We know that the energy emitted by a star is given by the Stefan-Boltzmann Law: $P = A \sigma T^4$, where $P$ is the power (energy per second), $A$ is the surface area, $\sigma$ is the Stefan-Boltzmann constant ($5.67 \times 10^{-8} \mathrm{W m^{-2} K^{-4}}$), and
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