Questions tagged [big-bang-theory]
Questions regarding the currently prevalent cosmological model for the origin of the universe.
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How does science knows what is the early universe?
I've read about Hubble seeing the brightest quasar in the early universe. Question is, how does science knows what is early and what is late?
Please correct me if I'm wondering, but after the big ...
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1answer
104 views
Why more matter still left after collision with anti-matter?
Question implies all, why is that? Why we exist even after equally creation of matter and anti-matter, any possible exception?
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0answers
38 views
Is there a theory about a collision between a shrinking universe and a new expanding universe?
I recently read a post on a discussion board about the creation of our current universe that stated, and I quote:
[T]he shrinkage activity of the old universe and the new Big Bang expansion ...
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1answer
94 views
How could time only have started with the Big Bang?
I understand that before the Big Bang time (as well as dimensions) didn't exist. But how could this be? If there was no time then nothing could change, and so time itself couldn't come into existence.
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1answer
101 views
Is it possible that the Universe is expanding due to additional Big Bang events?
Is it theoretically possible that the Universe is expanding due to additional Big Bang events that have occurred at the same location that the original Big Bang occurred at?
Perhaps there has been an ...
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1answer
68 views
How thick is the cosmic microwave background, including the part we cannot see within the observable universe?
What I want to know is how thick the observable universe is from the point of the cosmic microwave background and beyond.
It appears the thickness of the cosmic microwave background itself (the part ...
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3answers
84 views
If the Higgs field only formed after the Big Bang, how was hydrogen formed?
These two statements seem to conflict, but since we're here they can't:
Electrically charged particles cannot be massless.
Hydrogen was created at the moment of the Big Bang.
However, the Higgs ...
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3answers
200 views
How did space start?
How did this 'black fabric' that we call space start? How was it made? How was the initial singularity formed? How did the first atom come into existence?
If it all started from a tiny particle that ...
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0answers
29 views
Moving galaxies that exceed the speed of light [duplicate]
I read in a article that there are galaxies moving faster then the speed of light. My understanding of this that is not the galaxy that is moving away from us at the speed of light or faster, but the ...
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1answer
279 views
What created the big bang's singularity?
I have heard theories for the big bang like: of another universe existing before the Big Bang, or an unstable white hole that blew up, or our universe detaching from our mother universe, or our ...
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1answer
64 views
Fundamental axioms in LCDM
What are the axioms (if any) behind the LCDM model of cosmology?
NB: axioms, not postulates (e.g., inflation)
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1answer
89 views
Just after the Big Bang, was the space, in its entirety, filled with Hot gas?
After the Big bang occurred, was the space filled with hot gas totally?
If there's any problem in my question please inform me. Thanks!
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1answer
35 views
calculation of characteristic expansion time of the universe
Hubble's constant is estimated at 15km/s at a distance of million light years, without considering effects of mutual gravity, relativity, etc.
I am trying to calculate the characteristic expansion ...
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1answer
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Location of Big Bang [duplicate]
Can I point to somewhere in the sky where the Big Bang happened? A pathway so to speak on where we (and our progenitor elements) came from?
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1answer
63 views
Singularity at the time of origins
According to the big Bang Theory, the universe have started from a point and it describes how the universe expanded from a very high-density and high-temperature state.The initial singularity was a ...
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1answer
101 views
Why Helium could be produced in first minutes of big bang but not heavier elements
At what extent could be sure that no heavier elements than helium could be produced, if we know that matter in universe today is about 25% composed on helium, why could be so sure that the kind of ...
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2answers
163 views
BIg Bang Happened everywhere
According to the Friedmann equations big bang happened everywhere, but if we account for inflation theory, big bang did not happened everywhere. How ? Anyone please explain. Please see the video for ...
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1answer
64 views
Is it fruitful to search for a correlation between rates of in-falling matter in black holes and the expansion rate of our universe? [duplicate]
To my understanding, white holes are hypothetical objects that are time-reversed black holes; black holes gravitationally "suck in" matter whereas white holes "spit" matter back out. As such, I think ...
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1answer
329 views
How could the universe be a few light years across just 1 second after the big bang?
I was skimming through Neil deGrasse Tyson's book Astrophysics for People in a Hurry when I noticed he says something curious on page 26:
"By now, one second of time has passed [since the big bang]. ...
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1answer
317 views
Was the whole Universe close to Big Bang very small, or just very dense?
I am sorry this question is probably silly for professional astronomers, of which I am not one.
I often hear at lectures that immediately after the Big Bang, the universe was small, say, the size of ...
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0answers
41 views
How the observed deuterium abundance constrains big bang nucleosynthesis?
I know deuterium can be used as a good tracer to constrain the big bang nucleosynthesis. But can anyone tell me the in details how this is actually done?
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1answer
102 views
How does inflation justify the nonexistence of magnetic monopoles?
It is said that inflation justifies that magnetic monopoles don't exist. Can anyone explain how inflation theory explains the non existence of magnetic monopoles?
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1answer
377 views
What is beyond the observable universe? [closed]
What is beyond the edge of the observable universe? Scientists say that the Big Bang is the cause of all creation in the known universe, but it would seem the bang must have happened in the center of ...
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3answers
432 views
How can the universe be expanding faster than speed of light? [duplicate]
So the story goes like this:
A long time ago, 13.799±0.021 billion years to be exact, something happened. It was a big bang, loud explosion and universe came to existence. It grew and grew, and now ...
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1answer
191 views
Why do we we even exist? [closed]
It came to my mind one day that why does this universe even exist and why do we even exist and like we are enclosed in the so called atmosphere and a floating rock in space called the Earth, so is ...
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2answers
129 views
Is there a way to know how the magnetic field was at the very beginning of our universe?
I recently read that
Gamma-ray bursts are catastrophic events, related to the explosion of massive stars 50 times the size of our sun. If you ranked all the explosions in the universe based on ...
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1answer
128 views
Was Milky Way formed after Sagittarius A Explosion?
Is it possible that most galaxies (and our galaxy) were formed from leftovers of supernova explosions?
In order to have a black hole 4,000,000 x solar mass the initial mass of the star should have ...
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0answers
211 views
Can quantum fluctuations cause another big bang?
If natural quantum fluctuations caused the big bang,is it possible for the event to occur again? why there weren't any more big bangs caused by quantum fluctuations?
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1answer
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Why did the big bang produce a low entropy universe?
In order for the universe to be as it is, containing stars and galaxies, it is a requirement that the early universe was at a relatively low entropy state.
Why did the big bang produce this low ...
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1answer
258 views
Does a White hole lies behind a Black hole?
While reading about a White holes, I stumbled upon a question "Where does the matter emitted by a White hole come from?" There seems to be 2 possible candidates:
It was the matter engulfed by a ...
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2answers
128 views
How does the earth not continue accelerating? [closed]
I'm not scientist at all so the answer might be obvious but I was pondering about the big bang. I started wondering how is it possible that the earth had to accelerate at some point in history to the ...
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1answer
100 views
From where so much of energy would have arrived as was required for such a giant universe to have come into existence? [closed]
If we convert the mass of all the stars and all the planets which must be weighing trillions and trillions of tonnes by the equation E = m.c^2 it gets converted into an unimaginable amount of energy. ...
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2answers
242 views
Could the big bang have created super massive black holes?
I understand that space was compressed to a single point and that during the big bang all points within that expanded away from each other at phenomenal speeds. I also have heard that during this the ...
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1answer
1k views
Amount of energy of the Big Bang
What is the currently accepted estimated range of the amount of energy of the Big Bang event?
In joules at some estimated size, so a temperature may be calculated.
For context, I wonder if the ...
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2answers
132 views
Collision of Galaxies
According to the big bang theory, the universe started from a small intial point and is essentially expanding. However, my question is that if the universe is expanding how is it possible for galactic ...
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2answers
248 views
Which constellation would appear to revolve around Denab,Vega or Thuban when axis of the earth would point toward them?
We have been calling the star by looking at which we can make out the direction of the North Pole the North Star. This was the only method at the disposal of the sailors during the days when they did ...
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1answer
254 views
What existed before the big bang [closed]
What existed before the big bang?
What all thing are there inside big bang object ?.
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3answers
158 views
What made cooler temperatures suitable for atom formation?
I have read in relation to Big Bang theory that after 300,000 years of big Bang temperature was reduced to 4500 Kelvin and this gave rise to Atomic matter.So,my question is why reduction in ...
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2answers
143 views
How Good Are the Upper Limits on Heavy Elements?
There are between 90 and 254 stable nuclei all the way up to element number 82. In discussions and graphs about big bang nucleosynthesis nothing above lithium is even mentioned. It's a pretty safe bet ...
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1answer
407 views
Did uncertainty principle triggered big bang? [closed]
So i want to know why world changed from the empty state ( no materials, energy and ...) from to the it's staring state in the big bang shape?
based of this answer's to this question:
big-bang-thoery-...
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1answer
93 views
(Thought experiment) if we put a huge mirror into space, could we see back in time to the big bang? [duplicate]
This is an addition to this question which is closed:
By putting a mirror in space, would we be able to see into the past?
Imagine there is a supernova a hundred years ago. Lots of people see it but ...
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1answer
273 views
Redshift quantization
A full disclosure to begin with: I'm a PhD student in mathematics and while I understand most of standard cosmological-astronomical terms and I've followed a one semester course on cosmology, I don't ...
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1answer
4k views
Why didn't the Big Bang produce heavier elements?
Shortly after the Big Bang, temperatures cooled from the Planck temperature. Once temperatures lowered to 116 gigakelvins, nucleosynthesis took place and helium, lithium and trace amounts of other ...
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1answer
109 views
How could visible light be in pitch-black? Can it be? [closed]
How could visible light be in pitch-black? Can it be?
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1answer
64 views
On gravitational wave radiation and arrangement of galaxies post- big bang
Orbits of planets and stars decay due to gravitational wave radiation. An elliptical orbit would become more circular with time. This is especially observed well in binary systems.
Taking the example ...
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1answer
188 views
Cosmic microwave background radiation: why did it take so long to get here?
I understand that the universe after the big bang was a super dense cloud of elementary particles, and because of this high density was "not transparent" to light.
Then, roughly 400.000 years (380....
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1answer
113 views
What could be past the particle horizon?
Forgive any kind of "dumb" question I may ask as this is a new interest of mine and I know it's purely hypothetical.
If one were able to surpass light speed and the expansion of space to go beyond ...
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1answer
125 views
How can we use hypervelocity stars to determine the origins of the Universe?
I was reading this article finding evidence of Universe's origin, which describes that in 1 trillion years we may lose the ability to determine how the universe was created.
The answer seems to be ...
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1answer
100 views
Standard Big Bang model and space curvature
Why it is said that in standard Big Bang model space curvature grows with time when the Universe expands? My intuition is that it should be the opposite.
I saw this in a book talking about the ...
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1answer
305 views
Future redshifting and effect on the 'pitch' of CMB radiation
After discovering this question exploring the sound of a blackbody, I started wondering about the sound of the Cosmic Microwave Background radiation from the Big Bang, specifically what the current ...
