And, you could even squeeze those people into tighter spaces to allow for the rest of the planets surface to be freed up for other things. Like growing crops, mining, or any other number of worthwhile uses of space.
500 billion gives over 10,000 square feet of space. Way more than would be necessary. Way more than people living in NYC currently have which in turn has far more than other cities, like Tokyo or New Delhi.
And that's only with our modern buildings. With structures like 40k has, surface area of a planet could easily double or even triple as far as people living there are concerned.
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