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Two astronomers accidentally discovered Currently contains background radiation., which is evidence of universe expansion that supports the Big Bang theory. This is particularly strong evidence because its temperature is Currently contains uniform.. By observing this today, we can see what the universe looked like Currently contains 13,700,000,000 years ago..

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Two astronomers accidentally discovered the cosmic microwave background radiation: Arno Penzias and Robert Wilson (1964). It is evidence of the universe’s expansion that supports the Big Bang theory. This is particularly strong evidence because its temperature is remarkably uniform across the sky — about 2.725 K, with only tiny fluctuations (~1 part in 100,000). By observing this today, we can see what the universe looked like about 13.7 billion years ago (the CMB photons were emitted roughly 380,000 years after the Big Bang).