The term "protogalaxy" refers to a hypothetical structure in the early stages of galaxy formation in the universe. Protogalaxies are considered to be regions of gas and dark matter that will eventually coalesce and evolve into full-fledged galaxies. This concept is particularly relevant in the context of the cosmological model of the universe, where it is believed that after the Big Bang, matter began to clump together under the influence of gravity, leading to the formation of these early galactic structures.
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