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.
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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。
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