| 释义 |
RR Lyrae stars
基本例句
天琴RR型星
Lastly, sinceRR Lyrae starsall 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。 |