How does Hubble's Law relate to redshift?

Edwin Hubble's 1929 announcement that nearly all galaxies appeared to be moving away from us is the basis for the theory used to calculate these extremely large distances in the universe. Edwin Hubble also discovered that the universe is expanding.

All distant galaxies are moving away from us, and the farther away they are, the faster they are moving, according to Hubble theory. This recession of galaxies away from us results in a redshift in the light from these galaxies, which can be determined by looking at the absorption or emission lines in its spectrum.

When an object moves in space, either toward or away from us, the absorption or emission lines will be found at different wavelengths than where they would be if the object was not moving (relative to us). These sets of lines are specific to each atomic element and always have the same spacing.

Redshift is a measurement of the increase in wavelength of light emitted by far-off galaxies as a result of their motion away from us. Hubble's Law can be expressed mathematically as v = H0 * d, where v is the velocity, H0 is the Hubble constant, and d is the distance. Redshift (z) is related to velocity by the equation z = v/c, where c is the speed of light. As a result, redshift and Hubble's Law are related, signifying the expansion of the universe.