Unit 4 Astronomy: the science of the stars 1 How Life Began on the Earth Period 1 2 Science Subjects Physics Chemistry Biology Geology Mathematics Medicine Biochemistry Geophysics Astronomy 3 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 4 The Big Bang 5 The Solar system eight s ets other objects 6 7 Water Air Life Water is the headspring of life. ? 8 A cloud of bine into a solid ball Explode…with fire & rock (produce H2O, CO2,O2, N2, other gases) atmosphere Cool down water appeared dissolve harmful gases into … Life began Life developed 9 The development of life 10