Two or more unknown planets could exist beyond the orbit of Pluto in our solar system, new research suggests.

“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. [Meet Our Solar System’s Dwarf Planets]

via Mysterious Planet X May Really Lurk Undiscovered in Our Solar System.