Mysterious 'Planet X' may really lurk undiscovered in our solar system

January 20, 2015 6:15 PM

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Mysterious 'Planet X' may really lurk undiscovered in our solar system

At least two planets larger than Earth likely lurk in the dark depths of space far beyond Pluto, just waiting to be discovered, a new analysis of the orbits of "extreme trans-Neptunian objects" (ETNOs) suggests.

Researchers studied 13 ETNOs — frigid bodies such as the dwarf planet Sedna that cruise around the sun at great distances in elliptical paths. [Meet Our Solar System's Dwarf Planets]

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