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Homework Statement
Suppose the sun weighs ##2 \times 10^{30} kg##, calculate the maximum possible number density of stars in the present universe, if all the baryons in the universe were assembled into solar mass stars, and ##\Omega_b = 0.05## today.
Homework Equations
##n=\frac{N}{(4/3) \pi R^3}##
##\Omega = \frac{\rho_{matter}}{\rho_{critical}}##
The Attempt at a Solution
I think the number density of stars is given by the number of stars / volume. But how do we calculate N, the number of stars?
And what are the densities ρ and ρcrit? From that I can work out the volume using ρ=m/V.
Any help is appreciated.