What does Hubble's Law state about galaxies?

Hubble's Law states that the faster a galaxy is moving away from us, the farther away it is from us. This observation implies a relationship between distance and velocity, which indicates that galaxies are receding from each other as the universe expands. The law is a key piece of evidence for the Big Bang theory, supporting the idea that the universe is continuously expanding over time. This correlation allows astronomers to infer the relative distances of galaxies based on their redshift, which is the phenomenon where the light from an object shifts to longer wavelengths as it moves away from an observer. Therefore, recognizing that a greater speed corresponds to a greater distance is foundational to understanding the dynamics of the universe’s expansion.