SETI-SETR Appendix

star field

Appendix 1

How Many Extra Solar Civilizations?

Contents

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

Appendix

Multiple Lifetime Calculation

 

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