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Text9.
W：Tom，what are you going to do in the future？
M：I want to be a scientist.
W：Can you tell me why？
M：I think scientists contribute a lot to our comfortable lives.I want to be a useful person.
W：Sounds great.Then who's your favorite scientist？
M：Copernicus.He discovered the sun was the center of the universe.And All the planets went around it.
Our ideas of the universe are all based on his theory.And his theory even influenced the work of the great scientists Like newton and einstein afterwards.
W：Wow I wonder how he made his discoveries
M：Well at his time，People believed the earth was the center of the universe.But if that was the case，
Some things didn't make sense.So Copernicus tried to find an answer.He collected observations of the stars
And used all his mathematical knowledge to study them That finally led to his theory.
W：Copernicus was great indeed.
M：That's for sure.But unluckily，he didn't publish his theory until he was dying.
W：How come
M：At that time the christian church was extremely strict about ideas.If copernicus put forward his theory，
The theory would certainly have been turned down.And He himself would have been attacked and punished too.
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