退行速度的英文

recessional velocity

velocity of recession

例句与用法

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From the extent of the red shifts the recession velocities can be computed .
从红移量可以计算退行速度。
If the redshift is much less than 1 , we can calculate the receding velocity by the following formula
若红移z比1少得多则我们便可用以下公式找出星系的退行速度v ：
Continuing the above example , the galaxy is moving at a speed of about 9000km s away from us , given the speed of light is 3x10
把数值代入，便可以得出以上例子的星系退行速度为每秒九千公里。
513km s mpc , ie , for a celestial object 1 , 000 , 000 parsec away from us , its recession rate is 513km 1 parsec 3 . 26 light years
513 km s mpc ，即一个距离我们一百万秒差距的天体，它的退行速度是每秒513公里一秒差距3 . 26光年。
From hubble s law , we know that measurement of recession rate of celestial objects mostly clusters of galaxies and distances are the pre - requisites for the search of h
，先要测量出天体主要是星系团的退行速度和距离。哈勃本人在1929年给出第一个数值： h