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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.
The outer of the planets are made mostly of gases like hydrogen, helium and nitrogen. 1  The Gas Giants-Jupiter and Saturn are composed of mainly hydrogen and helium.2  The Ice Giants-Uranus and Neptune are composed of hydrogen and helium but have much more methane and ices. 3  they are all made of liquid, too.onfidence votes 55. The outer of the planets are made mostly of gases like hydrogen, helium and nitrogen. 1  The Gas Giants-Jupiter and Saturn are composed of mainly hydrogen and helium. 2  The Ice Giants-Uranus and Neptune are composed of hydrogen and helium but have much more methane and ices.