Where v is the receding velocity of a galaxy due to the expansion of the universe typically measured in kmsec H0 is Hubbles constant and D is the current distance to the galaxy measured in mega parsec Mpc. It shows the expansion of the Universe by showing how distant galaxies are moving away from us. Based on this relationship the farther the galaxy the faster it is moving away from Earth.
H 0 is usually quoted in kmsMpc which gives the speed in kms of a galaxy 1 megaparsec 309 10 19 km away.
The galaxies are the raisins and the dough is the space between galaxies or large structures. V H0 D. Y m x. Hubbles Law - One of the most important formulas of the 20th century.