pluto.  It is in complete darkness and in the outer regions of our solar system.  It is said to be approximately 20 times farther from the sun than Neptune is.  Neptune orbits the sun at an average distance of 2.8 billion miles and it would take this new hypothetical planet between 10,000 and 20,000 years to make one full orbit around the sun.  For a Neptune-like planet, the core temperature should be 70K, the surface temperature of Planet Nine should be around 10K due to the dominating coolness of its core. It has a mass of 6x10^25kg and a mean radius of 13,000-26,000 km. Since Planet Nine has yet to be discovered or observed, definite information is very limited.