[<< wikibooks] English-Hanzi/Astronomers can use telescopes to look at very distant galaxies
Astronomers can use telescopes to look at very distant galaxies. This is how they see what the universe looked like a long time ago. This is because the light from distant parts of the universe takes a very long time to reach us.
天文学家可以使用望远镜观察非常遥远的星系。 他们看到的是宇宙很久以前的样子。 这是因为来自宇宙遥远地区的光需要很长时间才能到达我们。