A cool but very luminous star must have _______________.
A) a very large radius
B) a very small radius
C) a very small mass
D) a very low velocity

Question

Quizplus · Accepted Answer

A cool but very luminous star must have a very large radius because luminosity depends on both temperature and surface area (radius). A large radius can compensate for a lower temperature to produce high luminosity.

A Cool but Very Luminous Star Must Have _______________