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Physics, 27.10.2019 15:43 tifftiff22

Astronomers believe that cosmic background radiation formed:
a. about 1 billion years ago.
b. about 1 million years ago.
c. shortly after the big bang.
d. about 100,000 years ago.

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Astronomers believe that cosmic background radiation formed:
a. about 1 billion years ago.
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