Contents --- Life Beyond the Earth
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Introduction
Life Zones and Suitable Stars for E.T.
Suitable Stars
Life Characteristics
Evolution by Natural Selection
Working Definition of Life
Extremophiles
Habitable Planets
Methane-based Life
Bio-Markers
Drake Equation: How Many Of Them Are Out There?
``Hailing Frequencies Open, Captain''
Fermi's Question (Fermi's Paradox)
Review Questions
References and Web Links
Astronomy Notes home
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