WALT: take notes quickly.
In 1930 Clyde Tombaugh discovered a planet and he called it the name Pluto. The name came from an 11 year old girl at school. So Clyde called it Pluto but Pluto was not doing his job that a planet does. By clearing the road Pluto was not clearing its path.
In 2006 they changed its definition Pluto was the 9th planet in the system. It is still round and it still orbits the sun. But it is now a dwarf planet.
