What is the Cosmic Microwave Background Radiation? [Video] youtu.be/P_deJsiCNSk
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πŸ‘€︎ u/callum2703
πŸ“…︎ Feb 21 2021
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TIL of two AT&T technicians who won the Nobel Prize for accidentally discovering cosmic microwave background, an important foundation of cosmology, while trying to develop telecommunications technology. en.wikipedia.org/wiki/Dis…
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Can/Could we calculate the expansion rate of the universe by observing the increasing wavelength of the cosmic microwave background?

I understand that we can measure the redshift of galaxies moving away from us. Can we do this with the CMBR, too? If we can't do it now, would be theoretically possible in the future?

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AskScience AMA Series: We are Cosmologists, Experts on the Cosmic Microwave Background, Gravitational Lensing, the Structure of the Universe and much more! Ask Us Anything!

We are a bunch of cosmologists from the Cosmology from Home 2020 conference. Ask us anything, from our daily research to the organization of a large conference during COVID19! We have some special experts on

  • Inflation: The mind-bogglingly fast expansion of the Universe in a fraction of the first second. It turned tiny quantum fluctuation into the seeds for the galaxies and clusters we see today
  • The Cosmic Microwave background: The radiation reaching us from a few hundred thousand years after the Big Bang. It shows us how our universe was like, 13.4 billion years ago
  • Large Scale Structure: Matter in the Universe forms a "cosmic web" with clusters, filaments and voids. The positions of galaxies in the sky shows imprints of the physics in the early universe
  • Dark Matter: Most matter in the universe seems to be "Dark Matter", i.e. not noticeable through any means except for its effect on light and other matter via gravity
  • Gravitational Lensing: Matter in the universe bends the path of light. This allows us to "see" the (invisible) dark matter in the Universe and how it is distributed
  • And ask anything else you want to know!

Answering your questions tonight are

  • Alexandre Adler: u/bachpropagate I’m a PhD student in cosmology at Stockholm University. I mainly work on modeling sources of systematic errors for cosmic microwave background polarization experiments. You can find me on twitter @BachPropagate.
  • Alex Gough: u/acwgough PhD student: Analytic techniques for studying clustering into the nonlinear regime, and on how to develop clever statistics to extract cosmological information. Previous work on modelling galactic foregrounds for CMB physics. Twitter: @acwgough.
  • Arthur Tsang: u/onymous_ocelot Strong gravitational lensing and how we can use perturbations in lensed images to learn more about dark matter at smaller scales.
  • Benjamin Wallisch: Cosmological probes of particle physics, neutrinos, early universe, cosmological probes of inflation, cosmic microwave background, large-scale structure of the universe.
  • Giulia Giannini: u/astrowberries PhD student at IFAE in Spain. Studies weak lensing of distant galaxies as cosmological probes of dark energy.
  • Hayley Macpherson: u/cosmohay. Numerical (and general) relativity, and cosmological simulations of large-scale structure formation
  • Katie Mack: u/astro_katie. cosmology, dark matter, early universe, black holes, galaxy formation, end of universe
  • Robert Lilow: (theoretical models for the)
... keep reading on reddit ➑

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If the cosmic microwave background redshifted to its current frequency since its formation, does this mean that the photons were once visible to the naked eye, since the wavelength must have passed from very short wavelength to visible light to microwave wavelength?
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When the big bang theory is taught in school, why isn't the cosmic microwave background also explained?

Nobody, including myself, can remember being taught about the CMB when learning about the big bang. I find this odd given its importance as evidence of the big bang. This is US education, might not be the same everywhere.

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There's a signal from a previous universe in the Cosmic Microwave Background. Is it from a past hyper advanced intelligence? youtu.be/3vDvXMkK-gA
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πŸ“…︎ Oct 18 2020
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Chronon - Cosmic Microwave Background youtu.be/6G317b_H1mg
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πŸ“…︎ Feb 26 2021
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Help me understand the Cosmic Microwave Background Radiation

Note - I am not a student of physics, just someone curious. So I've been watching physics documentaries/youtube videos lately out of curiosity in an effort to better understand the universe. I've come across this idea of microwave background radiation, from what I have gathered it is the oldest light in the universe. I have a fair (although limited) understanding of what it is/how it came to be, but I can't wrap my head around how we're still able to detect it. Since it is photons that we are measuring, it seems to me that one of two scenarios explains why we can detect it today:

  1. The light that we are seeing is from an infinite source - we will always measure this radiation because the source was never "turned off" and continually emits photons

  2. Somehow, our location in space traveled faster than the speed of light to its current position where we are able to continue to measure the photons emitted from the source

Both of these thoughts seem naive and absurd, I simply ask: what is it that I'm missing, and why are these ideas wrong? I suspect that the expansion of space has something to do with this but I'm not sure. If my understanding is correct, this radiation existed everywhere in the universe as it cooled to the point where hydrogen could form and photons could travel without interference. But wouldn't the radiation eventually radiate out into the expanding universe, leaving matter traveling slower than the speed of light behind? Any insights from those more knowledgeable would be much appreciated :)

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πŸ‘€︎ u/Fakerabbit875
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Cosmic Microwave Background

Slipping through stars, the sensitive see

The surface last scattering, shifting red sea

Of relic radiation.

Soaking all space, transparent apparent, searching

Hindsight and fore for homogeneous heat

And errors so errant.

Harness Heaven and Hell, harmoniously,

Small Pockets of Hot spin, whole atomically,

In my microwave.

Center still freezing, the outskirts outburst

In the first thirty seconds, space caved into thirst

For photons

And protons and

Parts of all size

Recombine, decouple

My particle prize.

Focused like fulcrums, full crumbs fill

My mouth, making microwaved

Microwaves micro-meal stout.

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Does the cosmic microwave background radiation contain absorption lines?

I would think so because the early universe was almost pure hydrogen so I'd expect hydrogen lines to be taken out of it.

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πŸ‘€︎ u/The_Godlike_Zeus
πŸ“…︎ Dec 08 2020
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The Cosmic Microwave Background (through a filter)
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About 1% of the static on your television is caused by Cosmic Microwave Background (CMB) radiation left over from the Big Bang about 13.7 billion years ago
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Hawking Points in the Cosmic Microwave Background - a challenge to the concept of Inflation | Mathematical Institute maths.ox.ac.uk/node/36137
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Cosmic Microwave Background
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A tantalising hint of parity violation in the cosmic microwave background (technical video) youtube.com/watch?v=9W9rD…
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πŸ“…︎ Nov 23 2020
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Why does the cosmic microwave background permeate space instead of just the edges?

When we see light from the CMB, where is it coming from? What actually are we seeing?

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A tantalising hint of parity violation in the cosmic microwave background (technical video) youtu.be/9W9rDlEHg3c
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Does the Cosmic Microwave Background Radiation extend beyond the observable Universe?

I have trouble understanding what CMBR depicts.

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πŸ“…︎ Sep 29 2020
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ELI5: how can we see photons emitted at the time of the Big Bang (the Cosmic Microwave Background) if everything, including us, was contained within the same location during the Bang? Shouldn’t these photons be at the edge of the Universe by now?
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What would it mean for cosmology if we see the cosmic microwave background radiation (CMB) in near real-time?

Meaning, the light leaving it reaches our eyes almost instantly. Now, of course, if this were the case, the light leaving us would take near C/2 to get to the CMB.

And it's only near-instantaneous because it's so close to the edge of the universe (that means it's moving away from us very quickly (near the speed of light)).

Also, what if the opposite was true, what would that say about cosmology (what if it light traveling from the CMB was slowed down by a factor of almost 2)? What would these kinds of things say about the expansion of the universe and other cosmological models?

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TIL that the B/W dots that you see on TV, as well as the background "hiss" that you hear in-between radio channels are actually fragments of the Big Bang AKA "radiation leftover" or "cosmic microwave background radiation" universetoday.com/25560/t…
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Decided to map the Cosmic Microwave Background (CMB) back into a sphere streamable.com/bsl59
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[WP] If we take a large enough number of measurements, and use the Cosmic Microwave Background as a decryption key, we can find glimpses of messages in what we used to think was just quantum randomness
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what does the colors in the picture of cosmic microwave background represent? How can i duscuss/explain the picture better?
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πŸ‘€︎ u/AngryMademoiselle
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Cosmic Microwave Background
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Will we ever be able to "see" the cosmic microwave background radiation?

As I understand it, the cosmic background radiation leftover from the big bang is currently in the microwave spectrum, but is constantly redshifting as the universe expands; so logically that means eventually it will redshift enough to be in the visible spectrum. Does this mean that at some point in the distant future we will actually be able to see it with the naked eye, and what would this look like? (Assuming of course we survive that long as a species)

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The Planck satellite’s map of the cosmic microwave background.
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AskScience AMA Series: We are Cosmologists, Experts on the Cosmic Microwave Background, Gravitational Lensing, the Structure of the Universe and much more! Ask Us Anything! reddit.com/r/askscience/c…
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TIL about the "Axis of evil" | Observations of the cosmic microwave background radiation have observed several anomalies that seem to put our solar system as the "center", specifically in that our "top half" of the CMB is slightly cooler than the "bottom half". This is as of yet unexplained. en.wikipedia.org/wiki/Axi…
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A world map I made based on the data obtained by mutiple spacecrafts of the radiation signatures of the Cosmic Microwave Background Radiation
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The "Cosmic" Microwave Background - Bad Science! [Sky Scholar] youtube.com/watch?v=O13Ap…
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Is there any theory that predicted the Cosmic Microwave Background Radiation before it was measured?

I know that there are theories that talk about how the Universe was 1 second/3 minutes/10 years/ etc... after the Big Bang. Did any of those theories predict the CMB? Was there ever any reason to expect anything like it before we discovered it?

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πŸ“…︎ May 31 2020
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