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1、Unit 4Unit 4 Astronomy: Astronomy: the science of the starsthe science of the starsthe first man in spaceYuri Gagarin The first man on the moonNeil Armstrong Russia 1961U.S.A. 1969is the scientific study of the universe and the heaven bodies (such as the sun, the moon, and stars), gas, and dust with
2、in it. eight planets many comets other objects How Life Began on the Earth ?How Life Began on the EarthA cloud of dustA cloud of dustCombine into a Combine into a solidsolid ball ballExplodeExplodewith fire & rockwith fire & rock(produce H(produce H2 2O, COO, CO2,2,OO2, 2, NN2, 2, other gases)other
3、gases) atmosphereatmosphereCool downCool downwater appearedwater appeared dissolve harmful gases into dissolve harmful gases into Life beganLife beganLife developedLife developedThe development of lifeThe development of lifeA cloud of dust a solid ball presence of water on the water shellfish & othe
4、r fish plants begin to grow on dry land insects and amphibians appear retiles appear dinosaurs appear mammals appearTheThe development of life development of lifesmall plants growon the water appearshellfish & other fishplants begin to grow on drylandinsects and amphibians appearreptiles appeardinosaurs appearmammals appearThank you very much.Good bye!