128i[3] would be enough for 390x observable universe discrete grid in Euclidean space with nanometer precision. Or 0.39 observable universe with picometer resolution.
There are? It looks closer to 2^14. 2^50mm is around 7.5 au. Sorry to nitpick, but I thought this was a super interesting point!
I assume you meant to type 47 rather than 14?
I rounded a bit over-zealously, thanks for nit picking. It is indeed 2^47.6333. (also assuming you meant 47 not 14.)