> So, yes, we could've measured c wrong. We just would have no idea if we did.
We know we've got it pretty well close to accurate, for the bulk of the observable universe.
If c changes, then chemistry changes, and stuff like hydrogen absorption lines shift. This is how scientists have looked for changes in c in the early universe.
We know we've got it pretty well close to accurate, for the bulk of the observable universe.
If c changes, then chemistry changes, and stuff like hydrogen absorption lines shift. This is how scientists have looked for changes in c in the early universe.