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

Question

Quizplus · Accepted Answer

RR Lyrae stars are variable stars that are used as standard candles because they have a roughly constant luminosity of about 100 times that of the Sun, making them useful for measuring astronomical distances.

All RR Lyrae Stars Have About the Same