Questions tagged [big-bang-theory]
Questions regarding the currently prevalent cosmological model for the origin of the universe.
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Is there a good Big Bang visualization (similar level of precision as the one they did for a proton)?
I watched a video visualising the proton.
Is there something similar for the Big Bang? So far I've seen only those, where the bright explosion kind of happens (and dies out) at a single spot, instead ...
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Why no Big Bang are happening now?
Why we are not able to see any Big Bang now? There is a possibility, I think.
Is it that Universe is so large that the probability of it's happening in the observable universe is almost zero, or is ...
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Big bang cosmology [closed]
What is the main evidence that the Big Bang is real. Why can we know that the big bang exists. In a short summary,
the evidence? In your owns words?
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Was the Big Bang an event within a preexisting Universe, or did it mark the beginning of the entire Universe, beyond just the observable Universe?
Could it be that the Universe is truly infinite, and the Big Bang was merely a singular, specific event that resulted in the birth of a 'bubble,' i.e. what we perceive as 'the observable universe'? ...
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Big Bang vs movements within a supercluster
Hubble measured the velocity of galaxies relative to Earth and determined that the galaxies were moving away from Earth. Speed increased with distance to Earth.
This correlates well with the Big Bang ...
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Are we really 13.8 billion light years from the big bang
Scientists tell us that the rate of expansion was once up to six times the speed of light. It then slowed down, by how much I am not sure. Now it is increasing again. The big bang happened 13.8 ...
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Could the Methuselah star be evidence that there was a universe before this one?
If the Methuselah star proved to be older than the universe could it be from a previous big bang big crunch cycle in which not everything was crunched? What would be the smallest radius the universe ...
user52681
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Could vacuum expansion arising from the Big Bang be a consequence of entanglement?
The model assumed here is that the vacuum is a coherent 4-d manifold, embedded in a background of quantum spacetime “foam”, or bulk. It is further assumed the bulk is itself disentangled, possessing ...
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Is dark matter made from the particles that had charge but no mass in the early part of the Big Bang
It is assumed that massless charged particles acquired mass after the early phase of the Big Bang. But could most charged particles be massless now as dark matter. They wouldn't interact with photons ...
user52290
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Could macroscopic primordial black holes have created metals shortly after the big bang?
After seeing articles about the JWST like these two: https://news.cornell.edu/stories/2023/02/astronomers-discover-metal-rich-galaxies-early-universe
https://www.livescience.com/james-webb-space-...
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If the energy density during inflation were lower, how would the CMB look in comparison to the observed CMB today?
I am assuming that a big bang followed by inflation is still theoretically possible with a different starting density. Would the CMB look the same but just colder?
user50918
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Does the other side of the Big Bang factor into JWST observations?
Our (roughly) 13.6 billion light year view to the point of origin (big bang) is just along a radial axis. Assuming most matter ejected in a (roughly) spherical pattern, the diameter of the universe is ...
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Is the Big Bang a theory or a model?
I ask this because someone mentioned ‘it isn't a theory, it's a model’ in the comments in an old question of mine: Is the expansion of the universe proof of the big bang?
I guess defining terms is ...
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Why is it assumed that the universe started out with a size equal to the Planck length?
What if the Planck length is the distance between particles when the universe was very small .
For a spherical ball of 10^ 78 protons that would give the universe a radius of 10^26 X 10^-35 = 10^-9 ...
user50623
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Why do cosmologists assume that inflation began shortly after the Big Bang, rather than at the exact start?
Somehow, I have never come across an explanation of why cosmologists claim that the alleged inflation of the very early universe occurred not at the Big Bang, but very shortly afterwards (~10^-36 to ...
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