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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
Chemistry
Chemistry

   2010    Science
Motivation
Motivation

   2017    Culture
Natural World
Natural World

   2009    Nature
Catalyst
Catalyst

   2017    Science
The Art of Russia
The Art of Russia

   2009    Art
Seven Ages of Rock
Seven Ages of Rock

   2007    Art
Evolution
Evolution

   2004    Science