Will you believe it when someone says the Earth is the center of the universe and it does not move at all? 如果有人和你说地球是宇宙的中心，它不会转动，你会相信吗？

Of course, you won't. 你当然不会信。

About 500 years ago, people thought that the Earth was the center of the universe. 大约500年前，人们认为地球是宇宙的中心。

And other stars and planets circled around the Earth. 其他的星星行星都围绕着地球。

However, someone found that the Earth was not the center of the universe. 但有些人发现了地球不是宇宙的中心。

Who was it? It was Galileo Galilei. 谁发现的？伽利略·伽利莱。

Probably many people are familiar with his name. 人们或许会对这个名字很熟悉。

Galileo Galilei was an Italian scientist. 伽利略·伽利莱是意大利科学家。

He found that the Earth moved. 他发现地球会转动。