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Who discovered the Cosmic Microwave Background?
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That would be Arno Penzias and Robert Wilson. They were working at Bell Labs in New Jersey, and they were trying to make sense of all the noise coming from the sky. The Cosmic microwave background is the afterglow of the Big Bang, and it contains a lot of information about the early universe. Penzias and Wilson were able to figure out that the signal they were receiving was not coming from the sky, but was actually being generated by their radio antenna.