This is the Earth, at a time when dinosaurs roamed a lush and fertile planet. A peace of rock just six mile wide, changed all that. It hit with the force of 10,000 nuclear weapons. A trillion tons of dirt and rock hurtled into the atmosphere, creating a suffocating blanket of dust. The Sun was powerless to penetrate for a thousand years. It happened before, it will happen again. Its just a question of when.