Until recently, the furthest known planet was an icy world called Pluto. However, Pluto is dwarfed by Earth’s Moon and many astronomers think it is too small to be called a true planet. For many years, Pluto was accepted as the ninth planet from the Sun (even though it sometimes comes closer than Neptune). Today, it is regarded as a “ dwarf planet”. It is also one of the largest members of the Kuiper Belt, a family of icy worlds that occupy the space beyond Neptune.

Why is Pluto considered a Dwarf Planet?