Gas giant

A gas giant is an enormous planet built mostly from hydrogen and helium, with no solid ground: the atmosphere simply grows denser and hotter with depth until it blends into an exotic fluid interior. Jupiter and Saturn are our local examples. Because they are so large, and their gas is easy to catch crossing a star, the first exoplanets found around Sun-like stars were gas giants, and they still fill the catalogs.

A gas giant that orbits scorchingly close to its star is called a hot Jupiter, one of the strangest and best-studied kinds of world. "Your weight" on a gas giant is meaningless because there is no surface to stand on, so gravityfinder reports the pull at its cloud tops instead, and for some worlds, what a voice would sound like carried through that thick air.