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Pluto is not a planet so that would be Mercury is 13.72% smaller. Venus is 0.23% smaller. Mars is 9.42% smaller. So that means 3 planets are smaller than Earth. 48 people found this useful.
The dwarf planet Eris, shown in an artist's rendering, may be smaller than Pluto. Image courtesy NASA. 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.