1. Man's bounden duty is to explore the truth bravely.

Copernicus

2. French astronomer arago once said, "If we don't see objects falling all the time, gravity will be a very strange phenomenon for us."

Sagan once said: "Everyone is a scientist when he is young, because every child, like a scientist, is full of curiosity and awe of the wonders of nature.

Zhang Heng, a great astronomer in the Han Dynasty, once said, "What do you get if you work hard and don't ask for anything in return?"

5. Astronomer Zhang Heng once said, "Don't be disrespected by position, be disrespected by virtue; Don't be ashamed of your lack of cooperation and knowledge. "