Hubble Constant

The Hubble Constant is a way to measure how fast the universe is expanding. It relates the speed at which galaxies are moving away from us to their distance, meaning the farther a galaxy is, the faster it appears to be receding. This helps scientists estimate the universe's age and understand its overall behavior. Essentially, it’s like a cosmic speed limit for the universe's expansion, providing a key piece of information about the universe’s history and size.