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Gaseous planets are often significantly more massive than terrestrial planets. They are not primarily composed of solid rock, as terrestrial planets are, and instead consist of particles of water, hydrogen, and helium. Gaseous planets also lack a atmosphere, as the gas merely thins farther away from the gravitational hold of the center. Alternatively, one could say that gas giants are almost entirely composed of an atmosphere for a dense, small, or sometimes almost nonexistent core.

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