A dwarf planet is a celestial body (something in space) that is smaller than a moon, but is not considered a moon. A dwarf planet also can not clear its orbital path when there is debris in its way. Dwarf planets are so small that they can’t clear any obstacles in their way. A dwarf planet is also in the shape of a ball or sphere, but is not as big as a planet or moon. This is what a dwarf planet is.