Earth formation | Life on earth and in the universe | Cosmology & Astronomy | Khan Academy
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How the Earth is a the byproduct of a local supernova. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-universe/history-life-earth-tutorial/v/beginnings-of-life?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/earth-title-topic/v/apsidal-precession-perihelion-precession-and-milankovitch-cycles?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness! About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Cosmology & Astronomy channel: https://www.youtube.com/channel/UChNPnEkW8LYZ5Rwi8_A2-DA?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Comments
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Looking around and seeing hundreds of billions of similar stars in this galaxy and a hundred billion other galaxies- this supernova shock wave hypothesis, were it true, is so thin it would require its own shock wave to get it started.
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The above explanation is all science fiction. Maybe these events happened billions of years ago. Mostly likely these events did not occur. Hard to know what happened billions of years ago. These are somewhat informed guesses based on very limited information nothing more. The above explantions are not facts. This should be emphasized. There are millions of other possibilities for the formation of the solar system. More emphasis should be placed on the fact that the above explanations are nothing more than possible events that happened billions of years ago. More truth less pontificating for our students.
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I'm honestly just watching these videos for fun at this point.
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:)
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There is water all over the solar system. In the polar ice caps of Mars, in the rings of Saturn and its moons like Enceladus, the moons of Jupiter like Europa, and in vast numbers of comets and dwarf planets in the Kuiper belt like Pluto. Earth probably got most of its water from icy comets and planetesimals that bombarded the young planet back in the Hadean Eon.
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Great video. I'd just like to assert that the force that initiated the accretion of the planets was electromagnetism. Yes, all matter has gravity that is directly related to its mass, but tiny particles would not have enough gravity to attract each other in the beginning. Some of the collisions between the particles would have shifted their electrons into a more stable position and accretion could continue until the gravity became strong enough to attract more matter. Electromagnetism > Gravity
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FUCK YEAH:-)
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Oi
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cool!
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If I know history right then Japan has a mix of many religions.
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Good luck with that!
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Check out Eagle Nebula.
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Our solar system formed from a supernova. Heavy elements like oxygen are formed from supernovae. Hydrogen is the most abundant element. Put those two together and you get H2O.
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USA isn't the only ridiculously religious country. Trust me. I'm from Europe.
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You forgot maths :)
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can u talk about like differentiation and accretion
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Grammar Nazi
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And that's how Equestria was made!
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@justwanttocomment13 Try learning more about religion before you start spouting out about it, hm?
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Coming back to the water problem. Life started off in muddy ponds of boiling water as far as evolution is concerned. If the planet was hotter and ice comets did hit the plant why wouldn't they evaporate on entry? Also how much water would it take and at what rate would it take to cool the planet. Important trying to believe this theory but i have to use my imagination
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