Question

When was Pluto not a planet anymore?

Answer 1

American astronomer Clyde Tombaugh discovered Pluto in 1930. From 1930 until 2006, Pluto sat comfortably beyond Neptune as the ninth planet in our solar system.

In 2006, however, changes were made. 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.

Answer 2

Pluto was discovered on February 18, 1930 by Clyde Tombaugh. Clyde Tombaugh was only 24 years old when he made the discovery.

For 76 years, Pluto resigned as the ninth planet in our solar system. In 2006, everything changed. Pluto was reclassified as a dwarf planet.  Astronomers decided to classify Pluto as a dwarf planet because it's very far away and too small.