What fundamental principle governs the relationship between a star's temperature and the wavelength of light it emits most strongly?

Answer

Principles of blackbody radiation

The relationship between an object's temperature and the peak wavelength of light it radiates is dictated by the principles of blackbody radiation; as temperature increases, the peak emission wavelength shortens.

What fundamental principle governs the relationship between a star's temperature and the wavelength of light it emits most strongly?
physicsastronomytemperaturestarshottest