A new set of computer simulations suggests that there was once a fifth giant planet in addition to Jupiter, Saturn, Uranus, and Neptune.
The Fifth Planet sounds like a great name for a sci-fi movie -- perhaps a sequel to the 1997 movie "The Fifth Element." But the fifth planet may be real; a hypothesized giant world that was flung out of our solar system four billion years ago. It would have drifted tens of thousands of light years away by now.
Why even suspect that such a planet existed?
Read more: http://www.foxnews.com/scitech/2011/09/28/was-giant-planet-ejected-from-our-solar-system/
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