1. Pluto was discovered in 1930 and called the ninth planet.

2. In 2006, scientists changed the definition of a planet.

3. Pluto did not fit the new definition of a planet.

4. It was removed from the list of planets.

5. Pluto was named a “dwarf planet” instead.

6. It shares its space with other icy objects.

7. Pluto is part of a region called the kuiper Belt.

8. A spacecraft called New Horizons flew past Pluto.

9. Pluto has ice mountains and a thin atmosphere.

10. Some people still want Pluto to be called a planet again.