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Gas Giants. Gas giants are large planets that contain more than 10 times the mass of Earth, they are also known as the Jovian or Outer Planets. Their compositions are mostly gases, such as hydrogen, and small amounts of rocky material (mostly at their cores).
1 Gas giants are not all gas. 2  Beneath the heavy atmospheres of these Jupiter and Saturn are layers of molecular hydrogen and liquid metallic hydrogen. 3  Uranus has an icy layer over its solid rock core, and covered with a gaseous atmosphere. 4  Neptune has a water-ammonia ocean for a mantle overlying its rocky core.