The Critical Mass Density of the Universe Today Is 8 $\varOmega$

question 22

Essay

The critical mass density of the universe today is 8 × 10^-27 kg/m³.Using the current observed value of $\varOmega$ _luminous,what is the average density of protons in the universe? If they were spread evenly throughout the universe,what would be their typical separation? Note that the mass of the proton is 1.7 × 10^-27 kg.

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