Astronomers spot a new object orbiting the Sun that supports the Planet Nine theory

There are officially eight planets in our Solar System -- yes, I know, Pluto was totally a planet, but not anymore -- but that doesn't mean there isn't something lurking on the edge of our system that hasn't yet been spotted. Evidence of a still-undiscovered planet, called Planet Nine or Planet X by scientists, has been mounting for some time, and a newly-discovered object far out from the Sun may be the latest piece to the growing puzzle. The object's official name is 2015 TG38, but it's been n...