\magnification = \magstep1

$$
{\rm flux\ } f \quad \sim \quad 3 \times 10^{-14} \ 
          {{\rm Joule}\over{\rm m^2 \thinspace s}}
$$

$$
R \quad = \quad v t  \quad = \quad 1.4 \times 10^{13} {\rm \ m }
$$

$$
L \quad \simeq \quad {4 \pi R^2} \ \sigma T^4
$$

$$
(m - M) \quad = \quad 5 \log(d) - 5
$$

$$
{\rm flux\ } f \quad = \quad {{L}\over{4 \pi d^2}}
$$



\bye
