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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 ρ

_{crit}? From that I can work out the volume using ρ=m/V.

Any help is appreciated.