We went over this, we observe the distance between galaxies increasing, but the distance between atoms has not.
The expansion happens everywhere, but subatomic forces massively overpower the expansion, so atoms don’t expand.
Likewise, raisins are strong enough to not get pulled apart by the expanding bread. There may be slight force on them, but the bread expanding by a factor of 2 leaves the raisins the same size.
I don’t understand how you think a change in distance can be detectable by light between galaxies, but not detectable by like between ends of a metre bar, or between electrons.
We went over this, we observe the distance between galaxies increasing, but the distance between atoms has not.
The expansion happens everywhere, but subatomic forces massively overpower the expansion, so atoms don’t expand.
Likewise, raisins are strong enough to not get pulled apart by the expanding bread. There may be slight force on them, but the bread expanding by a factor of 2 leaves the raisins the same size.
I don’t understand how you think a change in distance can be detectable by light between galaxies, but not detectable by like between ends of a metre bar, or between electrons.