事实上，从那以后，当天文学家无法找到更直接的测量星系距离的方法时，他们会以红移来代替。
In fact, ever since the discovery of this phenomenon, whenever astronomers cannot measure a galaxy's distance more directly they instead give an estimate using its redshift as a proxy.
造父变星是可靠的宇宙距离(测量)里程碑，其完整的一个光变周期直接反映了星体的本质光亮度。
Cepheids are reliable cosmic distance mileposts. The interval it takes for the Cepheid to complete one pulsation is a direct indication of the stars'; s intrinsic brightness.
通常以椭球面作为计算基准面，而测量得到的直线距离不能直接用于椭球面计算。
An ellipsoid is usually chosen for data processing since observed space distance could not be used directly.
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