Here's why:
* Wien's Displacement Law: This law states that the wavelength at which a blackbody (like a star) emits the most radiation is inversely proportional to its temperature.
* Hotter Stars, Shorter Wavelengths: The hotter a star is, the shorter the wavelength of its peak emission. This means the peak of its light spectrum will be shifted towards the blue and ultraviolet portions of the electromagnetic spectrum.
* Example: A blue-hot star like Rigel (B8Ia) is much hotter than a red-cool star like Betelgeuse (M2Ia). Rigel emits its peak radiation at a much shorter wavelength than Betelgeuse.
In summary, the star with the highest temperature will emit the shortest wavelength of its peak frequency.
