Another planet may be lurking at the outer edges of our Solar System. We haven’t seen it yet, but two scientists at Caltech think it’s all but a certainty at this point. Here’s all the evidence pointing to a mysterious planet in our cosmic neighborhood. Subscribe: https://goo.gl/G5RXGs Check out our full video catalog: https://goo.gl/lfcGfq Visit our playlists: https://goo.gl/94XbKx Like The Verge on Facebook: https://goo.gl/2P1aGc Follow on Twitter: https://goo.gl/XTWX61 Follow on Instagram: https://goo.gl/7ZeLvX Read More: http://www.theverge.com