What fundamental force is at the heart of galaxy aggregation, pulling galaxies into groups and clusters?
Answer
Gravity
Gravity is explicitly identified as the fundamental force responsible for binding structures like individual stars within a galaxy, and more significantly, pulling separate galaxies together into larger configurations such as groups, clusters, and superclusters. This dominance of gravitational attraction between the immense masses of galaxies is what allows these structures to overcome the mutual outward push caused by the general expansion of space, particularly on localized scales where matter density is sufficiently high. It is the engine driving the assembly of cosmic structures across billions of years.
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What Force Binds A Galaxy Together? - Physics Frontier - YouTube
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