Redshift is an effect created by light waves.

红移是光波产生的一种现象7EWhy.5#RDE20dGEI。

It causes the colour of an object to become redder as it moves away from an observer.

当物体远离观察者时，它会使物体的颜色变得更红[G@c)@%achqF(x.K。

This is because red light has the longest wavelength of all the colours on the visible spectrum.

这是因为红光在可见光谱中波长最长yKTihdWin)Z!yqR-。

Redshift is not something that humans often see, because an object must be travelling very fast to visibly change colour.

红移不是人类常能看到的东西，因为一个物体必须移动得非常快，人才能看到它颜色的变化#%]O-5^lKTS。

However, we can observe a similar effect with sound waves, when the pitch of a car horn changes as the car drives away.

但是，我们可以观察到声波产生的类似效果jn,#;h2a+kx#.ehq。当汽车开走时，喇叭的音高会发生变化czQ;rk_w7d|Z&G.aF#8。

Redshift is important because it has helped astronomers make observations about the universe.

红移很重要，因为它能帮助天文学家观测宇宙^hQ6Oz6#RvP#^l~dG。

In 1929, the redshift of galaxies caused astronomer Edwin Hubble to discover that the universe is expanding.

1929年，天文学家爱德文·哈勃正是通过许多星系的红移发现宇宙正在膨胀JM&GsS4s@Ib)l|8]3。

Today, astronomers also use redshift to find the locations of planets outside of our solar system.

如今，天文学家还利用红移来寻找太阳系外行星的位置r8F,Da!owIB_g2F4I。