What term refers to very large planets primarily composed of gases?

The term that refers to very large planets primarily composed of gases is gas giants. Gas giants are characterized by their significant size and thick atmospheres, which are primarily made up of hydrogen and helium, along with other gases. These planets lack a well-defined solid surface and are known for their extensive systems of moons and rings. Examples of gas giants in our solar system include Jupiter and Saturn.

In contrast, terrestrial planets, which include Earth and Mars, are rocky and have solid surfaces. Dwarf planets are smaller celestial bodies that cannot clear their orbit but are not large enough to be classified as full-fledged planets. Meteorites are fragments of rock or metal that come from asteroids or comets and enter the Earth's atmosphere, but they are unrelated to the classification of planets.