Birth of stars | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
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Birth of Stars. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-life-death-tutorial/v/accreting-mass-due-to-gravity-simulation?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/scale-earth-galaxy-tutorial/v/hubble-image-of-galaxies?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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My question is ,is there anything Khan academy doesn't know?
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just think about that actually watch the video over and then think
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Fascinating
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If it takes certain amount of pressure and heat for nuclear fusion to happen then why stars are not the same size and some stars are smaller and some are much bigger ?
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What software did you use for making it?
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The energy released, is in the form of heat and light.
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4:10 Is this energy in the form of kinetic energy?
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stan says you're a cont, cont, cont, stan says you're a cont, cont WELL TELL STAN TO F OFF!!!
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great video but 'nucleuses' is killing me
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3.56: something is wrong there. 1 proton + 1 neutron, in fact, have greater mass than 2 protons. Neutron has greater mass than the proton. Must be another explanation for the energy release in fusion.
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Khan, do you believe in God?
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Hydrogen accretes. Reaches critical mass/temperature/pressure. Star switches on. Why do stars vary so greatly in size? Shouldn't they all be roughly as big as each other? Can anyone please explain, in simple terms.
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lolol
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I got told today i had to do a 10minute presentation on Stellar evolution. I may just link your videos! I've been using them that much to write the presentation!
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what about dark matter?
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Neutrons weigh SLIGHTLY more than protons so how come when the proton turns into a neutron, the two weight a little less than before? :S
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can u post a video about theory of relativity and time travel?
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@HatchetsNCleavers Pwnage. Seriously. I love you :3
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@crorens picture a a pileup in football. The more players are on top, the more the guy on the bottom is being pushed into the ground. Similarly, the way hydrogen condenses in a cloud, the particles on the outside shells exert additional pressure to the ones at the very center and eventually a reaction occurs.
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ok, so in the last video you said gravity is weaker than EM force, then how come they are able to come close enough? i mean shouldnt the stronger (EM) force repel them before the strong force kicks in?
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