In this final episode, Dr. Carl Sagan reviews the previous episodes and how they relate to each other. What has history taught us? How did we get to the level of understanding we're at now? What's the best way to increase our knowledge of the Cosmos in the future? There have been big mistakes made by mankind in the past and as our knowledge increases our mistakes could lead to our destruction. How can we avoid that? He discusses the murder of Hypatia, the female scientist of ancient Alexandria, and the destruction of the Library of Alexandria, which was once the largest in the world. Dr. Sagan points out how vulnerable the Earth is to the toxic substances mankind churns out on a regular basis. The greenhouse effect, pollution, and nuclear weapons affect the earth, and have the capacity to damage the ecobalance, perhaps forever. He then brings up the subject of time travel, and winds up with his favorite topic, searching for life elsewhere in the universe.moreless
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 Jonathan Fahn |
Jean-Francois Champollion |
Ted Turner |
Himself |
Carl Sagan |
Himself (host) |
Jaromír Hanzlík |
Johannes Kepler |
Robert H. Goddard |
Himself |
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Who Speaks for Earth?
S 1 : Ep 13
Aired 12/21/80 (1:02:01)
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Encyclopedia Galactica
S 1 : Ep 12
Aired 12/14/80 (01:45)
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The Persistence of Memory
S 1 : Ep 11
Aired 12/7/80 (58:24)
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The Edge of Forever
S 1 : Ep 10
Aired 11/30/80 (1:03:06)
Season 1 Episodes
See AllEp 13
Who Speaks for Earth?
Ep 12
Encyclopedia Galactica
Ep 11
The Persistence of Memory
Ep 10
The Edge of Forever
Ep 9
The Lives of the Stars
Ep 8
Travels in Space and Time
Ep 7
The Backbone of Night
Ep 6
Travelers' Tales
Ep 5
Blues for a Red Planet
Ep 4
Heaven and Hell
Ep 3
The Harmony of the Worlds
Ep 2
One Voice in the Cosmic...
Ep 1
The Shores of the Cosmi...
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