Vast and massive planets primarily composed of various gases are known as gas giants, or gas planets. These planets lack a firm, well-defined surface, making them inherently uninhabitable. However, some possess a significant number of moons. Gas giants generally support minimal life unless their atmosphere contains a layer capable of sustaining oxygen-breathing species. Such atmospheres can also contain violent storms, as seen on the planet Wynkahthu. The presence of planetary rings, consisting of millions of debris fragments, is another characteristic of these worlds. In certain instances, this debris is rocky and abundant in ore.
These planets' considerable mass results in gravity wells, posing minor but noticeable risks to hyperspace travel. A particularly large gas giant could, under specific conditions, evolve into a star.
Examples of gas giants include Ajara, Bespin, Endor, Jestefad, Lefrani, Galaan, Hudalla, Noctu, Pujool, Cavas, Kol Iben, Golus, and Yavin. Bespin is unique among these planets due to its oxygen-rich Life Zone, which teems with diverse life forms and is home to Cloud City.