What is neptune made of?

Neptune is the third most massive planet. Like the rest of the gas giants, Neptune has no definite surface layer. Instead, the gas transits into a slushy ice and water layer. Like Earth, Neptune has a rocky core made up of iron and other metals, with a mass just greater than our planet. read more

Neptune, like Uranus, is one of the two outer planets known as an "ice giant." Made up of more ices than Jupiter and Saturn, the chilly body almost seems to be in a class by itself. Different images emphasize the features on Neptune. read more

Neptune, like the rest of the gas giant planets in the Solar System, can be broken up into various layers. The composition of Neptune changes depending on which of these layers you’re looking at. The outermost layer of Neptune is the atmosphere, forming about 5-10% of the planet’s mass, and extending up to 20% of the way down to its core. read more

Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times the mass of Earth and slightly larger than Neptune. Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 AU (4.5 billion km). read more