Lastly, since RR Lyrae stars all have the same intrinsic brightness, identifying them and measuring how dim they appear tells how far they are, since faintness means farness.

• 最后，自从天琴RR型星都具有同样固有亮度，识别和测量它们的明暗程度就可以告诉我们它们距离我们有多远，越暗意味着距离我们越远。