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Great Impact Debate (5) The search for near-Earth asteroids, and the damage they may cause.
    Mars Terraforming (7) At the Astrobiology Science Conference on March 30, scientists and science fiction writers faced off in front of a packed audience to debate the promise and pitfalls of terraforming Mars.
Rare Earth Debates (6) Does the Earth's history give us examples of what conditions might be encountered either far or close to home?
    


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