NASA describes the “surface” of Neptune as “extend[ing] to great depths, gradually merging into water and other melted ices ...

A terrestrial planet has a solid rocky surface, with metals deep in its interior ... Jovian planets include Jupiter, Saturn, Uranus, and Neptune. These planets have larger sizes and masses.

Uranus and Neptune come next ... balls of hydrogen and helium - you couldn't stand on the surface of the planet because it's not solid.

"These clouds are similar to clouds that appear as pancake-shaped features when air is pushed over mountains on Earth (though Neptune has no solid surface)," the STScI said. This marks the fourth ...