When light loses energy its wavelength gets longer — that's what cosmological redshift is.

当光失去能量，它的波长会变长，这就是宇宙学的红移。

And this trend of distant galaxies moving away from us, and from one another, is called cosmological redshift.

这种遥远星系 远离我们、彼此远离的趋势被称为 宇宙学红移。