On Thursday, the international astronomical intelligentsia decided to make parents across the United States feel hopelessly outdated with the most significant news for grade school dioramas ever: Pluto is no longer a planet.

Pluto’s 76-year stint as the ninth rock from the sun came to a sudden end because it does not “clear the neighborhood around its orbit” — part of the new planetary definition of the International Astronomical Union conference held in Prague, Czech Republic.