const STEFAN_BOLTZMANN: 5.670374419e-8
Stefan–Boltzmann, W m⁻² K⁻⁴. Exact since the 2019 SI redefinition.
The bridge between a star's luminosity and a temperature at a distance, which is what sets a frost line, a sublimation radius and an equilibrium temperature — three different places in the generator that were each about to write it down separately.
packages/shared/src/units.ts:97