In the late 1940s, various scientists hypothesized the existence of a background radiation (a leftover signature from the Big Bang), although they also predicted a rather cool temperature for it, in the range of 5-50K.Why did they expect such a cold radiation to permeate the universe?

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The Answer of In the late 1940s, various scientists hypothesized the existence of a background radiation (a leftover signature from the Big Bang), although they also predicted a rather cool temperature for it, in the range of 5-50K.Why did they expect such a cold radiation to permeate the universe?

In the Late 1940s, Various Scientists Hypothesized the Existence of a Background