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Home Q & A Board Science-Related Homework Help Physics
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staedtler staedtler
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7 years ago
I thought the Big Bang was hot! If the cosmic microwave background radiation is the radiation left over from the Big Bang, why is it only 3 K?
A)   The universe has expanded and cooled to the temperature we now observe for the background radiation.
B)   The cosmic microwave background radiation we observe is not cool—it is very hot, just like the Big Bang.
C)   The Big Bang was not a hot, but a cold, explosion—its temperature was the same as we observe now from the cosmic background radiation.
D)   It is not from the Big Bang at all—it is from cold, intergalactic hydrogen clouds that cover the sky.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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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
On behalf of my study group and I, thank you
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