Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
世界上只有两个东西是无限的,一为宇宙,一为人类的愚蠢,我所不能肯定的乃是前者。
Before the 15th century it was generally believed that the Earth was at the centre of the universe.
在15世纪以前,人们曾经普遍认为地球位于宇宙的中心
Mathematics is the language with which God has written the universe.
数学是神用来撰写宇宙的语言。
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.