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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).
A gas giant is a large planet that is not composed mostly of rock or other solid matter. Gas giants may still have a rocky or metallic coreâin fact, it is expected that such a core is probably required for a gas giant to formâbut the majority of its mass is in the form of gas (or gas compressed into a liquid state).