Questions tagged [big-bang]
According to the current cosmological theories, it's the model that explains the early life of the universe, starting from a rapid expansion of hot and dense matter.
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How can a quasar be 29 billion light-years away from Earth if Big Bang happened only 13.8 billion years ago? [duplicate]
I was reading through the Wikipedia article on Quasars and came across the fact that the most distant Quasar is 29 Billion Light years. This is what the article exactly says
The highest redshift ...
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What could explain the measurements that the Methuselah star is older than the universe?
So there has been talk in the news of a star named Methuselah that is "older than the universe". Moreover, this star happens to belong to our very own Milky Way.
The article mentions that Methuselah ...
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Was there a first moment in time?
Disclaimer. I am a mathematician, not a physicist. The extent of my physics training is a couple of high school courses. So, you may have to be very patient with me in understanding your answer(s)/...
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Electric charge neutrality of the Universe: evidences and theories
I've always wondered why the number of protons in the Universe exactly matches the number of electrons. They are such different particles with totally different cross sections. So, first of all, is ...
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Do primordial background neutrinos orbit in dark matter halos?
According to Wikipedia, neutrinos separated from other matter seconds after the Big Bang and formed a separate background radiation field which now fills space at a temperature ~2 K.
Supposing ...
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Why can’t you see at the start of the Big Bang?
I’m quite confused with regards to photon emission throughout the creation of the universe.
From what I’ve heard, there was no light (of any frequency) in the universe until 300,000 years after the ...
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Are scientists missing the point with distant cosmic objects, or is it just me?
I was reading this article this morning:
http://www.bbc.co.uk/news/science-environment-13539914
Scientists have discovered a gamma-ray burst whose light has taken 13.14 billion years to reach Earth. ...
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Is there a Cosmic Gravitational Background Radiation (CGBR)?
The recent discovery by the LIGO made me wonder about this.
We know that there exists a CMBR, Cosmic Microwave Background Radiation, a blanket of electromagnetic energy covering the universe, made by ...
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What is our location relative to the Big Bang?
Given what we know about space, time and the movement of galaxies, have we or can we determine what our position is in relation to the projected location of the Big Bang? I've read some introductory ...
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Regarding matter-antimatter asymmetry
We all know that the asymmetry between matter and antimatter is a big puzzle in physics. But I don't know why one expects matter-antimatter symmetry in the first place? As in, is there a fundamental ...
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How can something happen when time does not exist?
I saw this documentary hosted by Stephen Hawkins.
And if I didn't get it wrong, it says that there was no time before the big bang, time was created there.
So how can anything happen when there is ...
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What has been proved about the big bang, and what has not?
Ok so the universe is in constant expansion, that has been proven, right? And that means that it was smaller in the past.. But what's the smallest size we can be sure the universe has ever had?
I ...
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Does the fact that energy is not conserved in cosmology open the possibility of new matter/atoms being created in the universe?
Does it open the possibility of new baryonic matter/atoms being created in the universe and avoiding the Heat Death of the universe?
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How would cold neutrinos get trapped by stars?
Continuing on from the cool physics Q&A'd on the threads Where are all the slow neutrinos?, Is it possible that all "spontaneous nuclear decay" is actually "slow neutrino" ...
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Where does matter come from?
I admit, it's been a few years since I've studied physics, but the following question came to me when I was listening to a talk by Lawrence Krauss.
Is there any knowledge of from where matter that ...
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