Big bang Definition and 916 Threads

Forgive me if this question is very basic but I have trouble finding a clear answer on it. In the big bang theory did space and time exist before? or was it created during? thanks

alright so my friend was telling me about the big bang. anyways he was saying that it all came out of some black hole or w/e and i don't really believe him. my parents say that its not possible that the universe was made a million years ago so i don't know wat to believe. i mean i took phycical...

I'm a complete layman, and very curious, but don't have a lot of in-depth knowledge to tackle the following: Recently, someone presented an argument to me against the Big Bang. His argument was that taking into account the matter of the universe and the nature of gravity, the universe should...

If there was no time before the big bang then how did it happen and how could time be created if there was was nothing to make it?

"The whole universe was in a hot, dense state, when nearly 14 billion years ago expansion started .." The big bang (BB) is often recapitulated by noting the times when the universe was the size of a proton, or the size of a grapefruit, or the size of our solar system. This is most easily...

Why do we think that the Big Bang contained "all" the matter/energy in the universe? If we imagine the point, the "big bang point" to be some accumulation of mass, what makes us think that it should have "waited" for all the mass in the universe to accumulate in it before exploding? That's...

If it was an infitesimally small point, then the composition of said infitesimal point would be dimensionless, and by definition without part. How could something without part erupt? I understand that an infitesimal point could form a substance if there is an infinite amount (in fact, any...

Simple question. Am I right in thinking that, according to current theory, the rapid cooling occurring after the Big Bang is a direct result of the universal spatial expansion (absurd as it may seem), for the following two reasons. 1) as the (hot) particles of matter move into that new...

I'm wondering, now that the universe has expanded and is now pretty much flat, can any experiment we do tell us what might have happened during the Big Bang, when the universe was still small and tightly curved? It doesn't sound like the same situation. The results we get today travel meters or...

The Big Bang Theory: The Big Bang Theory is one of many theory's on how the universe was created. From what i have learned of it, the universe was thought to have been created by to atoms (or particles) colliding together and causing a massive explosion which created the universe we know today...

As I understand it, the big bang is based on the fact that all the galaxies are drifting apart in the universe. If we reverse this we end up with the big bang. But is this not based on the assumption that the universe has always been expanding? How do we know that 4 billion years ago the...

To compress the observable universe into the size of a grapefruit, it had to be devoid of all motion, and therefore all heat and energy. Why wasn’t the heavy hunk of matter the size of a grapefruit that preceded the “Big Bang” that created our observable universe cold and without energy...

This may seem a silly question to some. but I am asking it for a reason which I will expand upon after someone explains to me the how. How do we look back in time to the big bang? CC

Dear members, i am new to this website and i feel that i am really out of my depth with the many clever people who are on here and i am no scientist!. i am just somone who is interested in science and technology. i have a question which i haven't been able to find the answer anywhere and if...

According to Einstein, the Big Bang theory did not make sense because he said if you mapped the paths of the galaxies and stars back in time they would not collide at a singularity at the center of the universe, they would miss each other. Since many people accept the Big Bang theory, has it...

http://img76.imageshack.us/img76/2711/virgocluster.jpg Look at this image of the Virgo cluster of galaxies, for images of galaxies extending as far as the eye can see, some appear to exist in a swarm around the sub cluster at the core, others are in streamers and wisps of galaxies extending...

Hello, The Big Bang supposedly set matter and energy (the four known forces) in ‘motion’ causing ‘events’. A simple example: elements of the electroweak force holds an egg on the surface of a table while the mass of the Earth warps space and accelerates the egg while pulling it towards the...

I have read "The First Three Minutes" and all of the information about the Big Bang on Wikipedia, but I cannot find through either of these sources the newest theory of the first particles to arise after the Big Bang. Is it possible that one particle may have been first? Also, I am interested in...

I've been trying to understand the big bang theory recently and would appreciate some expert opinions. I was talking to a physicist who is convinced that there was no big bang and that in fact we are living in a 'big bounce' Universe because apparently that is the implications from string...

I am rather confused what comprised of the thing that existed before big bang which later turned into matter after the big bang. Moreover, i read somewhere that matter are created spontaneously in the Higg's field. And this Higg's field was created after a fraction of seconds later the big bang...

We can apply Heisenberg's uncertainty principle (between energy and time) to the Big Bang. In early universe, at moment t, no energies below h/t were possible in principle because there was not enough time for such low energies to manifest. That minimal energy defines a minimal temparature...

In the most recent theory I have heard, just in the first moments after the Big Bang strange things happened. I heard that there was not four fundamental forces, just one, or superforce. I also heard that the laws of physics did not apply. How long was this time. As from research I have...

So now, do big most bang beleivers and non beleivers think the COBE satelite really proves one way or another the validity of the big bang theory as opposed to the theory that the universe has always existed and that time is a man made concept? Essentially, Is the argument swayed one way or...

i must write paper on big bang theory but i don't really know what should be included. i am from korea and the words are so confusing. maybe if i had a brief outline i understand more better. thanks physicists

"Big Bang" is a misnomer. And as a consequence of this misnomer, most non-cosmologists continue to picture it as a big explosion. Though they forget that explosions are destructive rather than creative. The Big Bang being an explosion just wouldn't make any sense. It wasn't an explosion.

If the universe is shown to have angular velocity, is this evidence of a physical universe prior to the "Big Bang"? Several studies are being undertaken currently to determine the rotational velocity of the universe. So far they have all indicated a positive velocity although the values...

Was there only 1 big bang? Why not 2 or 3 or billion ? Please don't flame me - I'm not physicist, I'm just curious :) Thanks very much for attention.

I know the topic is incredibly original, but I was just curious as to how many people genuinely accept this as a feasible explanation for the creation of the universe. Personally.. I think (at least for a long time) that there is no way of knowing. I don't like how mainstream this theory has...

Hi, Just a quick question. Does anyone know the original reason for discarding the idea of the big bang as an explosion?

As everyone here is into physics in some shape or form, I am sure everyone has at least heard of The Big Bang Theory by now. So, what is everyone's thoughts on the show? Do you like it, love it, got to have it? Who is everyone's favorite character, or favorite episode? Let's talk about the...

I have a question regarding the conditions "prior" to the Big Bang. I realize tere is no empirical evidence for these conditions, only speculations. At the point of the Big Bang, all of matter and energy was "infinitely" densely concentrated at a single point, correct? Even though GR breaks...

I'm sure there is an obvious answer for this, but i don't know it. The big bang, where is the center thought to be? what direction with respct to the constellations?

If all mass of the universe was in a region 1mm in extent then was it a black hole (escape velocity greater than c)? Now 13 billion years later the universe is bigger. What is the escape velocity now? Did it change from >c to <c?

Excellent presentation: An introduction, or possible review, of the BIG BANG theory by an originator of inflation theory, Alan Guth of MIT: Note the video is in TWO PARTS...scroll down a bit for part II. 13 October 2009, Institute of Physics Inflationary Cosmology: Is Our Universe...

I've heard claims that the Big Bang defies the law of conservation of angular momentum. For example, not all planets spin in the same direction in our solar system. I think venus is an example. How does this defy CAM?

I have a few questions and I was hoping you guys could help One, would it be theoretically possible for the creation of a black hole in one universe to generate a big bang/white hole creation of another universe, kind of shifting matter and energy from one universe to create another. Two...

Now, assuming the big bang theory is true, how can we explain how that first tiny particle got there? If that small particle of energy did form from nothing, what are some of the scientific laws that this would go against?

Hi We know that our universe is closed and that outside of our universeis no space, neither empty space. So, space is only where matter is. There are also other arguments that space is always connected with matter. What are the main arguments that space does not exist outside our universe as...

I have been thinking about how the universe came to be and this idea came to me: Suppose space is comprised of parallel super dimensions (branes) and one contains a universe that is collapsing. As the universe nears a singularity; space will warp into an outward cone. If this cone touches an...

I often hear creationists claim that the Big Bang Theory states that something came out of nothing and exploded. Interestingly enough, I've found that physicists are often quote mined as saying things like "the universe came from nothing." Why would a physicists say such a thing? "Big...

Cosmologist say that the universe is expanding but from no central point. It seems contradiction to me because the universe also started from a single point and EXPANDED outward. Further, they say if you reverse expansion everything would compress back to a singularity. Seems like expansion is...

Is this a true statement regarding the Big Bang? "The BB is not that matter and energy ’exploded’ It is that matter and energy came into existence, along with time and space." I'm in the middle of a discussion, and someone said that, and it struck me as wrong, but I thought "what the ****...

So I am defiantly no scientist and I don's know much so if I jump around with my knowledge I am sorry. If I am wrong, correct me for that is why I am here. It has been said that the black holes take in everything and anything which comes to a miniature 'ball' for say. If what I know about...

My knowledge in physics is very limited. Could someone please explain what this means in regular English? :rolleyes: Thanks! Published on http://bit.ly/vtJBW": Here are the http://arxiv.org/abs/0908.2407" (PDF).

In another thread (Cosmic Darwinism) I mentioned a scholarly book (600 pages) with a chapter on the cosmological natural selection hypothesis. This idea seems to be getting more notice. I just ran across another book---this time a popular-written one called Before the Big Bang which talks about...

I was watching "The Universe" on History Channel today and it was asking the quesiton, "what was before the Big Bang and what triggered it?" Unforunately, I had to leave and could not finish watching it. Could someone shed some light? Even if you didn't see it, could you please fill me in?

I'm not exactly highly experienced, considering I'm only 17, but i was just curious what anybodies thoughts are regarding a little idea i had while reading a science fiction novel called A Signal Shattered My thought was that if before the Big Bang, the Universe was infinitely small and...

I know nothing about astronomy, (but I find it very interesting) so, here it goes: 1-If you look at the sky, is there an exact location of the Big Bang? If so, where should one look at? Or is the BB more like space being created between the planets? -If the first one, Shouldn't that place of...

According to widespread modern knowledge, the universe possesses about 0.4 of the required mass to collapse back into it's original state, in a sort of 'big crush', As the current predictable future of the universe is to expand in an exhilarating speed while 'tearing up' the matter into the most...

Is it generally true that the further away a galaxy is (and more red-shifted), the more it tends to contain lower metal content stars? I'd always assumed this was one of the main bits of evidence for the Big Bang, but I've also read that the globular clusters that surround (and are...