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For a couple of years, I've been tossing around this idea in my head of a reality with only sky, and I'm trying to think of a valid way to explain the nature of this reality without the use of magic and fantasy. In a nutshell, there would be magnetic beings living on land masses that are in constant free fall and they could 'fly' from island to island by controlling their fall though body positioning, technology, or whatever; thats not important. My main question has to do with the free fall part. After doing some research, I've come up with this idea of a hollow planet filled with breathable air, that also has an orbiting moon, but I don't know if this would work. Could there be a theoretical situation like this where the pull from the orbiting moon causes objects inside the shell to move in a circular motion, creating an infinite free fall effect? If this shell was massive enough, would the air be uniformly distributed or would it condense at the center possessing a gravitational pull of its own? Would the moon pull the gasses inside the shell along with any other objects virtually eliminating resistance from the air? If this wouldn't work, is there anything else that could cause an infinite free fall effect? I'm interested in using this as a setting for a story, and If I could explain it using real world physics, then that would make it so much more interesting.
a hollow planet filled with breathable air
living on land masses that are in constant free fall
...falling through air so that there was a constant air resistance on things. This way, windmills...
...theres a world of endless sky where all things are in an infinite free fall, people, land masses big and small, basically any object.
I wanted this world to be falling through air so that there was a constant air resistance on things. This way, windmills set up at the edge of falling islands would be able to harness the power of the wind rushing upwards.
Also, with air resistance, people could skydive from island to island by nosediving faster than the island, or spreading their bodies out or use a parachute to fall slower than the island, allowing vertical travel.
Would the air inside the hollow planet condense and be more pressurized at the center?