At what point in the age of the universe did it cool to a temperature of about 3 K?
A) at the end of the quark confinement
B) at the end of the deuterium bottleneck
C) very recently
D) when the temperature reached the proton threshold
Correct Answer:
Verified
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Q45: What is the deuterium bottleneck?
A)Deuterium had to
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