Gas giant
From Wikipedia, a free encyclopedia written in simple English for easy reading.
A gas giant is a large planet that has a solid core, but has liquid hydrogen and helium surrounding it and with an outer thick, gassy atmosphere. Common gases include hydrogen and helium and with traces of methane and other gases.
In our solar system, there are 4 gas giants: Jupiter, Saturn, Uranus, and Neptune.
Jupiter and Saturn are similar because they made up of mostly only hydrogen and [[helium] and contain massive rocky cores both bigger than Earth. Neptune and Uranus are similar because they are more made up of water and rock (a mixture of one or several minerals).
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