Pluto demoted to dwarf planet
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dwarf planetsSpace
•The Pluto problem: Is it time to rethink our definition of a planet?
65% Informative
In 2006 , the International Astronomical Union voted on the definition of a planet.
Astronomers began to find more objects that shared similar orbits with Pluto.
The biggest confusion comes with the subtypes of the non-planets.
If an object is large enough to make itself round but not clear its orbit, like Pluto or Ceres , it gets called a dwarf planet.
Paul M. Sutter is an astrophysicist at SUNY Stony Brook and the Flatiron Institute in New York City .
His research focuses on many diverse topics, from the emptiest regions of the universe to the earliest moments of the Big Bang .
He is the host of the popular "Ask a Spaceman !" podcast and author of " Your Place in the Universe ".
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