Caltech Astronomers Say a Ninth Planet Lurks Beyond Pluto

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sciencehabit writes: The solar system may 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. Slowed down by gas, the planet settled into a distant elliptical orbit, where it still lurks today. Here’s a link to the full academic paper published in The Astronomical Journal. Read more of this story at Slashdot.

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Caltech Astronomers Say a Ninth Planet Lurks Beyond Pluto

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