From Dust to Life

List of Illustrations xi Preface xv ONE Cosmic Archaeology 1 A fascination with the past 1 A solar system to explain 3 Real worlds 9 Winding back the clock 12 Putting the pieces together 16 TWO Discovering the Solar System 19 Measuring the solar system 19 From wandering gods to geometrical constructions 22 The Sun takes center stage 25 Laws and order 27 Gravity rules 29 The missing planet 31 Asteroids enter the scene 34 Rocks in space 36 Uranus behaving badly 37 Completing the inventory 40 THREE An Evolving Solar System 43 A changing world 43 A nebulous idea begins to take shape 44 The nebular hypothesis in trouble 48 A chance encounter? 50 Nebular theory resurrected 54 FOUR The Question of Timing 56 Reading the cosmic clock 57 Early estimates: ingenious--but wrong 57 Geology versus physics 58 Radioactivity changes everything 61 Hubble and the age of the universe 63 How radioactive timers work 64 Meteorites hold the key 68 Dating the Sun 71 The age of the universe revisited 73 FIVE Meteorites 75 A dramatic entrance 75 Where do meteorites come from? 76 Irons and stones 80 Identifying the parents 83 Lunar and Martian meteorites 86 A rare and precious resource 87 What meteorites can tell us 88 SIX Cosmic Chemistry 92 Element 43: first a puzzle then a clue 92 An abundance of elements 94 The first elements 96 Cooking in the stellar furnace 98 Building heavier elements 104 Supernovae 105 SEVEN A Star Is Born 108 A child of the Milky Way 108 Where stars are born 110 First steps to a solar system 113 The solar system's birth environment 119 Essential ingredients 121 EIGHT Nursery for Planets 123 An excess of infrared 123 Two kinds of disks 125 Inside the solar nebula 129 Getting the dust to stick 131 The influence of gas 134 How to build planetesimals 135 The demise of the disk 137 NINE Worlds of Rock and Metal 140 Sisters but not twins 140 The era of planetesimals 141 Planetary embryos take over 144 The final four 147 Earth 148 Mercury 153 Venus 158 Mars 161 TEN the Making

John Chambers is a planetary scientist in the Department of Terrestrial Magnetism at the Carnegie Institution for Science. Jacqueline Mitton is a writer, editor, and media consultant in astronomy. Her books include Titan Unveiled: Saturn's Mysterious Moon Explored (Princeton).

"As an astrophysicist credentialed in the days before the space era, I figured reading another book on the solar system would be a big yawn. Surprise! I couldn't have been more wrong! Here is an eye-opening up-to-date reconnaissance of what's in our part of the universe and how it has evolved. Along the way, this arresting account reveals how unique our planetary system really is."--Owen Gingerich, Harvard-Smithsonian Center for Astrophysics