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PopeBrendicus t1_j6bt0mp wrote

Reply to comment by RShArren in Is there an upper limit to structure size in a vacuum? Could a sufficiently advanced civilisation build a galaxy sized structure in space or would it become too massive and collapse in on itself? by CubanHermes

>Let's assume that the nanites are made of carbon

>the mass of the Moon is 10^22 kg. So one Moon is more than enough to build such a ring around the Galaxy...

Carbon is only available in trace amounts on the moon. Carbon makes up about 0.46% of the universe, but it's not like it's conveniently all in one place for mining.

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Tratakaro t1_j6er2es wrote

Tbf, at that point, you might be able to just re-arrange atoms to be whatever you want.

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