Quote:
Originally Posted by singertobe
Something I've been thinking about for a while. Nobody has ever been straight through the center of any of the gas planets so how do we know there isn't a solid surface buried all the way underneath all the gas clouds? There must be something that differentiates a gas planet from a star that's made of the same gases...
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I think some or all of them do have a rocky core deep inside
(or at least they are believed to have rocky cores).