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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).
Jupiter, Saturn, Uranus and Neptune are gas giants which means that they don't have a well defined solid surface like the earth and Mars do. Find out more about what kind of planets Jupiter, Saturn, Uranus and Neptune are with help from an experienced graduate student in this free video clip.