Star A and star B have the same temperature, but star B is more luminous than star A. Whatcan you infer about these two stars?
A)Star A must be bigger.
B)Star B must be bigger.
C)Star A must be redder.
D)Star B must be redder.
E)Nothing can be inferred from the information given.

Question

Quizplus · Accepted Answer

Since the two stars have the same temperature, their difference in luminosity can only be due to their sizes. Star B must be bigger than star A in order to be more luminous. The luminosity of a star is directly related to its size, so if star B is more luminous than star A, it must be bigger. The temperature being the same suggests they are both of the same spectral type. There is no information provided about the color of either star, so choices C and D are not supported by the given data.

Star a and Star B Have the Same Temperature, but Star