From Space.com:
Mysterious Planet X May Really Lurk Undiscovered in Our Solar System
"Planet X" might actually exist — and so might "Planet Y."
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.
The distances are huge - from our Earth tot he Sun is considered to be one astronomical unit (1AU). These would be at 200 AU or further.
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