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The Verge: What makes a planet a planet?

Over a decade ago, astronomers thought they had found the 10th planet in our Solar System — an object that would eventually be named Eris.

But this tiny world never became a planet. Instead it led to Pluto’s famous demotion from a planet to a dwarf planet, a decision that people are still debating to this day. So what is the difference between a planet and a dwarf planet?

 

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