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Answer :
In astrophysics, Eddington's standard model predicts that the mass of a star is directly proportional to the pressure of radiation in the star's interior and that the pressure of radiation is proportional to the star's luminosity.
Furthermore, the standard model proposes that the pressure of radiation is the force that maintains the star's equilibrium against gravity. This model predicts that the relationship between a star's mass and luminosity will follow a power law with an exponent of 3. A discrepancy between the theoretical and observed relationship between a star's mass and luminosity has been noted in many cases.
The relationship appears to be steeper than expected, with an exponent of 3.5 instead of 3.
The reasons for this discrepancy are not yet fully understood, but several factors may contribute to it. One possibility is that the luminosity of a star is not determined solely by its mass but also by other factors such as rotation, magnetic fields, and chemical composition. Another possibility is that the pressure of radiation is not the only force maintaining a star's equilibrium against gravity, and that other forces such as gas pressure may also play a role.
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