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At the very center of Neptune is the planetâs core. The core of Neptune is made of iron, nickel and other silicates that make up about 1.2 times the mass of the Earth. We have written many stories about Neptune on Universe Today.Hereâs an article about how there could be oceans inside Neptune.eptune, 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 youâre looking at. Letâs see what Neptune is made of.
Neptune. Neptune is the eighth planet from the Sun and the fourth largest (by diameter). Neptune is smaller in diameter but larger in mass than Uranus. In Roman mythology Neptune (Greek:Poseidon) was the god of the Sea. Neptune has many moons and one big one named Triton.It also has Rings.eptune. Neptune is the eighth planet from the Sun and the fourth largest (by diameter). Neptune is smaller in diameter but larger in mass than Uranus. In Roman mythology Neptune (Greek:Poseidon) was the god of the Sea. Neptune has many moons and one big one named Triton. It also has Rings.