What law states that galaxies move away from us at a rate proportional to their distance?

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Hubble's law is fundamental in cosmology and describes the observation that galaxies are receding from us, and the speed at which they are moving away is directly proportional to their distance from Earth. This means that the farther a galaxy is, the faster it appears to be moving away. This phenomenon is a key piece of evidence for the expanding universe model and was first articulated by astronomer Edwin Hubble in the 1920s through careful measurements of the redshifts of galaxies.

This relationship is often represented by the equation v = H₀ × d, where v is the velocity at which a galaxy is receding, d is the distance to the galaxy, and H₀ is Hubble's constant, which provides the proportionality factor. Hubble's law has significant implications for understanding the dynamics of the universe and provides insight into its age and ultimate fate.

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