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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).
The inner planets (in order of distance from the sun, closest to furthest) are Mercury, Venus, Earth and Mars. After an asteroid belt comes the outer planets, Jupiter, Saturn, Uranus and Neptune.The interesting thing is, in some other planetary systems discovered, the gas giants are actually quite close to the sun.This makes predicting how our Solar System formed an interesting exercise for astronomers.rtistâs impression of the solar system showing the inner planets (Mercury to Mars), the outer planets (Jupiter to Neptune) and beyond. Credit: NASA. In our Solar System, astronomers often divide the planets into two groups â the inner planets and the outer planets.