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Calculate the approximate main-sequence lifetime of a (K0 type) star with a mass of 0.8 mass...

Calculate the approximate main-sequence lifetime of a (K0 type) star with a mass of 0.8 mass of Earth's sun, assuming only the inner 12% of the mass is converted into He via fusion. The luminosity of a K0 main-sequence star is about 0.55 of the Earth's sun.

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