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IANAP, but as I understand it, local clusters will remain close together due to the stronger forces of attraction they have on each other. As these clusters constitute several galaxies, I assume groupings of atoms would also stick together.
Yep, there's a sweet spot where gravity overtakes the expansion due to inverse square law. And of course, atoms and molecules are held together with forces that are stronger than gravity - at those distances, at least
I had the same thought.
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