Hubble was able to resolve six variable stars in M31.
哈勃望远镜能分辨梅西叶星云星团表31中六颗变星。
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In 1925, when Edwin Hubble looked at the brightness of variable stars in a smudge called Andromeda, they appeared much dimmer than their pulsing rate predicted, and Hubble realized these stars were too far away to be in the MilkyWay.
1925 年当 Edwin Hubble 看着仙女座星体中各种变星的亮度,发现它的亮度比预测的要暗的多,并且 Hubble 也认识到这些恒星在很远的地方,不可是在银河系内。