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staedtler staedtler
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7 years ago
At what point in time did the universe cool to a temperature of about 3 K?
A)   At the end of the inflationary era   C)   Very recently
B)   At the end of the Planck time   D)   At the era of recombination
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
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papachulopapachulo
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7 years ago
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staedtler Author
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7 years ago
I really appreciate your help!
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