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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
Empire of the Tsars
Empire of the Tsars

   2017    History
Human Universe
Human Universe

   2014    History
Walking with Cavemen
Walking with Cavemen

   2003    History
Motivation
Motivation

   2017    Culture
Secrets of the Dead
Secrets of the Dead

   2017    History
P.U.L.S.E
P.U.L.S.E

   2006    Art