born: in Poland in 1473 died : May 24, 1543
He was one of the first scientists to use mathematical observations to collect information. He believed
the sun is the center of the universe and the earth and other planets went around it.
Nine Planets In the Solar System
Before Copernicus’ theory
Showing Copernicus’ theory A diagram showing the solar system with I at its centre the sun
A diagram showing the solar system with r at its centre the earth
Read the text carefully, then answer these questions
(1)Why could he not tell about his theory? (Para 1)
Because the powerful Chistian Church would have punished him for even suggesting such an idea
(2) What was his theory about? (Para 1)
All his mathematical calculations led to the same conclusion: that the earth was not the centre of the solar system. Only if you put the sun there did the movements of the other planets in the sky make sense.
◆ lead to 导致，通向 1.All roads lead to Rome. 条条大道通罗马
2.The discovery of new evidence led to _______. C A. the thief having caught B. catch the thief C. the thief being caught D. the thief to be caught
◆ Only if you put the sun there did the movements
of the other planets in the sky . =The movements of the other planets in the sky make sense only if you put the sun there. eg. 1）Only if your identity has been checked, _____. D A. you are allowed in B. you will be allowed in C. will you allow in D. will you be allowed in 2）Only then did I realize the importance of knowledge. 3）Only in this way can we work out the maths problem.
“Only + 副词 /介词短语/状语从句” 位于句首, 句子要倒装。
(3) What had the astronomers noticed in the sky? (Para 2) They had noticed that some planets in the sky seemed to stop,move backward and then go forward in a loop. Others appeared brighter at times and less bright at others. (4) When did Copernicus complete his theory? (Para 3) Between 1510 and 1514 he worked on it, gradually improving his theory until he felt it was complete.
(5) How did he explain changes in the movement of the planets and in the brightness of the stars? When did he publish his idea? (Para 4) He placed a fixed sun at the centre of the solar system with the planets going round it and only the moon still going round the earth. He also suggested that the earth was spinning as it went round it and this explain changes in the movement of the planets and in the brightness of the stars. . He published it as he lay dying in 1543
(6) Why do people think that there is a direct link between his ideas and the work of Isaac Newton, Albert Einstein and Stephen Hawking?
Because his theory is now the base on which all our ideas of the universe are built. His theory replaced the Christian idea of gravity which said things fell to earth because God created the earth as the centre of the universe, He showed this was obviously wrong.
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