The formula is:
E = σ * e * A * T^4
where:
E is the total energy radiated per second,
σ is the Stefan-Boltzmann constant (5.67 x 10^-8 W m^-2 K^-4),
e is the emissivity of the body (for the Sun, it's 0.986),
A is the surface area of the body,
T is the absolute
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