Universe Expansion

Universe Expansion refers to the phenomenon by which the cosmos is growing in size over time. This concept is a fundamental aspect of modern cosmology, illustrating that galaxies and other cosmic structures are moving away from one another. The expansion of the universe was first observed in the 1920s by astronomer Edwin Hubble, who noted that distant galaxies exhibit a redshift, indicating they are receding from us. This observation supports the Big Bang theory, which posits that the universe began from an extremely hot and dense state approximately 13.8 billion years ago and has been expanding ever since.The rate of this expansion is often measured using the Hubble constant, which quantifies the relationship between the distance to a galaxy and its velocity of recession. Additionally, the expansion of the universe is influenced by various factors, including dark energy, a mysterious force that is believed to drive the acceleration of this expansion. Understanding universe expansion is crucial for studying the overall structure, evolution, and fate of the cosmos.