A massive, unknown planet may be hiding in our solar system. These astronomers explain


Some 20 times farther away than Neptune — which is currently the last planet in the solar system — astronomers at the California Institute of Technology say they have found evidence of a new ninth planet. For now, they're calling it…
…wait for it…
Planet Nine.
READ MORE: http://www.vox.com/science-and-health/2016/1/20/10799534/new-ninth-plane...