Here ε is the emissivity of the object—how effective it is as a radiator (0 ε σ is the Stefan-Boltzmann constant, A is the surface area, and T is the temperature (in Kelvin). Since we have temperature to the fourth power, you can see that hotter things radiate much more power than cooler things.
OK, say you want to play Red Dead Redemption in space. Your computer is gonna get hot—maybe 200 F (366 Kelvin). To keep it simple, let’s say this is a cube-shaped PC with a total surface area of 1 square…

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