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This question already has an answer here:

It's a fantasy setting, and the world is crazy, but has anyone tried to science it? Weather patterns that are unstable only around what are essentially the Equator and the Greenwich, that change frequently; chunks of just land hanging around in the middle of the sky; people who "kick the air" so hard that they can run in it; vast ranges in size for all creatures without apparent health issues; feats of superhuman strength from human beings. All that stuff's normal for them. Why?

What's so different about their planet that this works? The atmosphere? Gravity? The number of moons?

"One Piece" here refers to the manga by Oda. One Piece Wiki The chunk of floating land refers to part of a place called Skypiea.

The question is specifically asking about the physics behind:

What gravity/atmosphere would be needed to allow chunks of land to float inside a planet's lower atmosphere?

And by float, I mean staying at a set distance from the surface for 400+ years without destroying life on the surface.

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marked as duplicate by L.Dutch - Reinstate Monica, AlexP, StephenG, Separatrix, Ash May 8 '18 at 10:13

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ This is a duplicate indeed. $\endgroup$ – Ekaen May 8 '18 at 8:15
  • $\begingroup$ @Ekaen, StephenG: I'm asking if it's possible with in the lower atmosphere- without the planet being destroyed. $\endgroup$ – Not the letter A May 8 '18 at 8:28
  • $\begingroup$ @NottheletterA It worked in one piece because they had different types of clouds that could actually support humans and the island was blasted there. Using a fantasy land as a reference and then asking about the physics doesn't make any sense since many aspects of fantasy violate laws of physics even if they are believable. $\endgroup$ – Shadowzee May 9 '18 at 2:12