While the cycles of life and death flowed on Earth 65 million years ago, unbeknownst to the living things on the surface, death lurks in the ionosphere.
With thousands of asteroids, comets and other near-Earth object buzzing by our planet, Jorge Ribas finds out how we can avoid the same fate as the dinosaurs.
The Earth is in the middle of its sixth mass extinction. Kasey-Dee Gardner finds out why they happen in the first place, and how we can save our planet.
Why did the Earth's last super continent, Pangea, separate into the seven chucks we have today? Why do continents continue to shift about an inch a year? Discovery News' Kasey-Dee Gardner answers these questions and more.
74,000 years ago, a deadly firestorm called the Toba supervolcano ravages planet Earth. For the only time in history, mankind faces extinction. Can they survive the lethal onslaught of fire and ice?
Astrophysicist Andy Puckett explores the universe, especially undiscovered asteroids that could one day smack into our planet. Jorge Ribas gets the odds on our survival.