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The expansion of the universe describes the observed phenomenon where the distances between galaxies appear to be growing larger over time. This is a fundamental aspect of stellar evolution, as it impacts the life cycles and fates of stars and entire galaxies. It is deeply intertwined with physics, particularly the theories of general relativity and dark energy, which help explain this expansion. In this context, understanding the expansion of the universe involves studying its history, its current state, and potential future outcomes, such as the ultimate fate of the universe. This includes examining observational evidence like redshift in distant galaxies and the cosmic microwave background radiation, as well as theoretical models that attempt to unify our understanding of this complex process.