What force prevents the Local Group from being pulled apart by the expansion of the universe?
Answer
Mutual gravitational attraction
While the universe at large is expanding and pushing galaxies away from one another, the members of the Local Group are sufficiently close that their collective gravity overcomes this expansion. This gravitational tether creates a stable, interactive system where galaxies can exchange matter and eventually merge, rather than drifting apart.
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Andromeda and the Local Group (go to 2020 4K edition) - YouTube
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