What is a Dwarf Planet?

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This video explains the difference between a planet, like Earth, and a dwarf planet, like Pluto.

Two More Planets May Exist Out Past Pluto in Our Solar System

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Two More Planets May Exist Out Past Pluto in Our Solar System
Via: NBC
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Via NBC: "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.