Planet X – 9th Planet? Astronomers Say A Neptune-Sized Planet DOES Lurks Beyond Pluto

By Eric Hand – Sciencemag.org The solar system appears to have a new ninth planet. Today, two scientists announced evidence that a body nearly the size of Neptune—but as yet unseen—orbits the sun every 15,000 years. During the solar system’s infancy 4.5 billion years ago, they say, the giant planet was knocked out of the planet-forming region near the sun. … Continue reading →