SPENCER SUTTON / SCIENCE PHOTO LIBRARY SPENCER SUTTON / SCIENCE PHOTO LIBRARY
Dwarf planets. Six dwarf planets in a row showing their comparative sizes. From left to right: Moon, Eris, Pluto, Haumea, Makemake, Ceres. A dwarf planet is an object that fails to dominate its orbit around the Sun (unlike a true planet), but which still has an independent orbit (unlike moons), and is large enough to be spherical due to gravity.
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