It is FAR easier to hold up a mass via tension from above than to push it up via compression from below. So cities in huge underground caves can be MUCH taller if they hang from the cave ceiling, relative to pushing up from the cave floor.
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So do you know a physics limit on cave size?
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depends on lots of factors. In my case, I was researching lunar caves / tunnels so 1/6 g meant "much bigger" Ceilings will collapse if too flat/wide, result is that walls will have inverse angle of repose Limit to THAT? did some research on buckling column math; forget deets
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