All RR Lyrae stars have about the same:
A)period of six hours.
B)distance of 32 light-years.
C)galactic location and speed.
D)luminosity of about 100 Suns.
E)locations in the centers of globular star clusters.

Question

Quizplus · Accepted Answer

RR Lyrae stars are variable stars that are used as standard candles to measure distances in the universe. They are known for having approximately the same intrinsic brightness, or luminosity, which is about 100 times that of the Sun. This characteristic luminosity allows astronomers to use them to measure distances to globular clusters and other regions of the Milky Way.

All RR Lyrae Stars Have About the Same