A mysterious planet may be hiding at the edge of our solar system

A mysterious planet — called Planet 9 or Planet X — may be hiding at the edge of our solar system. Will we ever find this world? Planet nine may be orbiting far from the Sun, at the edge of our solar system. Astronomers, seeing odd irregularities in the orbits of the outer planets suspect another, unknown, planet may orbit beyond the eight we know of today. The number of known planets in our solar system has risen and fallen over time. From the six worlds known to ancient people (including Earth), astronomers have found the planets Uranus and Neptune.…

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