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Astronomy

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    $\begingroup$ Quite correct. Indeed there are other things going on (e.g. tidal effects from the moon, low frequency seismic vibrations) that would swamp such a small change in any case. $\endgroup$
    – ProfRob
    Commented Dec 12, 2022 at 10:34
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    $\begingroup$ If my understanding is correct, even just the gravitational influence of the planet (or even just from the Sun) would be strong enough to prevent any local expansion within the neighborhood. It's possible that the mass of the LIGO equipment itself might be enough to prevent local expansion, so it might not be directly measurable even in the emptiest regions of the universe. $\endgroup$
    – Kyle A
    Commented Dec 12, 2022 at 16:46
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    $\begingroup$ Wait, I think this breaks my understanding of the Crisis in Cosmology then. If space doesn't expand universally, but only in local regions of insufficient gravity, then when the universe smaller and denser, there would be fewer regions of expansion, which would be less expansion. A smaller value using the CMB makes sense then. By the time quasars came about the average density would've been much lower, giving a higher Hubble constant value. If we find a way to measure the Hubble Constant in voids closer than the quasars, I expect an even higher value. Just a layman's perspective. $\endgroup$
    – David S
    Commented Dec 12, 2022 at 17:57
  • $\begingroup$ @DavidS I think that could be asked as a new question. $\endgroup$
    – James K
    Commented Dec 12, 2022 at 18:11
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    $\begingroup$ "In fact there is no expansion even on the scale of the local group of galaxies." I think you should reword that, such as "The expansion on the scale of a local group of galaxies is so small that it is negligible compared to gravity". $\endgroup$
    – Acccumulation
    Commented Dec 13, 2022 at 4:17