The measure of a star's brightness is called its___________ .
A) magnitude
B) luminosity
C) apparent light
D) both A and B

Question

Quizplus · Accepted Answer

Magnitude is a measure of a star's brightness as seen from Earth, while luminosity is a measure of its true brightness. Therefore, both magnitude and luminosity are measures of a star's brightness, so the correct answer is D for "both A and B." Apparent light is not a specific measure of a star's brightness.

The Measure of a Star's Brightness Is Called Its___________