Neptune is the eighth and farthest planet from the Sun. It is about 30 times as far from the Sun as Earth is. It is large enough that about 58 Earths could fit inside it. The outside part of Neptune is hydrogen, helium, and methane gas. But scientists think that Neptune's core could be rock and ice.

This image was taken by the Voyager 2 spacecraft.

The drawing shows what the inside of Neptune might be made of. The core could be about the same mass as Earth and made of rock and ice.

Image credit: Calvin J. Hamilton.

Neptune has a strange system of rings, or parts of rings. No one knows what they are made of.

Image by the Voyager 2 spacecraft.