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Gas giant

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A gas giant is a planet that does not have a hard surface like the Earth or the Moon. It just consists of the gas form of chemicals such as Hydrogen, Methane or Ammonia. When there is not enough-, or too little gas, the gas just forms a cloud which is also called a Nebula - but when there is just enough gas, it forms into a planet - but because gas is not very dense, these planets are always very large - 100's of times as big as the Earth.

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