What would one even look like? Would it look like a gas giant that's glowing red, along with swirls of gas in its atmosphere like Jupiter? Or would it resemble a star and have a fiery surface like the sun? I prefer to imagine them as glowing gas giants but I don't know how realistic that is.

Gas giants in general are fascinating to me as well, I really hope we send a probe into one of the gas giants with a camera before I die. I'd absolutely love to see what it looks like inside a gas giants atmosphere before the probe gets crushed by the increasing pressure as it descends.

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[–] threelonmusketeers@sh.itjust.works 2 points 4 months ago

it was commonly thought that black holes effectively compress and hold infinite mass

Black holes definitely don't have infinite mass. They might have infinite mass density (gravitational singularity) within them, but we can't know for sure, since we can't see inside black holes.