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The planets of the Solar System can be divided into categories based on their composition: 1  Terrestrials: Planets that are similar to Earth, with bodies largely composed of rock: Mercury, Venus, Earth and Mars. At 0.055 Earth masses, Mercury is the smallest terrestrial planet (and smallest planet) in the Solar System. Earth is the largest terrestrial planet.
The dwarf planet Eris, shown in an artist's rendering, may be smaller than Pluto. Pluto is still not a planet, but it may have regained some of its former gloryânew pictures suggest the demoted world is in fact the biggest dwarf planet of them all.