New measurements of the emission spectrum of the night sky have been made in the frequency range from 1.7 to 40 cm^-1 using a fully calibrated, liquid-helium-cooled, balloon-borne spectrophotometer. The results show that the spectrum of the cosmic background radiation peaks at 6 cm^-1 and is approximately that of a 3-K blackbody out to several times that frequency. However, the data show deviations from a simple blackbody curve.
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Woody et al. (1979) studied this question.
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