Planet Nine, if it exists, is somewhere between 6-10 times the mass of Earth, and it may have an orbit that takes it around the sun once every 1,500 Earth years or more.
The further away and the more massive the planet is, the higher the chance that the solar system will experience a violent future.
Here's everything you need to know about Planet Nine.
The planet, which is supposed to be far beyond the orbit of Pluto, is being called as 'planet nine' by astronomers.
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