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viii Contents Privatizing SETI «0.0.2... cee eee Other Wavelengths, Other Technologies ... Above the Clouds PROBABILITIES: THE ASTRONOMICAL FACTORS ...... Stars octet eee nett eee enna PROBABILITIES: LIFE ....... 00... c cece eens Miracle, Rare Accident, or Probable Event? ................. Chancists Versus Convergionists ................000000 eee Teleology and Self-Organization ..................00.200005 Gaia and Her Sisters ............0 0.0.0 c cece eee eee eee Extremophiles and Dual Biospheres .....................00. PROBABILITIES: LONGEVITY ...........0 0000 ccc e eee es How Long Do Technological Civilizations Live? The Shadow of the Bomb ........ 2.0... c cece eee 40 45 46 49 49 50 52 54 58 60 77 77 79 80 81 82 83 85 87 89 89 91 94 94 95 PROBABILITIES: CIVILIZATION, TECHNOLOGY,