All Questions
Tagged with big-bang space-expansion
321
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How was the Big Bang possible if it was so dense even light cannot escape? [duplicate]
Since the big bang comprises of all the particles in the universe in an extremely dense point, couldn't it to be said it would be the most massive black hole to ever exist? Since even light cannot ...
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Big Bang and relativity [duplicate]
Wasn't the big bang's explosion itself faster than speed of light? how does this not violate relativity, I had read an explanation earlier but it wasn't sufficient, can someone explain to me how the ...
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Where did the CMB come from? What is due to the matter/antimatter annihilation? Or perhaps the radiation released when the electrons decoupled?
Where did the CMB originate from? I get that at the beginning of the universe, by the Big Bang theory temperatures and pressures were too high for matter to exist, and even if it did, it would just ...
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Did the universe need the presence of matter and radiation to start expanding?
I have read this question:
Hence it is not possible that photons generated by stars is contributing to dark energy.
Could photons generated from the many trillions of stars be some how contributing ...
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Is cosmic background radiation consistent with the Cosmological Principle? [duplicate]
Is the observation of cosmic background radiation really consistent with the cosmological principle? It implies that there is a "special" rest frame of motion with respect to the big bang. ...
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A fire at the end of inflation?
In their article at bigthink.com "Surprise: the Big Bang isn't the beginning of the universe anymore", the writer articulated an alternative theory that suggests inflation didn't begin at a ...
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Black Holes, Gravity, and the Creation [duplicate]
As I suppose we all accept, the universe started as an unintuitive singularity—either, "Let there be light," or "The Big Bang". Something from nothing expanded and at luminal ...
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What are the biggest shortcomings of the Big Bang theory?
Big bang theory is the most accepted theory by the physicists. It explains about the origin of the universe but what are the loopholes of this theory? Is the loophole about time or space or the origin?...
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How long ago was the Universe small enough for interstellar travel?
Currently, even the nearest stars are lightyears away, and impossible to reach in our lifetimes. If space is always expanding, and was once infinitely smaller, then at what point in the past was space ...
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Does the model of how a ball falling through Flatland would appear to a Flatlander have any implications for theories about the Big Bang?
It struck me that the Flatland example has some similarities (for me as a non-physicist) to the way the Big Bang is described. i.e not an explosion, but an expansion that is accelerating. My limited ...
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Is space really expanding?
In a book called "Einstein, Relativity and Absolute Simultaneity" there was this sentence by Smith:
There is no observational evidence for a space expansion hypothesis. What is observed are ...
user311398
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Why does CMB radiation propagate towards us?
There is something with CMB radiation that does not sit well with me... It seems very counterintuitive that we are able to see it. If CMB radiation formed at the early phases of the universe, would it ...
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Can we observe an event that occurs more than 13.7 billion light years away? [duplicate]
In Kurzgesagt's latest video about the largest black holes, the narrator says that two black holes have been observed orbiting each other at a distance of 17 billion light years from Earth. So light ...
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What was the volume of the universe a short time after the big bang? [duplicate]
I assume this question is somehow ill posed, but I do not know in which way.
I think it is not a difference here whether the universe expanded into space,
or space expanded itself.
Seen from the ...
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So Universe Expansion is accelerating, it already did with the Big Bang, so what came in-between?
So scientists are finding that the Universe is expanding at an accelerating rate.
It is said 'Dark Energy' is the cause. Ok.
But the Universe expanded at a reaally accelerated rate just after the Big ...
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