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.
