Atlas of Peculiar Galaxies
by Halton C. Arp
Publisher: California Institute of Technology 1966
Number of pages: 190
The primary goal of the catalog was to present photographs of examples of the different kinds of peculiar structures found among nearby galaxies. Arp realized that the reason why galaxies formed into spiral or elliptical shapes was not well understood. He perceived peculiar galaxies as small "experiments" that astronomers could use to understand the physical processes that distort spiral or elliptical galaxies.
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