Why do larger planets tend to mostly be made up of gases?
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The majority of regular matter in the universe hydrogen. The second place finisher is helium. Both are gases unless placed under extreme conditions. The discs around proto stars during formation primarily consist of these two atoms. The protoplanets that grow the fastest do so because they gather more matter than the other planets do. They do so by gathering the most prevalent material available before other protoplanets do: hydrogen.
The majority of regular matter in the universe hydrogen. The second place finisher is helium. Both are gases unless placed under extreme conditions. The discs around proto stars during formation primarily consist of these two atoms. The protoplanets that grow the fastest do so because they gather more matter than the other planets do. They do so by gathering the most prevalent material available before other protoplanets do: hydrogen.
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