Two stars have the same luminosity. Star X is spectral type F, while Star Y is spectral type K. Star X must be larger in radius than Star Y.

Question

Quizplus · Accepted Answer

The spectral type of a star is related to its surface temperature, with F stars being hotter than K stars. However, the radius of a star is also dependent on its mass, with more massive stars having larger radii. Therefore, we cannot determine which star is larger in radius solely based on their spectral types having the same luminosity.

Two Stars Have the Same Luminosity