- The large planets of the outer solar system, also called the gas giants; Jupiter (318 Earth masses), Saturn (95 Earth masses), Uranus (15 Earth masses) and Neptune (17 Earth masses). As well as being large, the giant planets are of low density and their composition includes much volatile material like water, ammonia and methane. The giants are obviously members of a single class of planet – although they vary in size and density markedly, with a density of 0.7 for Saturn and 1.77 for Neptune. They all have ring systems and large collections of satellites.
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