Neptune is actually known as an ice giant so it is ice and gas, not rock.
Comment : Yes, it's a bit confusing because it is called a gas giant too.
Also it could have some rock in the centre. Still, it's more gas
than rock.
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Neptune is a gaseous planet, primarily composed of hydrogen, helium, and other gases. It does not have a solid surface like rocky planets such as Earth or Mars.
The names of the gaseous planets in our solar system are Jupiter, Saturn, Uranus, and Neptune.
It's rocky.
Gaseous planets include Jupiter and Saturn, while terrestrial planets include Mercury, Venus, Earth, and Mars. Gaseous planets are primarily composed of hydrogen and helium, with no solid surface, whereas terrestrial planets are rocky, with a solid surface.
Saturn is classified as a gas giant, consisting primarily of hydrogen and helium with a small rocky core at its center.
Rocky planets and gaseous planets.