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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.
Size is the most obvious difference between the inner and outer planets. The outer planets are huge! Our largest inner planet is Earth, and Earth is only 1/4 the size of the smallest outer planet, Neptune. The inner planets are rocky, sometimes all the way to their core. Gas giants are made mostly of gas with a non-gaseous core.