This is the best Christmas story ever! Carl speaks in this lecture in a way that kids can understand, (much more than with Cosmos) The YouTube related videos has the rest. ** 1977 Carl Sagan Christmas lectures 1, the earth as a planet. https://youtube/watch?v=BdXtjNSDi4s In his first Christmas Lecture, American astronomer and cosmologist Carl Sagan explores planet Earth and the place, scale and geometry of the pale blue dot in the Solar System. Sagan provides a unique insight into the history of our knowledge of the third planet from the Sun, formed 4.5 billion years ago. Using images and models of the planets in our Solar System, Sagan reveals how the heliocentric model of our universe, in which the Earth and planets revolve around the Sun, came to replace the earlier Aristotelian idea that our planet was at the centre and everything orbited around it. As the complexity of observational tools has developed from simple telescopes to complex spacecraft, so too has our understanding of the world we inhabit. Looking back on the evolution in space science in the years since Sagans lectures we have made huge advances in our understanding of our planets environment, climate, weather, geology and biology -- as well as our relative place in the universe. 1977 Carl Sagan Christmas Lectures 2, about the outer solar system and life. https://youtube/watch?v=iH7-gFOh8rE In his second Christmas Lecture, Carl Sagan travels beyond Earth to explore the possibility of life in outer space. To find the answer, he looks back to the early stages of the development of our atmosphere. The hydrogen from this atmosphere has since escaped to space from Earth, but not from bigger planets like Jupiter. When the hydrogen-rich gases of the early Earth are mixed together and supplied with energy, the essential molecular building blocks of the proteins and nucleic acids are formed. As Sagan suggests, although this process no longer occurs on Earth, such organic chemistry should be occurring in the outer solar system on Jupiter, and Titan, Saturns largest moon. The NASA twin spacecraft Voyager 1 and 2, launched a few months prior to these Lectures in 1977, were sent to space to explore this hypothesis. Part 3 https://youtube/playlist?list=PLPB-iUmwevW6NP-vf4qLeMCtnlfnF2HWV Part 4 Carl Sagan Planets Christmas Lectures: The History of Mars (Part 1/6) https://youtube/watch?v=Uah-84T7umA
Posted on: Wed, 24 Dec 2014 23:29:35 +0000
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