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This Is Everything That’s Wrong With Our Definition Of ‘Planet’

16 Jul 2019, 15:23 UTC
This Is Everything That’s Wrong With Our Definition Of ‘Planet’ NASA’S THE SPACE PLACE

If you were alive in 2006, you likely remember a momentous event in astronomy: the International Astronomical Union (IAU) took it upon themselves to redefine what it meant to be a planet. While eight of the nine classical planets in our Solar System were still in, from Mercury to Neptune, the smallest and most distant among them — Pluto — was out.

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