哈伯定律

Hubble law

根据哈伯的观测，星系远离的速率 (v) 和它的距离 (d) 成正比，两者间的比率常数就是哈伯常数 (Ho)，而哈伯定律就是指 v = Ho．d。

Hubble's law:

The recessional speed of a galaxy is directly proportional to its distance from our galaxy. The further away a galaxy is, the faster it is moving away from our galaxy.

Hubble's Law is strong evidence for the Big Bang because it suggests that the Universe started expanding from a small starting point.