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Could a gas giant with layer similar to Earth atmosphere exist?

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Imagine a world like ours. Gravity, atmosphere, sky... just nothing solid down there. At least not anywhere close. Would it be possible?

I know this is similar to this question. So to specify what I mean:

I'm not asking if a gas giant could be naturally created. All I want to know is whether it could exist at all? If it was created artificially, by whatever means, would it be possible for it to sustain, survive a similar time as Earth did, without continuous energy income?

Also, I don't care what its main part is. I only care about one layer. Down there anything known or suspected might be. Actually, the more of the deadliest stuff the better.

And last but not least, would it be possible for both gravity and pressure to be Earth-like at some depth?

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This post was sourced from https://worldbuilding.stackexchange.com/q/22941. It is licensed under CC BY-SA 3.0.

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