The Expanding Universe

The expanding universe refers to the idea that space itself is stretching over time, causing galaxies to move away from each other. Imagine the universe as a balloon with dots representing galaxies; as you blow up the balloon, the dots move farther apart. This expansion was first observed through galaxies' light shifting toward the red end of the spectrum, indicating they’re receding. Space expands uniformly, meaning more distant galaxies move away faster. This concept helps explain the origin of the universe in the Big Bang and ongoing cosmic evolution. The universe's expansion continues, shaping its past, present, and future.