退行速度
- 网络recession velocity;retreating velocity
退行速度-
Hubble（1929年）公布了遥远的星系退行速度正比于它们到我们的距离的划时代观测事实。
Hubble ( 1929 ) published the epochal observational fact that the receding speed of galaxies is proportional to their distances away from us .
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视界与退行速度大于光速的星系可否被观测到的问题
Horizon and the Question Whether Galaxies that Recede Faster Than Light are Observable
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从红移量可以计算退行速度。
From the extent of the red shifts the recession velocities can be computed .