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Heaven and Hell

   1980    Science
Sagan discusses comets and asteroids as planetary impactors, giving recent examples of the Tunguska event and a lunar impact described by Canterbury monks in 1178. It moves to a description of the environment of Venus, from the previous fantastic theories of people such as Immanuel Velikovsky to the information gained by the Venera landers and its implications for Earth's greenhouse effect. The Cosmos Update highlights the connection to global warming.
Series: Cosmos
The Crusades
The Crusades

   2012    History
Dinosaur Planet
Dinosaur Planet

   2003    Science
Top Gear
Top Gear

   2012    Technology
Bronze Age
Bronze Age

   2016    History
Empire of the Tsars
Empire of the Tsars

   2017    History
Human Universe
Human Universe

   2014    History