From Dust to Life

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).

• 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 of the Moon 168 The Moon today 169 What the Moon is made of 170 The Moon's orbit 172 The fission theory 174 The capture hypothesis 175 The coaccretion hypothesis 176 The giant impact hypothesis 177 Encounter with Theia 179 Earth, Moon, and tidal forces 181 Late heavy bombardment 183 ELEVEN Earth, Cradle of Life 186 The Hadean era 186 The tree of life 191 The building blocks of life 193 The rise of oxygen 196 A favorable climate 199 Snowball Earth 202 Future habitability 204 TWELVE Worlds of Gas and Ice 205 Giants of the solar system 205 Building giants by core accretion 211 The disk instability model 214 Spin and tilt 215 Masters of many moons 217 Formation of regular satellites 219 The origin of irregular satellites 220 Rings 221 THIRTEEN What Happened to the Asteroid Belt? 225 The asteroid belt today 225 Ground down by collisions? 226 Emptied by gravity? 229 Asteroid families 231 The missing mantle problem 233 Asteroids revealed as worlds 236 FOURTEEN The Outermost Solar System 242 Where do comets come from? 242 Centaurs 246 Looking beyond Neptune 247 The Kuiper belt 248 Sedna 251 The nature of trans-Neptunian objects 252 Where have all the Plutos gone? 256 The Nice model 259 FIFTEEN Epilogue: Paradigms, Problems, and Predictions 263 The paradigm: solar system evolution in a nutshell 264 Unsolved puzzles 267 Searching the solar system for answers 268 Other planetary systems 271 Future evolution of the solar system 273 Glossary 277 Sources and Further Reading 291 Index 293

"[T]here is much solid information to be gleaned from careful reading."--Publishers Weekly "[A] stellar read."--Nature "In this grand chronicle of the science behind the origins of our 4.6-billion-year-old Solar System, John Chambers and Jacqueline Mitton peruse everything from the giant collision thought to have formed our Moon to the nature of meteorites."--Rosalind Metcalfe, Nature "This is not your average tour of our solar system. Using clear, relatively jargon-free language, Chambers and Mitton provide a comprehensive examination of our current understanding of its formation, which should readily appeal to the general reader who enjoys scientific detail without getting into equations."--Library Journal "I recently built an app about the solar system, and my research would have been made a lot easier if I had possessed a copy of this excellent book. It provides a truly comprehensive overview of our solar system's origins and is written in plain, jargon-free language."--Marcus Chown, New Scientist "Chambers and Mitton stay focused on the science in From Dust to Life: unlike other books that create narratives around the scientists, they discuss the science and the history of its development, rather than the individuals who made it possible. That's a worthwhile trade: while there have been, and are today, interesting people studying the formation of the solar system, the science is even more fascinating as we find out just how complex the process is to turn a cloud of gas and dust into a star and planets."--Jeff Foust, Space Review "[I]ncredibly thorough and detailed, yet very accessible to non-scientists too... [A] compelling overview of the evolution of the Solar System."--Katia Moskvitch, BBC Sky at Night "Read From Dust to Life to gain a fascinating perspective on the current state of the science behind solar system formation."--David Dickinson, Astro Guys blog "This wild ride across the cosmos and through time covers a lot of territory but isn't merely a laundry list of observations. Instead, readers will find one lucid explanation piggybacked onto another... The authors, a planetary scientist and a space science writer, make celestial mechanics comprehensible even to readers with more curiosity than scientific background. Yet there are still insights for those who regularly pore over the astronomy stories in Science News. Best of all, the authors help readers glimpse the why of it all."--Science News "This book ... is accessible to a scientifically literate general reader... The author team is eminently qualified ... one is a well-known planetary scientist and the other an experienced science writer. The result of their efforts is a highly readable book."--Star Formation Newsletter "Chambers and Mitton present a well-researched, detailed, big-picture overview of the solar system that shows how all of people's observations of its contents contribute to a coherent model for its origin. The authors place the modern theory and latest observations in historical context by beginning each chapter with an overview of the development of these scientific ideas from their beginning."--Choice "This book is up-to date, thorough, and authoritative. It revels in the latest discussions and controversies... It is a joy to read and is accessible to any student with a scientific background... Read this book. Join the cosmogonists and help change the cosmogony/cosmology ratio."--David W. Hughes, Observatory "For the interested amateur with a degree of familiarity with the topics under discussion, From Dust to Life furnishes a comprehensive overview of current models for the formation of the solar system... Genuinely exciting."--Cait MacPhee, Times Higher Education