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xkcd #3083: Jupiter Core
(xkcd.com)
And these are the leading theories. Now let's see the crackpot ones!
Regular planet pretending to be a gas giant to avoid attention
Spectacular fail.
What happened to the ice cream ball with a chocolate core hypothesis? I think it looks like it could be a huge ball of Viennetta.
The Algebraist spoilers
Spoiler
A hidden artificial wormhole
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