We unpack the Eddington luminosity—the balance between radiation pressure and gravity that keeps stars and accreting black holes from blowing apart. From the original electron-scattering calculation to the refined opacity-inclusive limit, and into the wild realm of super-Eddington phenomena like Eta Carinae and ULXs, we explore how objects can push, bend, or even exceed this limit. Learn about porosity, photon bubbles, and advection as ways to shine beyond the limit, and what the Humphreys–Davidson boundary means observationally—and why these edge cases drive new physics.

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