Cosmology, K=0, Matter dominated, energy density

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Homework Statement



For K=0 of matter dominated universe, i.e at z>>1, find the enery density of starlight if f portion of matter condensed in solar type stars and the stars are uniformly distributed in space.

Homework Equations



Friedman eqn:

[tex]\rho_m = \frac{3H^2}{8 \pi G}[/tex]


The Attempt at a Solution



This is homework, so i do not want someone simply to solve it for me. My concern is what do they mean by the energy density of starlight? And is it not the same as proper energy density that i brought above in Friedmann equation? (The notion for this energy density was U*). I need some hints. Thanks!
 

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