Big bang introduction | Scale of the universe | Cosmology & Astronomy | Khan Academy
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Created by Sal Khan. Watch the next 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 Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/light-fundamental-forces/v/four-fundamental-forces?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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Fun Fact: The Big Bang Theory was devised by a Belgian Catholic priest named Fr. Georges Henri Joseph Édouard Lemaître.
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Please correct the video thumbnail from "Big Band" to "Big Bang"
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How the hell do you write so well with a mouse
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ive been looking for the correct explanation of big bang theory for a while.......this helps a lot.....thanks... :)
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Thanks. Playing this for the kids.
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The Big Bang theory could have been called the Big Bang Law. There is more evidence that proves the Big Bang than there is evidence to prove the theory of gravity. The only reason we don't call these things laws anymore is because we know there is more to be discovered, and eventually each theory will become a small subset of a larger truth. Calling it a law would imply there is nothing more to the picture
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but because light travels at a rate of speed it does look different from one way to the other.
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maybe its not that the universe is expanding but that it is like a 3 dimensional space and only the objects with in are moving and the ones we see one way are in fact the ones we see the opposite way?
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Is it Big Bang THEORY or HYPOTHESIS?.Kindly clarify...Thanks in advance.
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+ papa schulz i thought that Steven Hawkins came up with the big bang theory
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sorry man but he BBT is a load of crap it doesn t really make sense at all. Another thing i learned through my studies are that in any thing where theres a lot of theories it s better just to say that they don t know. This is unluckily one thing we will never know God wants us to see how great he is that all you need to know
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@Shaunt1 Quantam fluctuations of a vacuum, most likely. It doesn't violate laws of thermodynamics, definitely not the first.
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thanks for making this video Salman. I think it's wonderful that you make these videos, but I'm still going to tell you what I don't think makes sense in this one.
You talk about a 2D sphere in the beginning to set the stage for explaining how scientists look at space later. In my view what you are describing is not a 2D sphere. You draw on arrows with two heads sort of representing East-West, and North-South as the only directions available to you, and refer to this as proof that it is two dimensional. Well, the giant sphere we're all on, we think in terms of our movements as only have the options of moving some combination of East-West and North-South too. Of course, we are actually on a 3D sphere... because, while in our minds we decide to move, say in a North-East direction, we are also moving automatically in a third dimension with the curve of our big planetary sphere. We simply map a 2D grid onto our planet because it suffices for us to describe our motion in a way that is meaningful for practical purposes, but that does not change that we are moving in the third dimension. The same is so for the first sphere you drew in this video.
I don't mean this to be about nitpicking... there's a larger point to this that I think is constructive (and it's not a case for any religion). I think there's a large realm where our senses and reason do tremendous things for us. We view as far as we can with reason and senses, but we do all this and and have the option to say, "maybe there's a ?beyond? my sense and reason that just leaves me wondering." That is, if we take as a given that our sense and reason can have a "total view" of reality, maybe we end up not looking at reality, but spinning our wheels in tremendous cognitive contortions (abstract mathematics) to assert a "total view" where one may simply not exist (at least for us). Or put this another way... do any other species assume that their cortex can have a total view of reality? What if we have a partial view of the universe that is matters to us, means something to us, but we can only wonder if there is such a thing as a "total view?" -
The Big Bang is a universal expansion theory, not an origin theory. It does not explain how space, time, and matter were created.
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Fun Fact: A Catholic priest came up with the Big Bang Theory
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Thanks - Great Stuff
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About the shape of the universe. I know your video was only published in 2010, but for people wondering, there's much more up-to-date information.
According to NASA, "the universe was known to be flat to within about 15% accuracy prior to the WMAP results. WMAP has confirmed this result with very high accuracy and precision. We now know (as of 2013) that the universe is flat with only a 0.4% margin of error."
http://map.gsfc.nasa.gov/universe/uni_shape.html -
Three.... threeee .... threeeee dimensional space !!
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3:43, but this is a 3 dimensional model?
By the way, the Big Bang is worldwide classified as an expansion, not an explosion, because there are materials needed in order for an explosion to take place. But there was no matter or energy to start with, so the Big Bang was an expansion of the time and space continuum, and originated out of, yes, nothing. -
How do galaxies collide in a rapidly expanding universe?
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