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Published online by Cambridge University Press: 08 February 2017
I examine some common features of several extragalactic backgrounds, beginning with the best studied of all backgrounds, the 3 K microwave radiation, then continuing on to the newly discovered submillimeter flux and the near infrared (IR) background. Both the total surface brightness and fluctuations (or anisotropies) in the brightness of these backgrounds are considered. Some implications for cosmology and for astrophysics are mentioned.