Supernova clarification | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
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Supernova clarification. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-life-death-tutorial/v/black-holes?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-life-death-tutorial/v/supernova-supernovae?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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How about the universe is expanding and the light needed even more than 6500 years to get to us, so the explosion happened even more than 7500 years ago?
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I like how u a tually clarify your vids.
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Also, it was so bright it could be seen during the daytime for quite a while. That's crazy.
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@FHomeBrew C'mon man thats too much to ask. U can be little more polite with ur tone, when talking to Sal.
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@FHomeBrew Universal expansion starts to matter when talking about cosmological scales (millions or billions of light years). With a Hubble Constant of 70 km/sec/Megaparsec, a point in space 6500 light years away would be traveling away from us at about 500km/hour which is nothing over a distance of 6500 light years. More importantly, within galaxies, gravity is keeping things from expanding away from each other.
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Asian astronomers i believe.
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- .- stop with that useless replying
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buttholes..
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@WatchMeRise13 First reply to the first fail of the first reply to the first reply to the first comment!
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@derickhaywood First reply to the first reply to the first comment!
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