expanding universe

The expanding universe refers to the observation that galaxies are moving away from each other, suggesting that the universe is growing larger over time. This idea is supported by the redshift of light from distant galaxies, indicating they are receding. The expansion began with the Big Bang, about 13.8 billion years ago, where all matter was concentrated in a small space before rapidly expanding. This phenomenon not only shapes our understanding of cosmic structure but also raises questions about the universe's future, including possible scenarios like continued expansion or collapse.