Better way to say that the Universe is expanding only within intergalactic space, that too beyond the zero gravity spheres around the galaxies relevant, but such intergalactic space may not mean the gravitationally bound cluster or super cluster of galaxies - where there is considerable influence of gravity.
Our Galaxy, Milky Way, is gravitationally bound with Andromeda galaxy, these galaxies belong to Virgo Cluster. Therefore, the space between these galaxies, since gravitationally bound, may not follow the same nature in expansion as in other intergalactic space - not gravitationally bound.
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