So the big bang exploded into nothingness,energy condensed to matter 13.5 billion years of expansion?
141856
there is nothing and it goes on forever.
72086
Very intersting question which I or no-one else can answer with 100% certainty. I'm no expert in physics but i figure that to create the source of the 'big bang' would  require an infinite amount of matter to be squeezed into a small ball by an even more infinite amount of pressure - which would have to be equal on all sides... so where did all this matter & pressure come from???
743588
When the expansion of the big bang had gone on long enough, the temperature cooled enough to where a free electron and proton could hook up to form an atom.  This is also the time when the universe became transparent to radiation, releasing the signal we see as the cosmic microwave background or CMB.
206102
They believe that matter and energy were created during the Big Bang, however, that raises for a lot more questions, the most obvious one being:\n\nHow can matter and energy be created?
447340
The universe contains all the matter and energy that was ever in it.\n\nSo, going from the Big Bang Hypotheisi, it is reasonable to assume that there was a flash of light (energy, which must remain within the universe) at the time of the explosion.\n\nGiven that light travels at a constant speed, and the universe is about 15 billion years old, the universe is an every expanding sphere of space, 30 billion light-years across.\n\nWhilst it may not go on forever, you'll never reach the outer  boundary!
284884
Under the current Big Bang model the center of the universe is nowhere.  Ok. You don't like that, then how about the center of the universe is everywhere.\n\nThe Big Bang was not an explosion, the term "big bang" came from early opponents of the theory.  Basically it was the creation of space itself.  Subsequently that space has expanded, it is not expanding from somehwhere, it is expanding from everywhere.
955093
There is no scientific evidence about anything that happened before about 1 picosecond after the Big Bang.  At that time, all the particles that are now within our event horizon where concentrated in a sphere about 10^-13 cm in size, and they were very hot.  The evolution since that time has had consequences that can be studied by various methods.\n\n\nNote that the small volume occupied then by our now current event horizon was probably not all of the Universe.  The Universe may have been infinite then, and it may be infinite now.  \n\nWhat happened before that time is a matter of speculation.  We know that physics as we understand it breaks down at that point.  We do not have a complete theory of quantum mechanics and gravity that would allow us to do any real calculations about times prior to one picosecond.\n\nHowever, here is some speculation:  if you have an empty space that is inflating (as space seems to be doing now, because of the Dark Energy), and that space has ground-state energy quantuum fields in it, then every once in a long, long, long while you get something like a Big Bang.  Energetically, it's OK, because the total energy of the Universe may be zero: the positive stuff is cancelled by negative gravitational potential energy.  The event comes about due to fluctuations in the empty quantum fields, and the inflating space pulls the virtual particles apart and makes a Big Bang.  It's unlikely, but if you wait long enough it happens.
1046649
Space is expanding at an accelerating rate, and carrying everything along with it. The energy that causes this is called dark energy. What it is is unknown, but it may be a property of space itself.\n\nIf it was just the leftover momentum from the big bang, it would gradually slow. The fact that the expansion is accelerating means it's something else.
353833
There is conjecture that the universe began with a big bang, out of nothing. If matter formed, then anti-matter also must have formed at the same time to have the various laws of physics as we know them hold good. Some scientist postulate that the big mishap in Siberia in 1906 could have happened  because of the passing of a small quantity of anti-matter. Remember, for anti-matter, we could be as dangerous as is is to us. \n\nI think anti-matter has been created in small quantities in labs, and yes you are right, it could be harnessed to meet with our energy requirements.
828773
The Big Bang occured around 14 billion years ago, the earth didn't come into existence until about 4.6 billion years ago.  The earth did not exist when the Big Bang occurred, therefore the Big Bang could not have destroyed it.  \nThe name "Big Bang" is a misnomer, there wasn't really a "bang", the name comes from a nickname given by supports of the old Steady State Theory, which now has very little to no support.\nThe explosion cooled, allowing the four main forces of the universe (gravitational, the electromagnetic, the strong, and the weak forces) to split apart.  Matter finally arose out of the energy created by the "bang", forming a plasma of quarks, gluons, and leptons.  These finally coalesced into protons and neutrons (via the strong force), finally they formed atoms by uniting with electrons via the electromagnetic force.  \nMatter coalesced via gravity into star and galaxies.  Planets arose from extra material not bound into stars.  \nI think God caused the Big Bang, but he didn't just "bang" it into existence as you put it.  If he did, why did he spend three or four days on one little planet in the entire cosmos, and spend only a single day on the rest of the universe.  I think it is rather illogical.
440137
Repeat after me:\n\n"There is no explosion in the Big Bang theory, only expansion."\n\nThe name "Big Bang" was actually originated by opponents of the theory, and unfortunate name as the theory involves no "bang" at all.
1158164
First of all there was NO material at the instant of the Big Bang, only spacetime and energy. The first low-mass atomic nuclei didn't form until about 3 minutes after the Big Bang event. Prior to that the universe underwent what's commonly called 'inflation,' when it briefly expanded faster than the speed of light. Such a rapid expansion would easily counter any gravitational effects present. No, faster-than-light expansion doesn't violate relativity because it was only space that expanded, not mass.
127551
Because the universe is a vacuum and there's nothing to stop it from expanding. This is assuming that the big bang theory is correct and it's expanding because of the explosion .
899198
After 1 to 3 minutes from the initial explosion of the cosmic egg (Big Bang), when temperature has cooled to about 3 trillion degrees kelvin, it is speculated that composite particles such as protons & neutrons become common state of matters.\nKey phenomena that support Big Bang Theory are:\n1) Universe is expanding, and from measurement of the proportional velocities of stars in relation to their distances from us, there is strong probability that an "Event" (such as Big Bang) occurred simultaneously,\n2) detection in 1964 of microwave radiation from not only one location in the universe (but from all directions at once), lends credence to the theory,\nShape/sizes of galaxies or rather the sizes of the galaxy clusters (to aid in estimating distance of faraway galaxies from us)nmay shed more light into the age of the universe as it is postulated that such galaxies and and milky way were at the same point in time at the time of explosion.
602699
where did the first energy came from, to produce the BIG BANG. Becaseu there is that law, that there is no perpetum mobile, meaning, that everything needs the first impulse of energy. further, energy can be exchanged and such, but not produced from nothing. so how could the big bang happen out of nothing.
638759
The question assumes that the matter was compacted, but before the big bang, there was no universe as we understand it, so the idea of "volume" is somewhat meaningless.  What was the sound that came before silence?\n\nPre-BigBang makes your head hurt doesn't it? It does mine!
441083
The short answer is: we don't know!\n\nWe may never know but this might help you a little.\n\nBefore the big bang there was nothing, absolutley nothing.\nThere wasn't even any space (no dimensions). Even if you had one atom of matter you couldn't put it there because there was no space for it. Do you follow me?\n\nThe big bang not only created all the matter and energy we see in the universe today but also the space/time for it to go in.\n\nRemember we live in 4 dimensions, 3 spacail dimensions and 1 time dimension (time direction)\n\nBefore the big bang there was no space, more importantly there was no time.\n\nSome say that with absolutley no time for something to happen in. Something was bound to happen. The Big Bang\n\nRemember, its just theory that appears to fit the observed evidence.