Planet X May Be Real - Evidence Mounting For 9th Planet | Video

A possible planet – larger than Earth but smaller than Neptune – orbiting the Sun once every 15,000 years, could explain the peculiar clumping of Kuiper Belt Objects in our solar system. Astronomers Konstantin Batygin and Mike Brown of the California Institute of Technology (Caltech) describe how large telescopes could detect this world, if it exists. -- 'Planet Nine': Facts About the Mysterious Solar System World (Infographic): The Evidence for 'Planet Nine' in Our Solar System (Gallery): Credit: Caltech