Cosmos: Episode 4

Episode 4: "Heaven and Hell"

-Opening
-Heaven and Hell
-Tunguska Event
-Comets
-Collisions with Earth (Canterbury monks 1178)
-Planetary Evolution
-Venus
-Descent to Venus (Venera Landers)
-Human Impact on the Global Environment
-Deaths of Worlds
-Conclusion
-Cosmos Update 10 Years Later