Halton Christian "Chip" Arp (March 21, 1927 December 28, 2013) was an American astronomer. He was known for his 1966 Atlas of Peculiar Galaxies, which (it was later realised) catalogues many examples of interacting and merging galaxies. Arp was also known as a critic of the Big Bang theory and for advocating a non-standard cosmology incorporating intrinsic redshift. Read more