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Origin and evolution of life
Meteorites, Comets and Asteroids
Outer solar system
Moon to Mars
Robotics & A.I
Image of the Day
Aug 19, 2002
Our debate panelists answer reader's questions about the possibility of complex life beyond Earth.
Fermi´s Paradox: Where Are They?
Jul 29, 2002
If there is intelligent life out there, why haven't we found it yet?
Lifetime of Complex Life
Jul 24, 2002
Stars grow hotter as they age, and habitable planets orbiting them become uninhabitable. How long can complex life flourish?
Odds of Complex Life
Jul 22, 2002
What are the conditions necessary for multi-cellular life and the speed at which it evolves?
How far away is our E.T neighbor?
Jul 17, 2002
How far away is our E.T. Neighbor? Our distinguished experts consider the likelihood of life elsewhere in our solar system.
Complex Life Elsewhere in the Universe?
Jul 15, 2002
The panelists ask whether the Earth's history provides us with examples of conditions that might be encountered on other planets.