北师大版高二Mdule7Unit20.ppt

Do you know the major discoveries of the scientists in the pictures? Albert Einstein He also discovered famous mathematical statement E=mc2 (energy equals mass times the speed of light squared). This statement or formula explained that a great amount of energy could come from a small piece of matter. Edwin Hubble And he proved that nebulae (星云) were galaxies themselves. Astronomers now agree that far distant galaxies do exist. To honor him, the first telescope was named after him. beautiful space Hubble space telescope 哈勃空间望远镜是人类第一座太空望远镜, 总长度超过13米, 质量为11吨多, 运行在地球大气层外缘离地面约600公里的轨道上。它大约每100分钟环绕地球一周。哈勃望远镜是由美国国家航空航天局和欧洲航天局合作, 于1990年发射入轨的。 哈勃望远镜是以天文学家爱德文·哈勃的名字命名的。按计划, 它将在2009年被詹姆斯韦布太空望远镜所取代。哈勃望远镜的角分辨率达到小于 0.1秒, 每天可以获取3到5G字节的数据。 Alexander Fleming (1881-1955) John William Mauchly (1907.8.30 – 1980.1.8) J. Presper Eckert 这是美国军方要求宾州大学莫奇来(Mauchly) 博士和他的学生爱克特(Eckert)设计的,准备用来计算炮弹及火箭、导弹的弹道,它最终在原子弹的研制中发挥了极大的作用。 On December 17th, 1903, they made the world’s first flight in a machine that was heavier than air and powered by an engine. Orville flew the plane thirty-nine meters. He was in the air for 12 seconds. Read the text and check your guesses from Exercise 2. Careful Reading 1. Einstein was at work when he thought of the equation “E=mc2 ”. This outspoken young man was rocking his one-year-old baby when he was suddenly inspired. “E=mc2”was born. 2. Einstein participated in the program that developed the nuclear bomb. 3. Einstein observed changes in time, size and mass. Einstein then showed in his “theory of relativity” that not even time, mass or length are constant ---they change according to our experience of them. 4. Hubble studied the universe for over twenty years. He began the long, slow process of exploring our galaxy. 5. Hubble discovered that our galaxy is bigger than we thought it was. He discovered small areas of mist which were in fact galaxies like own, millions of light years …than had previously been thought. 7. There was