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,发现它们的亮度比预测的要暗的多,并且 Hubble 也认识到这些恒星在一个很远的地方,不可能是在银河系内。