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History, 14.04.2021 20:10 vanessa7676
The universe began about 14 billion years ago and has been expanding and cooling ever since. What does this statement most completely describe?
A. the Doppler effect
B. the big bang theory
C. cosmic background radiation
D. light years
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The universe began about 14 billion years ago and has been expanding and cooling ever since. What do...
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