Why Is Pluto Not A Planet

If you attended elementary or middle school prior to 2006

 Mercury was the closest planet to the Sun, and Pluto was the furthest planet from the Sun

There are no longer nine planets in orbit around the Sun, but rather, there are now eight.

After 2006, Pluto was no longer considered a planet by the astronomical community.

Pluto was discovered in 1930 by the American astronomer Clyde Tombaugh

Planet X." Astronomers believed that an object roughly the mass of Earth existed beyond

the orbit of Neptune because, at the time, astronomers could not explain certain aspects

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