EnvironmentOctober 1, 2006
Impact from the Deep
Strangling heat and gases emanating from the earth and sea, not asteroids, most likely caused several ancient mass extinctions. Could the same killer-greenhouse conditions build once again?
Stories by Peter D. Ward
The SciencesSeptember 18, 2006
Impact from the Deep: Overview/Mass Extinctions
Space & PhysicsOctober 1, 2001
Refuges for Life in a Hostile Universe
Only part of our galaxy . is fit for advanced life