>What exactly happens on a gas planet
In what sense? This question doesn’t really make any sense. What happens on a terrestrial planet?
>if they aren’t able to be walked on, then why are they considered “planets”
Because “being able to be walked on” is not part of the definition of a planet. A planet, by definition, is a body that orbits a star, has enough mass to assume hydrostatic equilibrium (be a nearly round shape), and has “cleared the neighborhood” around its orbit (meaning it has sufficient gravity to clear its orbit of other large objects). Having a solid surface is NOT a requirement for being a planet.
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