Cosmic background radiation 2 | Scale of the universe | Cosmology & Astronomy | Khan Academy
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Cosmic Background Radiation 2 - Redshift of the Cosmic Background Radiation. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/hubble-s-law?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/cosmic-background-radiation?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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In the previous vid, there is the massive imposition of statement that there is a Big Bang, and all matter "somehow squashed into a matter-singularity pukes out and we have all the current 13.7 BYA event.
From white hot plasma, to microwaves, to radio waves, to light, and matter, we look in all 360x360 directions and see receding galactic edges.
If we accept this statement then somewhere with advanced technology we should be able to eventually see past the white hot plasma to the pre-BB and there would only be darkness. This would look like to us at the center radius darkness-plasma-waves-light-material world/universe-light-waves-plasma-darkness.
The only rational reason for such a non-Big Bang, but a Big Spew is that the dark matter on the space-time continuum, the physicist's "foam" started a white hole that spewed out quarks in a central point and that these are this singular event that eventually formed this universe's 13.7 B light year radius x 2 diameter of our visual universe.
Who is the arrogant person to believe that there is a singular event on the dark matter universe of dark matter, energies, and forces. Shades of earth being the center of the universe, as you say all matter is receding away from "us." The Big Bang started with Planet Earth!
How about multiple universes, that also at 13.7 BYA formed long ago, and that the dark matter universe that is said to be 95-99% of the actual "mass" universe, and 1-5% of the actual visual physical matter universe. As each white hole manifesting across this dark matter (in ~whatever~ shape the foam looked/looks like) there are multiple universes that we will never see or know about ... until we look past the white hot plasma and original darkness of 13.7 B light years distance. And then we will come upon a massive white hot plasma surface ... that we will not be able to tell if it is our universe, or another universe (of their own expanding 13.7 B light year universe.
Take a plastic weave fabric, like a JoAnn Fabrics store embroidery sheet. Put a flashlight behind that and all those holes in the plastic sheet are white holes emitting photons. Each, if this embroidery sheet then expanded across this space-time "foam" would be the dark matter universe hiding behind our physical matter universe.
We would then see 2 universes, unique and individual ever expanding outward in reference to each other (and all the rest of the other unlimited universes). This picture would then look like
darkness-plasma-waves-light-matter-light-waves-plasma-darkness attached to the other universe of darkness-plasma-waves-light-matter-light-waves-plasma-darkness, and so on.
We live amongst a massive creation of pin-prick universes on a divine quantum level, as only a small cosmic fart in the entire scheme of manifestation.
And you can take that same embroidery sheet and turn it into a ever-expanding sphere, and we can be on the entire inside surface of that cosmic balloon, or on the outside surface. We might be able to eventually see ONLY the entire inside of our singular universe of plasma, and if we traced it around 360x360 we could eventually find ourselves looking outward into the cosmos, we are looking at the left side, right side, or back of our heads.
The true representation of the dark matter world is 3D, everything science does and shows us is 2D and that really misdirects the truth of reality. 2D planar geometry of a circle and a square, is far different than 3D spatial geometry of a sphere and a cube.
Think with accuracy and you will see that the definition of a Big Bang is wrong, and should be a white hole Big Spew, ... and unlimited spews across an even bigger and unknown expanse of "space" or the dark universe. -
I like the way you explain , but you should calm down a bit
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what happens when this light becomes more red shifted? it won't reach us any longer? does he suggest that there will be no more microwave radiation coming from 13.7 billion years ago when the universe will have expanded quite a lot?
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Can someone tell me how we know that we formed in the middle of this hydrogen haze? He assumes this because if we were to be formed outside of the hydrogen haze then we would not expect to see uniform radiation around us. Does anyone see what I am saying? Since the universe is expanding, after this light was emitted from the hydrogen haze, we very well could have formed outside of where this haze was, so we would only be seeing a semi sphere of background radiation...
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The expansion of the universe is accelerating.
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But why IS the cosmic radiation now exactly redshifted?
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It's not the "Universe" that is expanding, it's SPACE that has been expanding, and yes, the radiation will eventually reach us. Yes, the expansion of "space" is exponential, I can send you to a website that explains it further, if you wish :)
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It already has.
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nothing can travel faster than the speed of light within space...however space itself can expand faster than light. so yes the universe is expanding much faster than the speed of light.
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I don't understand how the universe expands. Is is like blowing up a balloon, where the outside of the balloon is the matter? Because that doesn't make sense, because there will only be stars when looking at some directions. But it is neither like the expanding of compressed gass, because particles on the outside will move faster than on the inside, and that is not what we are seeing. Does someone knows the answer?
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When you talk about that the light from the "green guy" will never reach us, does that imply that the expansion the universe will exceed lightspeed?
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The WMAP picture shows temperature differences. Red and yellow areas are warmer and the green & blue areas are cooler. But where does it have more matter and will form stars and galaxies? And where will it be empty space?
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wow, eventually we won't be able to see other galaxies after awhile! how does this expansion apply to galaxies that are within a group or supercluster? will they stay around or drift away as well?
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You are a blessed individual and your lectures have helped me soo much :)
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maybe the big bang wasnt the universe expanding, maybe it was all of the particles shrinking o_0
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the universe expanding so much that we cant perceive the radiation anymore implies that it will eventually expand faster than the speed of light which is supposedly impossible
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*you draw circles well
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Me to
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I am in 8th grade, and i understood this.
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its not to say that we will have to wait billions of years for this to happen. It depends on the distance of the star.
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