Hubble's Law

Hubble's Law states that the farther away a galaxy is, the faster it is moving away from us. This observation, made by astronomer Edwin Hubble, implies that the universe is expanding. Essentially, this means that galaxies are drifting apart from one another, suggesting that the universe started from a more compact state, often described as the Big Bang. Hubble's Law is a key piece of evidence for this theory and helps us understand the scale and evolution of the universe over time.