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slashdave t1_j6ahtf1 wrote

Galaxies are not dense on average, because of the space between stars. If you want something galaxy sized but denser, there is the serious issue of where you could obtain enough material, since the space between galaxies is quite vast.

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CubanHermes OP t1_j6ak5ph wrote

>Galaxies are not dense on average, because of the space between stars.

I get that, hence the question as to whether it is theoretically possible to build a structure the size of a galaxy with the space filled in by 'structure' without it collapsing in on itself. It's a hypothetical question so sourcing materials isn't the object of the question; the point is whether, despite the fact it would take several billion years to build at current space traversal times, it would be possible with our current understanding of our universe.

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slashdave t1_j6do6do wrote

Not sure where you are going. Given the choice of any type of construct, of course it is possible. After all, if you could somehow move astronomical masses around, you could just create your own galaxy.

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