Killer Asteroids

66 million years ago, an asteroid impact triggered the fifth mass extinction, wiping out 75% of life on Earth, including the dinosaurs. Scientists warn of an inevitable future collision. 66 million years ago, an asteroid impact triggered the fifth mass extinction, wiping out 75% of life on Earth, including the dinosaurs. Scientists warn of an inevitable future collision. 66 million years ago, an asteroid impact triggered the fifth mass extinction, wiping out 75% of life on Earth, including the dinosaurs. Scientists warn of an inevitable future collision. 66 million years ago, an asteroid impact triggered the fifth mass extinction, wiping out 75% of life on Earth, including the dinosaurs. Scientists warn of an inevitable future collision.