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. 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. 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. 2280 BCE 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 begins by explaining how the human development of writing systems enabled the transfer of information through generations, describing how Princess Enheduanna ca. This episode covers the nature of how life may have developed on Earth and the possibility of life on other planets. The episode also presents the hypothesis of panspermia, where the origin of life is attributed to comets or asteroids carrying radiation-resistant organisms. The episode explores the possibility of the interstellar spread of life and possible alien encounters. The episode was written by Ann Druyan and Steven Soter, and directed by Brannon Braga.

It premiered on May 18, 2014, on Fox, and aired on May 19, 2014, on National Geographic Channel. ' The Immortals' is the eleventh episode of the American documentary television series Cosmos: A Spacetime Odyssey. 11th episode of the first season of Cosmos: A Spacetime Odyssey ' The Immortals'

Cosmos a spacetime odyssey fox