Bigbang Definition and 24 Threads

This book was recently offered (and sold) in the Buy, Sell, Trade, Giveaway Book Marketplace section of the Forum. That inspired me to pull out my copy (1988 "Updated Edition" from Basic Books). I read this probably 30 years ago. My question is, how much of this story is still considered valid...

I see these people everywhere and I wonder why people don’t believe it. Does anyone know why some people think this way?

How can a single Big Bang be true if matter is disappearing into multiple holes within multiple galaxies throughout the cosmos and no matter how far back into the cosmos scientist look the galaxies are as mature as the galaxy we reside within?What matter will be left exactly to actually...

As a layman in physics, I cannot understand the block universe concept followed by Rietdijk-Putnam-Penrose Argument. Let me clarify my question as follows: Suppose two objects, one stationary and one moving towards the other one at constant relativistic speed, e.g. 05.c and let's also presume...

Hi, I am quite confused about followed question, I think scientist think the last scattering surface was dense plasma at the temperature of 3000K. If the today's universe much cooler and less dense then "the last scattering surface" how can anyone says entropy increased by time? Isn't universe...

I've heard it said multiple times on here and elsewhere that as we "wind back the clock" of our Universe and the Big Bang that our laws of physics kind of begin to fall apart, in a sense. If this is true, can anyone explain exactly which laws become more difficult to work with, and why? Thanks.

I've studied in many books, from which I learned that a vacuum is not truly a vacuum, that is, virtual particles are created every time. And I had also learned that the universe is left handed, that is a small non obeying in parity symmetry(individually), resulted in production of around one in...

Billionaire entrepreneur Elon Musk has launched rockets, spaceships and electric cars, and after his stint on CBS's "The Big Bang Theory" last night, he can add TV sitcom to his epic list of achievements. On Thursday (Nov. 19), Musk became the latest real-life space personality to make a cameo...

Well, the string theory talks about multiverse, unlike the Big Bang theory. Michio Kaku explains it by comparing it with bubbles. There are many universes. These universes are like bubbles floating around, and when they collide, they form a single bubble- a universe. When a single bubble...

Scientists suggest that there was nothing before the Big Bang. Nothing. Seems to me, the fact that the whole universe came from nothing makes no sense. I know that there isn't an answer yet but I would like to hear what others might think about this issue

It is understood that the universe could be understood only from 10 -43 sec after big bang. is there any study or information about the nature/physics of primodial existence before bigbang

What could have been happened in the bigbang.If there were an observer what would s/he see. And were there absolutely Nothing before big bang,Does that make any sense?

how all the infinitesimally small sub atomic particles created after Bigbang came across to annihilate with their anti particles in the vastness of universe ? even in accelerators they rely on probability only a few particles collide , so why do people assume all matter particles annihilated and...

Please teach me this: What does causality principle mean when space time dissapear(e.g being inner black hole or before Big Bang).Does it meaningless to say about causality when having not the time. Thank you very much in advance.

What happened before the bigbang?

That explain cosmic microwave background ? Cosmic microwave background (referring to the hiss that was detected by Wilson and Penzias, using microwave wavelength satellites, and it is found everywhere) and it is evidence of the big bang, but is it evidence of anything else? Are there other...

Bigbang Bigcrunch "Singular" event? Ok so I am just a layman that reads too much and understands too little, but I was hoping someone could help me out with this. I've read a lot about the theories of open, closed, flat universe etc. Some theories say the universe expands to infinite size after...

we are living in this milky way galaxy which got separated from bigbang ,the separation would not have taken place in light speed but how come we are tracking the light that is emitted from bigbang period from our earth

First I don't understand that what is order and disorder, as said that thermal equilibrium is disorder, but for equilibrium there is only one state, but 1st law of themodynamics says that a state with larger no. of microstate is much probable than one with less no. So equilibrium can be only in...

can anyone explain me about the bigbang singularity

i read somewhere that right after the bigbang, microblackholes were formed which later vaporised. is it true? how can they simply have vaporised?

Classical black holes said to have zero temperature...but in BBT,it is same like a black hole where matter is compressed but it said to have high temeprature...both black hole and matter at bigbang is very compressed then why classical black holes have zero temeperature and big bang has high...

Is vacuum a necessity for BigBang? I believe most acknowledged theory for the beginning of Universe states that BigBang happened when nothing existed but vacuum or void. But is there a physical observation or a well-established theory that BigBang can only occur in vacuum where nothing...

Here is the Penn State press release http://www.eurekalert.org/pub_releases/2007-07/ps-whb062907.php called "What happened before the big bang" the press release evidently covers much of what you need a subscription to read in Nature Physics magazine, or else have to get it at your university...