Slipher, Vesto Melvin
Slipher, Vesto Melvin(slī`fər), 1875–1969, American astronomer, b. Mulberry, Ind. From 1901 he was at Lowell Observatory, Flagstaff, Ariz., where he served as director (1917–54). Much of his attention was devoted to the investigation of astronomical spectroscopy, in particular to the rotations and atmospheres of planets and nebulae. His major contribution was determining that the spectra of the vast majority of external galaxies had red shiftsred shift
in astronomy, the systematic displacement of individual lines in the spectrum of a celestial object toward the red, or longer wavelength, end of the visible spectrum. The effect was discovered by V. M. Slipher of Lowell Observatory.
..... Click the link for more information. . This crucial discovery laid the foundation for Hubble's lawHubble's law,
in astronomy, statement that the distances between galaxies (see galaxy) or clusters of galaxies are continuously increasing and that therefore the universe is expanding.
..... Click the link for more information. and the theory of the expansion of the universe. His brother, Earl C. Slipher, 1883–1964, was a noted planetary astronomer who also worked at the Lowell Observatory. His many years of observations of the planet Mars were published in 1962 as The Photographic Story of Mars.