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doit_the_clown doit_the_clown
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7 years ago
What is the ratio of cosmic microwave background photons to hydrogen atoms, on average, in our universe?
A)   About 1 billion to 1
B)   About 1 million to 1
C)   About 1 to 100, very few microwave photons
D)   About 1 to 1, equal numbers of photons and H atoms
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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papachulopapachulo
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7 years ago
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doit_the_clown Author
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