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Two astronomers accidentally discovered Currently contains no response., which is evidence of universe expansion that supports the Big Bang theory. This is particularly strong evidence because its temperature is Currently contains no response.. By observing this today, we can see what the universe looked like

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Two astronomers, Arno Penzias and Robert Wilson, accidentally discovered the cosmic microwave background (CMB) in 1964, which is evidence of the universe’s expansion and supports the Big Bang theory. This is particularly strong evidence because its temperature is about 2.7 K (≈2.725 K). By observing this today, we can see what the universe looked like about 380,000 years after the Big Bang (the era of recombination / the surface of last scattering, at redshift z ≈ 1100).