@futurebird The LHC can probe physics on scales down to about 10^-20 meters (I think). But the Planck length, the smallest scale theoretical physicists consider having any real meaning, is about 10^-35 meters. There's this gigantic gulf on the small side that really can't be experimentally explored.
The furthest astronomers can see back is to the beginning of the universe, and that light traveled about 10^26 meters. But of course we can theorize about the universe being far bigger than that.
So it's harder to see way down than way up, by several orders of magnitude.
https://mathstodon.xyz/@mattmcirvin/113583230857172508
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