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Hey universe, let’s hear some noise!
What would eventually be called the theory of the big bang was first described by Georges Lemaître in 1927. This early description included predictions later verified in 1929, but it wasn’t until 1964, when the cosmic background microwave radiation was accidentally detected, that the theory was taken seriously by the mainstream scientific community.
Check out episode 47’s show page, where there are links that provide much of the background to this episode about the background microwave radiation.