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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.
Even though Neptune's volume is 72 times that of Earth's, its mass is only 17 times Earth's mass. Like Jupiter and Saturn, Neptune is one of the 'gas giant' planets, composed of a deep atmosphere around a liquid surface and sometimes a solid core. Its atmosphere consists of mostly hydrogen and helium, but up to three percent of its atmosphere is made up of methane, which gives the planet its striking blue colour.