Cepheid Variables are stars whose brightness varies in a predictable manner so that the absolute magnitude of the star can be determined, and this allows the ___________of the star to be determined.
A) distance from Earth
B) size
C) direction of motion
D) composition
E) velocity

Question

Quizplus · Accepted Answer

The predictable variation in brightness of Cepheid Variables is directly related to their intrinsic luminosity. By observing their apparent brightness, their distance can be calculated using the inverse-square law of light. Therefore, the best choice is distance from Earth.

Cepheid Variables Are Stars Whose Brightness Varies in a Predictable