The earth as a planet - Carl Sagan's 1977 Christmas Lectures 1/6

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What exists beyond Earth? Over six Lectures presented in 1977, American astronomer and cosmologist Carl Sagan explores the vast expanse of space that surrounds the third planet from the Sun.

This lecture was filmed at the Ri on Friday 02 Dec 1977.

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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, Carl 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 Carl Sagan's Lectures we have made huge advances in our understanding of our planet’s environment, climate, weather, geology and biology – as well as our relative place in the universe.

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CARL SAGAN'S 1977 CHRISTMAS LECTURES:

What exists beyond Earth? Over six Lectures presented in 1977, American astronomer and cosmologist Carl Sagan explores the vast expanse of space that surrounds the third planet from the Sun.

Life on Earth
Where at first we could only discern the size of our planet and some knowledge of its atmosphere and configuration, the evolution of planetary exploration has revealed not only intricate details of Earth’s climate and geology, but a multitude of stars and planets besides our own.

Beginning with a closer look at the world we inhabit, Carl explores of the diversity of life on our own planet and the building blocks behind it, before questioning whether the same organic chemistry is occurring on planets in the outer solar system.

The Red Planet
In Lecture three onwards, Carl takes a closer look at our neighbouring planet, Mars. From early interpretations of terrestrial life on its surface to the surprising discoveries made by NASA’s Viking Program, the Red Planet has become the focus of efforts to discern whether intelligent life exists elsewhere in the universe.

When Carl delivered his Lectures in the late 1970s, NASA had only just begun its Voyager program to the furthest planets in our solar system and no extra-solar planets were known to exist. Now, over three decades later, astronomers are looking at planets that lie beyond our solar system to ask the very same question we pondered over Mars: is there life out there?

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ABOUT THE CHRISTMAS LECTURES:

Set up by Michael Faraday when organised education for children was scarce, the Royal Institution CHRISTMAS LECTURES established an exciting new way of presenting science to young people. World-famous scientists have given the Lectures, including Nobel Prize winners William and Lawrence Bragg, Sir David Attenborough, Carl Sagan and Dame Nancy Rothwell.

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If only Dr. Sagan could've seen how the Voyager probes would surpass everyone's wildest expectations!

TheSteveBoyd
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It's such a treat to hear him speak.

emperorchopchop
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Thank you so much for uploading this to your channel!

SamVekemans
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I will forever be indebted to Sagan, for opening the real world of wonder and releasing me from the demon haunted fantasy

tonyevans
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Wow!...a real blast from the past, thank you!. Carl Sagan is one of my all time great intellectual mentors who captivated me as a curious kid back in the day. I loved his 'Cosmos' series so much that i bought the book with several weeks of saved up pocket money, and escaped to the edges of the Universe during long dark winter nights...it is a cherished memory of mine to this day.

GlassEyedDetectives
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Yes! I've been hanging out for the RI to release high quality versions of Carl Sagan's Christmas Lectures! It's so nice to see it without VHS tracking issues and sound in proper sync. Thank you :)

PBeringer
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Carl was always on a different level than everyone else – he was special. We've still not seen anything like him in all these years, and we lost him almost 30 years ago. I watch Cosmos at least once a year, and I have the original hardback book. He certainly changed my life for the better – I think he changed many lives. To all the parents out there: please let your kids watch these 6 Carl Sagan Christmas lectures – let their minds wander in the wonder of the universe.

reddevil
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"In lecture 6, we will be making an apple pie from scratch. It will take 14 billion years."

RFC
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Ah lads! This channel is an absolute treasure.
After the recent meteor shower, the nephew is a budding astronomer. Can't wait to pass this legend on.

inamortz
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🎉 What. A. Treat. Thanks RI! So glad I fixed my membership up again and discovered this was just released.

relwalretep
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Thankyou Royal Institution. I remember watching these exact lectures as a young boy and they sparked an interest in the universe that has lasted me a lifetime. Bless you.

davidmarshall
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I’m quite sure I won’t be the only one to say Bravo to all things Sagan. ❤

katherandefy
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By describing the Earth as a small, unimportant planet with a backward civilization, Carl Sagan was blowing up the egos of the people in the audience. The effect of this could be either nausea in the egotistical people who believe themselves to be very important or the intellectual estrangement that is an opening for the study, learning and development of science and philosophy. This is a guy at the top of the short list of Americans I admire.

fabiodeoliveiraribeiro
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I wish Carl Sagan had called me an excellent Earth person!

Thanks RI for uploading!

SolidGoat
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Wow, great thanks to the Royal Institution for publishing these superb lectures here on Youtube. Carl`s contibutions are outstanding.

derrymic
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Carl Sagan always was my hero. What would he have had to say that Pluto is not a planet anymore? (A decision I fully support, otherwise we would have hundreds of planets.)

NachtmahrNebenan
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Carl Sagan on a bad day still trumps today's science ambassadors

rvfinder
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In answer to the "dinner with any historical figure" question, my answer is always Carl Sagan, and Rod Serling. Both humanists and wonderful communicator.

billyhopkinson
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I never knew he spoke at the Royal Institution. It was great to watch him. My dad and I loved to watch him on public television. If anyone has not seen it yet, you should see the COSMOS series that Carl Sagan did. He talks about the earth, evolution, the solar system and the universe. Makes you think about the world as a whole, not divided.🔆🔅🔆🔅🔆

Davidmwalter
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Splendid! Thanks a ton for uploading this video!.. Indeed a treat to hear words of wisdom from Carl Segan!

rahulsp