The Stefan-Boltzmann Law is given by:
$P = A \sigma T^4$
where $P$ is the power radiated, $A$ is the surface area of the star, $\sigma$ is the Stefan-Boltzmann constant ($5.67 \times 10^{-8} \, W \cdot m^{-2} \cdot K^{-4}$), and $T$ is the temperature of the
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