Extra-Solar Civilizations

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How Many?

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01 Introduction 

02 The Calculation                            

03 Civilizations Now: 1

04 Civilizations Now: 2

05 Civilizations Now: 10,000

06 Civilizations Past: 1.1 Million

07 Civilizations Past: 110 Billion

08 Effect of Different Lifetimes

09 Theological Implications

10 Civilization Spacing

11 Two-Way Communication

12 One-Way Communication

13 Selecting SETI Targets 

  Multiple Lifetime Calculation   

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