Pluto is a complex world of ice mountains and frozen plains. Once considered the ninth planet, Pluto is the largest member of the Kuiper Belt and the best known of a new class of worlds called dwarf planets
Ceres makes up almost a third of the asteroid belt's total mass, but it is still far smaller than Earth's Moon. Ceres is heavily cratered with large amounts of ice underground
Along with fellow dwarf planets Pluto, Eris, and Haumea, Makemake is located in the Kuiper Belt, a donut-shaped region of icy bodies beyond the orbit of Neptune. Slightly smaller than Pluto, Makemake is the second-brightest object in the Kuiper Belt as seen from Earth (while Pluto is the brightest). It takes about 305 Earth years for this dwarf planet to make one trip around the Sun
Originally designated 2003 EL61 (and nicknamed Santa by one discovery team), Haumea is located in the Kuiper Belt, a donut-shaped region of icy bodies beyond the orbit of Neptune. The other known dwarf planets in the Kuiper Belt are Pluto, Eris, and Makemake (dwarf planet Ceres is located in the main asteroid belt between Mars and Jupiter)
Eris is one of the largest known dwarf planets in our solar system. It's about the same size as Pluto but is three times farther from the Sun