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At deep enough depths, the methane may transform into diamond crystals. Like Earth, Neptune has a rocky core made up of iron and other metals, with a mass just greater than our planet. Temperatures in the core could reach 9,260 F (5,127 C).Strange rings. Like the other gas giants, Neptune boasts a series of rings. But the blue planet's six rings are not as solid as its neighbors.t deep enough depths, the methane may transform into diamond crystals. Like Earth, Neptune has a rocky core made up of iron and other metals, with a mass just greater than our planet. Temperatures in the core could reach 9,260 F (5,127 C).
What are planets made of? A: Quick Answer. The inner planets, Mercury, Venus, Earth and Mars, are made up of silicate rock and heavy metals such as iron and nickel, whereas the outer planets, Jupiter, Saturn, Uranus and Neptune, are made up mostly of gases, according to Universe Today.