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" ... But there would be a hint. If you lived in an overdense region, even one that looked very much like an average region in every other respect, you'd find that there would be one thing that looked weird: the expanding Universe. Because you had more matter than average where you were, the galaxies nearby would mutually gravitate more forcefully, and the expansion rate of the Universe would appear slower for you. If you looked to very large, distant scales, the expansion rate would appear normal again, but right where you are, you'd measure it to be lower-than-average. Any technique that only relied on nearby measurements — things like parallax, cepheids, or even most supernovae — would give you that skewed result. ... "