Big bang Definition and 916 Threads

I don't get it...even Guth from MIT who is one of the pioneers of the big bang concept says that "we know that something banged, but why it banged and what caused it to bang is another story" - quoted by memory but the meaning was like that. So...some people think they are too smart to realize...

http://www.youtube.com/watch?v=fJ-D5AUGVcI&hl=de" http://www.youtube.com/watch?v=inzgHjEVxAc&feature=channel" http://www.youtube.com/watch?v=WD3BWt85bxA&feature=channel" http://www.youtube.com/watch?v=YXDSCEX5wE8&feature=channel" http://www.youtube.com/watch?v=YX30dxKdJkc&NR=1"...

So my first question is, how do we know how many stars are in our galaxy? And the second is, how do we know the big bang started with a singularity (as opposed to, say, the universe being a few light years wide and then start expanding 13.7 billion years ago until it reached our present size)...

If our sun will took around 15 billion years to convert hydrogen (Atomic#1) in helium (Atomic#2) how much time it took, since big bang, to generate heavy atoms like all we have on Earth as iron, uranium, plutonium and etc ?

At the point of the big bang, when did gravity split off from the other forces? How many seconds in (i.e. 10^-30 seconds or something like that)? I've been curious as to how the forces split; I was hoping for a specific number here, but I never found one. Thanks.

I've been watching videos and reading about black holes and big bang and many questions puzzle me. But here's one that I don't really get it. How the big bang even started since it had all mass of the universe in it. Therefore its gravitational pull in itself would surpass any mass of...

Hi everybody. There is a theory that the big bang was a whole bunch of matter from another reality, transported to this reality by an inter-demintional bridge. I do not agree with this. What does everyone else think?

I've heard Stephen Hawking and many other physicists voice their opinions on the issue of what was or what the conditions were before the big bang. Stephen Hawking says: "As far as we are concerned, events before the big bang can have no consequences and so should not form part of a scientific...

What were the necessary conditions to allow a big bang to occur?

Is there a generally accepted Physics explanation of the apparent "small entropy" of the big bang vs the apparent "large entropy" of theoretical the big crunch?

I heard this joke on the latest episode of the Big Bang Theory today and I thought I can share it with you. Penny tells the four guys this joke to pull their attention away from a new girl that just moved into a flat above them, and here it is: (A physicist goes to an ice cream parlour every...

I noticed the following relationships, and I'm curious if these are why physicists believed all forces might have been equal (or unified) during the big bang. Pm = Plank Mass Pl = Planck Length Pt = Planck Time Pf = Planck frequency (non-angular) = 2.952104e42 Hz Eo = Electric Constant Uo =...

Has charge (magnitude) [edit] lost some of its value since the time of the big bang? If so, what's the theory behind this?

What was the force holding the matter together before the Big Bang? Gravity, electromagnetic forces, or something completely different?

Please clarify and tell me where I am wrong. Before the big bang Time did not exist, nor mass, nor energy, nor velocity. Or did they? Thanks you for your help.

Well actually, I only have one question about the Big Bang model. According to Big bang theory, at the beginning of the universe the was a very high density region. So then the pressure on our early universe must be really really high. When there is pressure present , that means there is outward...

I'm watching a documentary on the L.H.C and it struck me as odd when the narrator mentioned that the L.H.C. would be able to create the types of temperatures and pressures that were present at the big bang beginning. I found it odd that two protons could recreate those conditions.

Could the Big Bang Have Been A Cyclical Event? I am a layperson...this is a long-pondered question. Is it possible that Black Holes serve a greater purpose...to facilitate a massive contraction...which will then lead to another big bang? It's logical that the Big Bang was precipitated...

Hi, I am trying to understand how it is possible to make predictions about the energy density of early universe using the freidman equation if the expansion rate of the universe has not been constant throughout history. As I understand it there are three main variables in the freidman...

Broadly speaking, any new theory, (plate tectonics, origin of species etc.), on an established subject, will be greeted with howls of opposition, but with the course of time and ever more supporting evidence, the theory will gain favour, as it was with the big bang. The principal evidence was...

I posted this question in the general physics section and the physics part has been answered somewhat. However the cosmological components remain un-answered. Would someone be kind enough to comment on those aspects please? Here is the question; Matter and Antimatter, I have always...

Would the average density of visible distant objects in different directions in the night sky give any indication that we are near the center of the "big bang?" If we were out toward the edge, I would think it would be significantly different.

Does anyone know if this ether which light traveled through existed before the Big Bang?

I'm not as well read on big bang theory as some of you, but I have spent a lot of time wondering about some of the comments used to describe it in the media or education. A lot of them describe it as being a single, immeasurably small, finite point and being composed of pure energy. String...

What real proof is there of the Big Bang? I have never heard anything that is convincing. And how do scientists determine the age of the universe, is it really calculated or is it just estimated?

I know it's the popularly accepted theory of how everything began, and for the moment, let's assume it's true. What I'm trying to understand is the red shift in terms of the farther away an object you observe is, the farther back in time you are seeing it. The further away objects are the...

This video is worth watching. http://pirsa.org/08120001/ Quantum Nature of the Big bang in Simple Models. Abhay Ashtekar Perimeter video with slides PDF 3 December 2008 "According to general relativity, space-time ends at singularities and classical physics just stops. In particular, the big...

While I am not a scientist, I am working with the application of cavitation onto biomass as a co-catalyst for its rapid dissolving into sugars, which we expect to see catalyzed directly to biodiesel and biogasoline...beyond the ethanol paradigm and its Donner Trail. We utiilze all of the...

Personally, I don't believe in the big bang. But those who do, can you explain this to me please. We all know that the Earth is exactly the right mass to orbit the sun, and that the inertia of the Earth keeps it from flying into the sun. We also know that the velocity of the Earth is exactly...

From how we expect the Big Bang must have developed, huge amounts of both matter and antimatter quarks and electron/positrons were created. Most of the total matter was destroyed in matter/antimatter annihilations. With our resulting universe containing normal matter due to some asymmetry...

If the universe is uniform no matter in what direction you look , then looking in two opposite directions, two observers, if each looks far enough will see the Universe at its earliest time -- The Big Bang. Therefore, the event of the Big Bang cannot be from a point singularity. It does not...

Sorry if this isn't the right place for this post. Please do help me move this topic if necessary. I'm just a bit curious that the law of entropy states that the disorderness of a closed system will continually increase. However, the big bang theory says that the universe will expand until...

Now correct me if I'm wrong. Gravitational singularity is when It has a defined mass but no volume and the equation for density is d=m/v. If a black hole's mass is say 10^40 yottagrams and its a singularity so it has no volume = 0. How can it have infinite density if the equation is (10^40...

Where did the initial particles or forces that were apart of the big bang come from, because they had to come from somewhere inorder for it to happen. Is there another theory for that? Also I keep reading a lot of stuff about how time was created then. I always thought that time was just...

Hey there Why did the big bang happened? what made it happen? what is the cause of the big bang? Could be vacuum fluctuations? Or a collision between different branes or universes? Could be some sort of a creator? What is the most proved and most appropriate theory that talks about...

What are the acceptable models to eplain how the big bang is expanding the space of our visible universe? Are these the choices? 1) An expanding infinity 2) local expansion with an area of non-expansion beyond our range of observation 3) local expansion with an an area of non expansion in...

Big bang? I'm quite new to Physics as I have just completed my first year towards a Bsc Physical sciences, so I was looking for some more educated views. I watched a programme quite a while ago on plasma cosmology, I had never even heard of this before although I was aware that not all...

Your indulge is greatly appreciated. I am a not a scientist. I am a historian who is fascinated by science. My questions are: How long did the Big Bang last? When did the Big Bang end? Alternate questions are: Did the Big Bang “happen” 14.7 billions years ago? Or did the Big Bang...

I've been kind of in a cave lately, so I don't know if this is really news to any of you folks, but: I just found out about this awesome show that was on this past season. Guess the writers strike must have seriously dampened their viewer-ship. Take a look...

What type of living organisms were there?

I watched an interesting programme a while ago about the atom, and amongst other things relativity was quite prominent in the programme. one of einstein's predictions was that we would be able to detect gravity waves rippling across space time from the big bang, and it cited a current experiment...

Can anyone tell where I can find the mathematical proof of the Big Bang theory and by whom, I'm interest in the calculation only. If you have a scientific paper available with you please send it to me(yousifhot@hotmail.com) I really need it. Thanks a lot,

Wouldn't the Doppler effect stop us from seeing the beginning of the universe unless it starts approaching us? (or unless the universe stops expanding and begins retracting?)

Is it possible at the start of big bang matter and energy went faster than c?

I don't understand the theory as much as I would like to. Please pardon my non technical vocabulary and lack of thorough insight on the topic at hand. So...geez how do I put this into words...So everything imaginable in this universe was compressed, (superimposed?), into what is popularly...

Starting with all the universe mass squeezed into the same little start place (however intuitively improbable) , it went bang and started all those real masses moving apart from each other, at speeds quite high, but not not so high that they could exceed light-speed relative to each other...

Is it dumb of me to think that a black hole just becomes so massive at some point, it basically tears a hole thru the singularity and explodes outwardly like a big bang (through spacetime into another universe or something), or a pin finally pushed thru an extremely tight baloon? just curious...

Can the "big bang" be wrong? The bing bang theory simply states that there was a point at which the time limit of all frames tends to zero ,then it exploded (I think) and the universe was created. then it is supposed that the total summation of forces , energy and matter distributions (just all...

Most of the discussions at this forum are way beyond my level of understanding, but I thought this might be a good place to start. My background is just a college level knowledge of physics, and a hobbyist's interest in astronomy. My question involves the mass of the universe, and a...

Hi We know that a black hole is a dense object so dense that it gravitational makes it vanish from the universe. Now at the moment of the big bang creation event the ultimate in density and gravity was experienced, so what prevented the universe from going the way of black holes. Is it a...