Universe Expansion

The expansion of the universe, as described by General Relativity, refers to the observation that galaxies are moving away from each other over time. This phenomenon results from the stretching of space itself, rather than galaxies traveling through space. According to the Big Bang theory, the universe began as a hot, dense point and has been expanding ever since. As space expands, the light from distant galaxies shifts to longer wavelengths, which we perceive as redshift. This expansion suggests that the universe is dynamic and not static, fundamentally altering our understanding of its structure and evolution.