Which is the biggest planet: Jupiter, Saturn or Neptune?
Jupiter is the largest planet in our solar system, with a diameter of 88,729 miles. In comparison, Saturn, the second-largest planet, has a diameter of 74,600 miles, while that of Neptune, the fourth-largest planet, is 30,200 miles.References:Enchanted Learning: The Planets (Plus The Dwarf Planet Pluto)”National Audubon Society Field Guide to the Night Sky”; Mark R.