Radius of observable universe (correction) | Cosmology & Astronomy | Khan Academy
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(Correction) Radius of Observable Universe. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/red-shift?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/radius-of-observable-universe?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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I didn't confuse those terms. In what theory is the (visible) universe several million light years across 300,000 years after the Big Bang? None that I know of. Besides that was not the point he was making. He does fantastic work, but errors happen...
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Light years is a measure of distance, not time. Years is a measure of time, not distance. It is an easy mistake. And "Space" can expand faster than light can travel. That is what he is explaining. It's counter intuitive to our brains, I know. But it is reality. The terms are also easy to confuse.
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Plus 300,000 years after the Big Bang a distance of several million light years between two objects wouldn't have been possible.
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I honestly thought 13.4 = 13.7.... lol
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a bit anal retentive if you ask me
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i enjoy every video that you post
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haha funny, I noticed that when you were dealing with billions and hundreds of thousands etc. but I think it would be fairly obvious to most people that it was just a small error. (It was still 3 orders of magnitude out, but hey. No big deal) Enjoying these vids very much - I'm looking forward to when you explain olbers' paradox - That'll be fun. Just kiddin.
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Yeah, I was confused
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