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How was CMB radiation first discovered? Penzias and Wilson were looking for it using a radio receiver. A radio receiver accidentally picked up its energy. Scientists saw it through a high tech telescope. A mission of the COBE satellite found it.

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IIIKiXIII

Im guessing this was supposed to be a multiple choice question. The answer is: "A radio receiver accidentally picked up its energy."

Answer:

A radio receiver accidentally picked up its energy.

Explanation:

CMB is leftover radiation from the early era of the universe. It can be detected universally in all directions. Its presence provides a strong evidence of the Big Bang theory which describes the beginning of the universe 13.6 billion years ago.

Penzias and Wilson were mapping signals from the Milky Way when they accidentally picked up CMB energy. It was unexpected discovery using a radio receiver.  

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