
\magnification=\magstep1


$$
L_{\rm star} \quad = \quad 4 \pi R_s^2 \sigma T_s^4
$$

$$
L_{\rm planet} \quad = \quad 4 \pi R_p^2 \sigma T_p^4
$$

$$
{\rm ratio\ of\ fluxes} \quad = \quad
                   {{L_{\rm planet}\over{L_{\rm star}}}}
            \quad =
            \quad 
                   { \left( { R_p^2 }\over{R_s^2 } \right) }
                   { \left( { T_p^4 }\over{T_s^4 } \right) }
$$


\bye
