Density of the Universe
`rho_"(Universe)" = 3 X 10^-28 (kg)/m^3`
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This equation provides an estimate of the mass desnity of the observable universe.
According to an article posted on the University of Massachusetts website 1 , "the mass density of visible matter (i.e., galaxies) in the Universe is estimated at `3 X 10^-28 "kg"/m^3`.