Physics Question #3413

Hugo Verissimo, a 35 year old male from Lisbon asks on April 19, 2006,

We know that cosmic microwave background is 2.725 kelvin. We know universe was some 13Billion years old so we know that its radius is 13Billion light-years. So the question is: what is the total energy (in joules) of the cosmic microwave background?

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