Arp, Halton Christian (1927–)
American astronomer noted for challenging the theory that the large redshifts
of quasars and other active galaxies are
an indication of great distance. His Atlas of Peculiar Galaxies,
published in 1966, contains photographs of 338 peculiar and interacting
galaxies taken with the Hale Telescope,
and was instrumental in raising the issue of discordant
redshifts. Arp received a B.S. from Harvard (1949) and a Ph.D. from
the California Institute of Technology (1953).
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