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en.wikipedia.org/wiki/Pluto

Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of ..... The semi-major axis and period are presently getting longer. ... This alone is not enough to protect Pluto; perturbations from the planets ( especially ...

wonderopolis.org/wonder/why-is-pluto-no-longer-a-planet

The truth is, nothing about Pluto changed, but the definition of a planet did. Once these changes became official, Pluto no longer fit the definition of a planet.

www.bbc.com/news/science-environment-33462184

Jul 13, 2015 ... In 2006, Pluto was demoted from planet status. Why was it removed from the planet club?

www.universetoday.com/13573/why-pluto-is-no-longer-a-planet

Jan 5, 2012 ... This article was originally written in 2008, but we created a cool video to go along with it yesterday. Let's find out why Pluto is no longer ...

www.loc.gov/rr/scitech/mysteries/pluto.html

The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to ...

science.howstuffworks.com/pluto-planet.htm

On Aug. 24, 2006, the International Astronomical Union (IAU), an organization of professional astronomers, passed two resolutions that collectively revoked ...

news.nationalgeographic.com/news/2006/08/060824-pluto-planet.html

Aug 24, 2006 ... Pluto is no longer a planet, according to a new official definition. Instead the icy sphere will be considered one of more than 40 "dwarf planets."

www.nasa.gov/audience/forstudents/k-4/stories/nasa-knows/what-is-pluto-k4.html

Pluto is not very big. It is only half as wide as the United States. Pluto is smaller than Earth's moon. This dwarf planet takes 248 Earth years to go around the sun.

www.economist.com/blogs/economist-explains/2015/02/economist-explains-8

Feb 16, 2015 ... The Economist explainsWhy Pluto is no longer a planet. Astronomers used to reckon that Pluto was about as massive as Earth. It turns out that ...