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## Homework Statement

The energy density (energy per unit area per unit time) arriving from the sun at the surface of the earth is 1300 J/m2s. Calculate the mass loss of the sun in one year. (The earth is about 1.49 x 1011 m from the sun.)

## Homework Equations

ΔE = Δmc

^{2}

KE = (γ-1)mc

^{2}

## The Attempt at a Solution

I'm not sure how to calculate the loss of energy density from the sun as a function of distance. I feel like it can't be as easy as plugging the energy into E=mc

^{2}