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 his idea 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. 单词： 1. contribute vt. 1. Everyone is willing to contribute food and clothing

　　to the homeless people. 2. Plenty of fresh air contributes to good health. [点拨]contribute v.____________________，如句1； contribute to_______________

　　如句2 。 [拓展] contribution n. 贡献； 捐款 make a contribution/contributions to对……作出贡献 They have made outstanding contributions

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