Answer :
Pluto was the ninth planet in our solar system. But in 2006, it was officially reclassified as a dwarf planet, because it is so small and its gravitational field is not as strong as that of the major planets.
Pluto was the ninth planet in our solar system. But in 2006, it was officially reclassified as a dwarf planet, because it is so small and its gravitational field is not as strong as that of the major planets.