1、必修 3Unit 4 Astronomy: the science of the stars注 : 另附 word 文档。点击此处链接Listen to Part 1.THEORIES OF GRAVITYMichael Jones of the New Space Magazine is talking with space traveller Li Yanping about changes in the theory of gravity.LY = Dr Li Yanping MJ = Michael JonesMJ: Hello, Dr Li Yanping. Its so good
2、of you to talk to me. Some _ ask uswhy things always fall back to _ if you throw them up in the air. Could you _ it?LY: Well, at first people thought it was because the earth was the _ of the universe. Of course that was _.One day Isaac Newton watched an _Listen again and fill in the blanks.students
3、earthexplaincentrewrongapplefall to the ground. He said that something else must be _ the appleback to earth. He called it “gravity”.MJ: I see. Did people _ his idea?LY: They did. Later they worked out that bigger _ (like the sun) have stronger gravity than _ objects (like our planets). If youre tra
4、velling in _ space, you couldnt fall back to the earth. Youre just too far _.pullingacceptobjectssmallerdeepawayListen to Part 2.MJ: Does it mean theres no _ in space?LY: No. In a spaceship you would feel the pull as it got _ to such an object. You would travel faster and faster _ it.MJ: Until you h
5、it it?LY: Not exactly. You may _ it very fast and then it would throw you out into space again. After that you would slowdown to the _ speed.Listen again and fill in the blanks.gravityclosertowardspassusualMJ: How do you know this?LY: In _ Einstein said that in space largeobjects make space-time ben
6、d; the larger the object, the _ space-timebends. So time goes _ in very strong gravity.MJ: What about _ holes?LY: Thats a place in space which has such a strong _ that nothing can escape _ its gravity. There is a kind of edge 1905furtherslowerblackmassfromaround this mass. If you cross over this edg
7、e, its _ for you to get back. However if you dont cross this edge, you can still _. Stephen Hawking has done a lot of _ into black holes. He has shown that they “spit” things out as _ as “eat” them.impossibleescaperesearchwellListen to Part 1.AN INTERVIEW WITH YANG LIWEIR = Mr Renault Y = Yang Liwei
