Expanding Universe Theory

The Expanding Universe Theory states that space itself is growing over time, causing galaxies to move away from each other. It’s like the surface of a balloon being inflated; as the balloon expands, dots on its surface (galaxies) get farther apart. This expansion was first observed through redshifts in light from distant galaxies, indicating they are moving away. The discovery suggests our universe is dynamic and constantly changing in size, with space stretching since the Big Bang. It's a fundamental concept in cosmology that explains the observed large-scale structure and evolution of the universe.