幾箇世紀以來，天文學家相信銀河構成了整個宇宙。哈勃第一箇證明了通過望遠鏡看到的天空中的模糊花斑是其他星系，而不是銀河系的遙遠部分。

For centuries, astronomers believed that the Milky Way made up the entire universe. Hubble was among the first to show that the fuzzy patches in the sky seen through telescopes were other galaxies, not distant parts of the Milky Way.

Source: Tatoeba