Contents --- Life Beyond the Earth

• Introduction
• Life Zones and Suitable Stars for E.T.
  1. Suitable Stars
• Life Characteristics
  1. Evolution by Natural Selection
  2. Working Definition of Life
  3. 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