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View submission: Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
As far as I'm aware it's because of the so called "frost line".
https://en.wikipedia.org/wiki/Frost_line_(astrophysics[1])
1: https://en.wikipedia.org/wiki/Frost_line_(astrophysics
Volatiles condense beyond that point, allowing protoplanets to accrete them, and build themselves into gas giants.
There's nothing here!