人教必修3Unit4Astronomy：thescienceofthestars.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit 4,Astronomy:,the science of the stars,the first man in space,Yuri Gagarin,The first man on the moon,Neil,Armstrong,Russia 1961,U.S.A.,1969,Astronomy,is the scientific study of the,universe,and the heaven bodies(such as the sun,the moon,and stars),gas,and dust within it.,astronomer,The Solar system,eight,planets,many comets,other objects,Pluto,Mercury,Mars,Venus,Saturn,Jupiter,Neptune,Uranus,Earth,How Life Began on the Earth,The Big Bang,Water,Air,Life,Water is the headspring of life.,?,How Life Began on the Earth,A cloud of dust,Combine into a,solid,ball,Explode,with fire&rock,(produce H,2,O,CO,2,O,2,N,2,other gases),atmosphere,Cool down,water appeared,dissolve harmful gases into,Life began,Life developed,The development of life,A cloud of dust,a solid ball,presence,of water,on the water,shellfish&other fish,plants begin to grow on dry land,insects and amphibians,appear,retiles appear,dinosaurs appear,mammals appear,The,development of life,small plants grow,on the water,appear,shellfish&other fish,plants begin to grow on dry,land,insects and,amphibians,appear,reptiles,appear,dinosaurs appear,mammals,appear,Thank you very much.,Good bye!,