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The article begins by explaining the historical background of this theory, including the contributions of prominent scientists such as Edwin Hubble. It then delves into the concept of the expansion itself, detailing how galaxies and other astronomical objects are moving away from each other, leading to an overall increase in the size of the universe. The page also explores the key observational evidence that supports the expansion, such as the redshift of distant galaxies and the measurement of the cosmic microwave background radiation. It discusses how these pieces of evidence are consistent with Einstein's theory of general relativity and the mathematical equations behind the expansion. Furthermore, the article explains some related topics, including cosmic inflation, dark energy, and the concept of the observable universe. It also addresses several alternative theories that have been proposed, such as the steady-state model and the cyclic universe hypothesis. The expansion's implications for the future of the universe and the fate of celestial objects are covered as well. The article describes the possibilities of the Big Freeze, Big Rip, and the Big Crunch, highlighting the uncertainty surrounding these outcomes. To provide a well-rounded perspective, the page includes references to key scientific publications and notable scientific controversies, ensuring that the information is up to date and supported by solid research. Overall, the page serves as a reliable resource for anyone interested in understanding the expansion of the universe, its evidence, potential future scenarios, and its implications for our understanding of the cosmos.