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Cosmos: A Spacetime Odyssey

Episode 11- The Immortals. This episode covers how life may have developed on Earth and the possibility of life on other planets. Tyson begins by explaining how the human development of writing systems enabled the transfer of information through generations, describing how Princess Enheduanna ca. 2280 BC would be one of the first to sign her name to her works, and how Gilgamesh collected stories, including that of Utnapishtim documenting a great flood comparable to the story of Noah's Ark. Tyson explains how DNA similarly records information to propagate life, and postulates theories of how DNA originated on Earth, including evolution from a shallow tide pool, or from the ejecta of meteor collisions from other planets. In the latter case, Tyson explains how comparing the composition of the Nakhla meteorite in 1911 to results collected by the Viking program demonstrated that material from Mars could transit to Earth, and the ability of some microbes to survive the harsh conditions of space. With the motions of solar systems through the galaxy over billions of years, life could conceivably propagate from planet to planet in the same manner.

Tyson then moves on to consider if life on other planets could exist. He explains how Project Diana performed in the 1940s showed that radio waves are able to travel in space, and that all of humanity's broadcast signals continue to radiate into space from our planet. Tyson notes that projects have since looked for similar signals potentially emanating from other solar systems. Tyson then explains that the development and lifespan of extraterrestrial civilizations must be considered for such detection to be realized. He notes that civilizations can be wiped out by cosmic events like supernovae, natural disasters such as the Toba disaster, or even self-destruct through war or other means, making probability estimates difficult. Tyson describes how elliptical galaxies, in which some of the oldest red dwarf stars exist, would offer the best chance of finding established civilizations. Tyson concludes that human intelligence properly applied should allow our species to avoid such disasters and enable us to migrate beyond the Earth before the Sun's eventual transformation into a red giant.
(from wikipedia.org)

Episode 11- The Immortals


Go to Cosmos: A Spacetime Odyssey Home or watch other episodes:

Episode 01 - Standing Up in the Milky Way
Episode 02 - Some of the Things that Molecules Do
Episode 03 - When Knowledge Conquered Fear
Episode 04 - A Sky Full of Ghosts
Episode 05 - Hiding in the Light
Episode 06 - Deeper, Deeper, Deeper Still
Episode 07 - The Clean Room
Episode 08 - Sisters of the Sun
Episode 09 - The Lost Worlds of Planet Earth
Episode 10 - The Electric Boy
Episode 11- The Immortals
Episode 12 - The World Set Free
Episode 13 - Unafraid of the Dark