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The sun is 1.5 x 10^11m away from earth. At what rate is the sun radiating energy? per meter squared on its surface.

The soloution is

1400 = E/(1.5* 10^11)^2

and that becomes 1400 / (1.5*10^11)^2 = E

THe inverse square law is I = 1/d^2. However this equation replaces 1 with the E. Could someone explain why this is done?