ElI5: how do they know what other planets are made off, how can the be so sure? Jupiter could be made of a completely unknown gas?
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In addition to what other have said, we know everything in the solar system came from the same proto-planetary disk so it’s all made of the same stuff. The inner planets are rocky because the denser material sunk towards the center due to gravity.
Hydrogen and helium are also generally the most common elements in the universe and go into the making of all gas planets. So it’s not really possible for any gas planet to be made of an entirely unknown gas.
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