
Comets
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In this extraordinary volume, David Levy shines his expert light on a subject that has long captivated our imaginations and fears, and demonstrates the need for our continued and rapt attention.
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Content
Preface GHOSTLY APPARITIONS IN THE NIGHT 11
One FROM DUST TO DUST 17
Two FOUR BILLION YEARS AGO 37
Three COMETS AND THE ORIGIN OF LIFE 57
Four THREE BILLION YEARS AGO 71
Five SIXTY-FIVE MILLION YEARS AGO 87
Six COMETS ARE DOUBLE-EDGED SWORDS 103
Seven EARTH'S FIRST COLD WAR 115
Eight A TIME FOR COMETS 125
Nine A FIELD OF DREAMS 139
Ten TARGET EARTH 153
Eleven THREE LITTLE WORLDS 173
Twelve PROBING FOR LIFE IN OUR GALAXY 185
Thirteen YES, VIRGINIA, COMETS DO HIT PLANETS 197
Fourteen PRESCRIPTION FOR DOOMSDAY 215
Fifteen AN EPILOGUE 231
NOTES 239
INDEX 245
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