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He combined the Cepheid distance data with data from Milton, and others that showed galaxies redshift, in which wavelengths of light are stretched or shifted toward the redder end of the spectrum by Doppler effect as they move away from it. More distant objects had a higher rate of redshift, showing they were moving away faster than nearby objects. How calculated expansion rate will come to be called will be on the Hubble constant. In the city of M31-B1 discovery, since then, much evidence has confirmed that we live in an ever-expanding universe. And with the discovery of dark energy in the 1990s, scientists now know that the expansion is accelerating, not just expanding, but it's accelerating.