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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
Life
Life

   2009    Nature
Survivors Guide to Prison
Survivors Guide to Prison

   2018    Culture
The Crusades
The Crusades

   2012    History
How to Stay Young
How to Stay Young

   2016    Medicine
Wings
Wings

      Nature
Galapagos
Galapagos

   2006    Nature
Motivation
Motivation

   2017    Culture
Wild South America
Wild South America

   2005    Nature