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Luminosity of our galaxy

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The total luminosity of the stars in our galaxy is L ≈ 2.3 × 1010 L?. Suppose that the luminosity of our galaxy has been constant for the past 10 Gyr. How much energy has our galaxy emitted in the form of starlight during that time? Most stars are poweredby the fusion of H into 4He, with the release of 28.4 MeV for every helium nucleus formed. How many helium nuclei have been created within stars in our galaxy over the course of the past 10 Gyr, assuming that the fusion of H into 4He is the only significant energy source? If the baryonic mass of our galaxy is 1011 M?, by what amount has the helium fraction Y ≡ ρ(4He)/ρb of our galaxy been increased over its primordial valueY4 = 0.24?

Reference no: EM132450725

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