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Redshift is an effect created by light waves.
红移是光波产生的一种现象。
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。
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。
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。
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。当汽车开走时，喇叭的音高会发生变化。
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。
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。
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。
