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)size
B)distance from Earth
C)velocity
D)direction of motion
E)composition

Question

Quizplus · Accepted Answer

Cepheid Variables are used as standard candles to determine distances to other galaxies. By measuring the observed brightness of the star and comparing it to its known absolute magnitude, astronomers can determine the distance of the star from Earth through the inverse square law of light.

Cepheid Variables Are Stars Whose Brightness Varies in a Predictable