Photon Density of the Universe

The current temperature of the observable universe is about 2.7 K. What is the photon density of the universe in \(\frac{photons}{{m}^{3}}\)?

First calculate your answer in the form \(a\times { 10 }^{ b }\), then input the value \[\left\lceil a \right\rceil +b.\]

Note: we assume that the universe is isotropic.

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