The Sun emits electromagnetic waves (including light) equally in all directions. The intensity of the waves at the Earth's upper atmosphere is 1.4 kW/m2. At what rate does the Sun emit electromagnetic waves? (In other words, what is the power output?) I = P/A I know I need to convert 1.4kW/m^2 ==> 1400W/m^2 Then I set that value = to P/A What I'm unclear about is, what is the Area I am supposed to insert in the equation?