Illustration comparing the size of Earth (left) with the planet Neptune. Neptune is the farthest planet from the Sun, with an average distance from it of 29.8 times the Earth-Sun distance. Being a fluid world of mostly hydrogen and helium, rich in ices of methane, water and ammonia, astronomers label it (along with Uranus) an ice giant. With a diameter of 3.9 times that of the Earth, Neptune is the Solar System's fourth largest planet.
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