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| Part 3: Odds of Complex Life |
| Topic: Meteorites, Comets and Asteroids |
07/22/02 |
| What are the conditions necessary for multi-cellular life and the speed at which it evolves? |
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| Part 4: Lifetime of Complex Life |
| Topic: Spaceship Earth |
07/24/02 |
Stars grow hotter as they age, and habitable planets orbiting them become uninhabitable. How long can complex life flourish?
Currently named “Relentless Evolution” |
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| Part 6: Encore |
| Topic: Origin & Evolution of Life |
08/19/02 |
| Our debate panelists answer reader's questions about the possibility of complex life beyond Earth. |
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