Activity 1: Revisiting the Habitability Concept Map
Activity 2: Extreme Life Card Game
Activity 3: How Much Life Is There in the Universe?

Science on the Internet

Extremophiles
Introduction to the Archaea
Life in Extreme Environments
Space.com Extremophiles: Not So Extreme?

Estimating Life in the Universe
PBS - Drake Equation
Astrobiology Magazine - The Drake Equation Revisited (Series in Five Parts)