Ch01 Earth in Context

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essential of geology
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  Essentials of Geology, 4 th  edition, by Stephen Marshak © 2013, W. W. Norton Chapter 1: The Earth in Context   Introduction    Cosmology: the scientific study of the Universe.    Structure    History Earth 4 Part 1 Opener  Essentials of Geology, 4 th  edition, by Stephen Marshak © 2013, W. W. Norton Chapter 1: The Earth in Context      Universe is made up of matter   and energy.    Matter  —substance of the universe; takes up space.    Mass    Density    Weight    Energy  —the ability to do work.    Heat    Light    Pull of gravity What Is the Structure of the Universe? Fig. 1.2a  Essentials of Geology, 4 th  edition, by Stephen Marshak © 2013, W. W. Norton Chapter 1: The Earth in Context   Stars and Galaxies    Stars are immense balls of incandescent gas.    Gravity binds stars together into vast galaxies.    Over 100 billion galaxies exist in the visible universe.    The Solar System is on an arm of the Milky Way galaxy.    Our sun is one of 300 billion stars in the Milky Way. Fig. 1.2b, c  Essentials of Geology, 4 th  edition, by Stephen Marshak © 2013, W. W. Norton Chapter 1: The Earth in Context   The Nature of Our Solar System    Our sun is a medium-sized star, orbited by 8 planets.    The sun accounts for 99.8% of our solar system mass.    Planet—a planet:    Is a large solid body orbiting a star (the Sun).    Has a nearly spherical shape.    Has cleared its neighborhood of other objects (by gravity).    Moon—a solid body locked in orbit around a planet    Millions of asteroids, trillions of icy bodies orbit the sun.
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