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You have probably heard the term "Big Bang" before when people start to talk about the origins of the universe, but when people tell you that the universe started really small (tinier than a grain of sand) and incredibly dense, and then suddenly expanded to what it is today, things become a little more difficult to grasp. The theory of a Hot Big Bang is the most widely accepted hypothesis for the origin of the universe, but it still leaves many questions unanswered. How and why did the universe expand? What caused the galaxies to form? But, perhaps the most daunting question is: "What existed before the Big Bang?" These are questions that are very difficult to answer. Astronomers are like archeologists who study the fossils of the universe. They form their theories based on what they observe, and luckily Big Bang theory seems to fit rather nicely to these observations. So what happened during the Big Bang?

I am not an expert in the sciences, just knowing what I have to know, and my knowledge is so little.. but I have always wondered what will happen when the Universe stops expanding. Will it be like an elastic band and bounce back again?

Hmm, I really like Professor Stephen Hawking's theory, in his books, "A brief history of time" and, "The Universe in a Nutshell" One of his lectures entitled, "Life in the Universe" gives his views on the big bang. This is at
http://www.hawking.org.uk/pdf/life.pdf

ok I addmit it the big baNG was me falling off my chair, sorry

good theariory

LOL Morey...I DO like your Big Bang theory better than Stephen Hawking's one!!

*winks* I aim to please... call me the entertainment

I think at the beginning there was "nothing" and this had exploded. Somebody calls it Big bang :))

Good question.
I am nor really interested in knowing what the begining was and what the ending will be.
All I know is that we are here now, and I think we need concentrate on finding answers on the more important problems in this world.

Moreish that is why I left it Big Bang and omitted the theory part. I knew I would get ya in here...hehehe

So how did it all start? A very good question, and one that is highly debated. Most people agree that the universe started very small and very dense and underwent an initial inflation that lasted a infinitesimal fraction of a second (thus the universe expanded much faster than the speed of light (and you thought nothing could move faster than the speed of light...). But the universe was still really hot, so hot that ordinary atoms couldn't even exist. Electrons caused very small packets of light called photons to scatter continuously, and if you can believe it, light was actually linked, or coupled, to the particles, causing the whole universe to glow. This is the stage that scientists like to call the primordial soup because the universe looked like a plasma "soup" of protons, electrons, neutrons, neutrinos, photons, etc.

Anyhow, as you all probably know, things start to cool off as they expand so as the universe continued to expand, it cooled off. Eventually, after about 300,000 years, it cooled off enough so that atoms could form. Photons are far more likely to scatter off ionized particles like protons and electrons (particles that have an electric charge) than neutrally-charged atoms, so finally the photons traveling through space could move in straight paths instead of constantly being scattered by electrons. As a result, the formation of atoms lead to the creation of the elements hydrogen and helium, and the now free-streaming photons made up a nearly uniform light radiation that filled the whole universe. The study of this radiation, which we call the Cosmic Microwave Background, may hold the key to some of the most pressing questions about the universe and its ultimate fate.

i'm a mathematician not a physician, but 4 all i know,not all scientists believe in that BIGBANG theory...
and those who believe in it, do all agree with 1 thing (and not much more i think):
if bigbang did occure, on very low times after it, all the physics law we know can't apply...
so, i'm am wondering, knowing that scientifics result r the one coming with experimentation or proof, and knowing that nothing we know can apply on those instants... aren't all those bigbang question more philosophy than science?

and 4 those who wanna learn more about it, if u go backwards far again, universe will b as small as u want.
so at a certain time, the universe was smaller than 10^-43m(not sure about that value, but it must b someting like that), which is the smallest distance physicians think can separate 2 atoms.
they called this instant the planck wall, and all that comes b4 can't be figured out by anyone.
i've heard about silly theories about time taking complex valuesand other stupid things...
my point of view, and in this case it's just a question of faith or believing, is that a higher being could have generate it(call it god or whatever).

and 4 u, pammy, expension speed of the universe seems to be increasing, so it's never gonnastop and the universe won't go small again...

"In the beginning the Universe was created. This has made a lot of people very angry and been widely regarded as a bad move...

There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable.

There is another theory which states that this has already happened."
-- The Hitchhiker's Guide to the Galaxy, by Douglas Adams

While the concept of the Big Bang is not patently accepted by everyone, not even all scientists, it isn't because of a lack of evidence. The trouble is with how to interpret the evidence, because it does fly in the face of the known laws of physics, even quantum physics.

Well, that is to say, regarding quantum physics, borrowing more logic from Douglas Adams, if you could figure out just how probable/improbable it would be for a speck of matter to appear from nothingness and then explode into the Universe as we know it, then it could happen.

But regarding other laws of physics, you have to understand that these laws as we observe them today came into being after said firey beginnings of the Big Bang.

Fact is, we know one thing. The Universe is expanding. That is to say, we can scientifically observe the radiation and shifting of light from stars, planets, galaxies, etc. and we can see that everything is moving away from everything else.

Following our traditional laws of physics, a body at rest stays at rest, until acted upon to move. And a body in motion stays in motion, until acted upon to stop. Some force had to have acted to compel all of the matter we have the ability to see to move in this manner.

But we also know that every action has an equal and opposite reaction. We also know about invisible forces such as gravity that attracts matter together.

So, there are two possibilities. Either the matter in the universe will continue to expand further out (forever, if you perceive the universe is infinite)..

Or, the matter will reach some point where it will be compelled by gravity, cooling, or some other forces to contract and implode. This theory is called the Big Crunch, or Gnab Gib.

If you cannot imagine what energy/force compelled matter to form and expand out, it may not take much imagination to think what matter crushing into itself would be like.

While we are in no danger of this happening anytime soon, so perhaps you might see no value in studying it, it is still interesting to ponder. Moreover, imagine the universe does this over and over again.

Perfect cycles of creation and destruction in harmony.

"But what about the End of the Universe? We'll miss the big moment." "I've seen it. It's rubbish," said Zaphod, "nothing but a gnab gib." "A what?" "Opposite of a big bang. Come on, let's get zappy."
-- The Restaurant At The End Of The Universe, by Douglas Adams

Not only is the glass half empty, but its cracked and laced with cianide. - Peter Steele.

I thought it appropriate to slap up after that, Boss-man....

>:)

Heh.. And what Cancer summed up with there, is what the smart-ass scientists refer to as the Big Rip. Seriously, where is the imagination? 13,7 billion years ago it started expanding, Accelerating, and it will tear it self apart in 37 billion years because a force called Dark Energy is causing the universe to accelerate. The universe is theorized to be made up of 1% Visible Matter, 19% Dark Matter and 70% Dark Energy. Another theory is that The universe won't rip, but freeze over because the suns have spread too much.

Darkadmin... anything to get my attention and get me into your room >:)

Cancer, once again, in words what is in my head, that I can not say. Perfectly put.

C_tyler :*

i beleave the universe has always beeh hear, and that our planits and sun were just all drifting along, and acording to there size and density and closeness they just got pulled into the suns gravity,since it is bigger, and since teh sun is moveing, that means it is a part of a bigger "sun" so, when life sprung up, it just grew on the most favorable place. yes, there is other life. for the simple fact that out of all the stars and such in the universe ther is another star like our sun, and with that, life will grow in the most favoriable place. the universe is expanding every day. FACT: the moon moves an average of an inch away from the moon a week. and if the moon is moving, then everything else is moving. so i guess im getting at is that the universe is the raw begenning of everything. with everything moveing and such. life will die and be reborn in a diff place. there has to be a begenning for there to be a end. and the universe is teh begenning for all begennings and endings. im sure all other fomrs of life ponders the very same things as we do. maybe not to the same extent as us, but still ponders all the same.

the big bang is what happens after you eat taco bell er wait nm.
this is what happens when you try to answer smarty pants questions late at night.

hmmmm I have only one comment and it is in regards to elders post.....
42

4 twilightzero,
in astrophysics any object attracts any other...
4 example a planet in andromeda constellation is attracted by earth, but this force is negligible near the attract forces of the stars of that constellation...
the sun is also attracted by earth, but as it's much more heavier(sun=98%mass of solar system)he will almost not move...
and to finish, the fact the moon is going away from earth has'nt anything to do with universe expension(2ships in the ocean can go nearer or further awayeach other, won't tell anything about the ocean going bigger or smaller)...

life wasn't created only on earth, bacteries fossiles has been founded on mars...

for ob1

we are in the milkey way part of the galexy right? and isnt that part of something a lot bigger? and isnt it in a spiral shape? and spirals usualy mean spining. so the sun is moving, but we are moving with it. and by the fact i made about the moon moveing away, i ment it like, if teh moon is moveing away. then other things are slowly inching away too, it has to be. and if all these things are inching away, then in return, its expanding. right?

ob1, yes, life was probably seeded here from elsewhere in the universe. It is one of the only plausible theories. It is called Panspermia, and involves meteorites containing dormant bacteria (or similar) crashing into the earth, thus bringing life to the primordial soup.

hmm interesting theory Tyler. Have you ever read any of Professor Hawkings work?

i have another strange theory, but 1st, i must explainfew things 1st.
you probably know that matter is constitued of atoms.
any atom is made with neutrons(neutral electric charge) protons(positive charge) and electrons flying around.
there is also antimatter( dunno if it's the right english word).
there r antiatoms made of antiprtons(negative) still neutrons and positive antielectrons flying around.
when u put matter and antimatter together, u'll get pure energy(given by the formula E=mC²), and that reaction can be reversed:
energy->matter+antimatter.
some scientists think that antimatter is matter going time backward...
so here's my theory: what if time was cyclic? what if the 3dimensional universe we know is a cyclic part of a 4dim (like a circle in the plan or a sphere in 3D space)?
BigBang may have been a giant reaction energy->mat+antimat that throw matter in 1 directing in time, antimatter in the other...
and the antimatter we meet came from the gnabgib in our future but that is the bigbang in its past...

Man...now this really gets to me. I was all lubed up... ready to go. Came in here thinking that Darkadmin was about to blab about some crazy orgy or something and what do I find? ..... nothing but you guys bragging on about neutrons, atoms, anti-matter, etc and how or why the universe exists. Well I wonder who's going to get a microscope for Xmas this year?

Lighten up guy's... we all are here for a short time, So you better make it a good time. (even some of you fools that think in your own mind that you are immortal )

I read this great story once of how and why the Universe was created and let me tell you, it beats any theory you lot have just talked about and it’s based on a true story….really it is!

Here is the link
http://www.acrimony.org/article_fallen_halo.php

*Watches whitesoul stroke Dan's... ego * >:)

I just read Fallen Halo. Holy Moly Elder D! That was damn fine stuff!!!

im not interested in what happedned i want 2 find out what will happen and how we can prepare for it ect

what will happen that is big bang related won't have consequences on your life...
whenever it does, human beings can do nothing about it...
only to ^prepare 4 its is to prepare 4 death...

which btw, Dan... theyre remaking into movie=)

Yes, Yes, I know. Happy Dan.
It's a shame it didn't come together before Douglas passed, though.

im the only one who does not believe god made earth in my school, im more into it was something to deal with science like evolution i dont believe in adam and eve, i believe we all formed from monkeys which most people think im dumb but i go for what i believe in

I don't know much about sciences but the question how the universe originated etc...was always in my mind and always tought about it whenever I have a 'reflecting-thinking time' hehe.

wow..incredible to fathom what my have exsisted before the universe....

What existed is something that all of us can dream about, but will never truely know. I often wonder about that to, and I hope one day that I will be able to understand more about it, and that everyone else will to.

Wow. This one got dug out from way back.

What if the Big Bang and resulting expansion of the universe is really only a small part of the universe?

"Space is big. Really big. You just won't believe how vastly hugely mind-
bogglingly big it is. I mean, you may think it's a long way down the road to
the chemist, but that's just peanuts to space. Listen..."

Just because the entire part of the universe that we can see is expanding from a Big Bang, who's to say there isn't much more to the universe beyond that?
Perhaps, in distant areas of the universe, there aren't other places where a big bang has occured, and matter is expanding outward from those points. And that there are other points that this expanding matter is being drawn to. Perhaps this is the cause of the acceleration of our part of the universe expanding. Matter being drawn to other points at a growing rate. Gnab Gib. And eventually, enough matter gets drawn into that point to essentially hit critical mass. Big Bang. This would correlate with most things in the universe following some sort of cycle and balance

not realy sure what to think though im rather sceptical

i dunno...

i dont think the experts no what caused the world to exspand i for sure as hell dont

I strongly believe in that theory. i mean what other reason would the universe start. i seee no other explanation

wow..... where's my brains when i need them..... as it was said before.... there was two dimentions at play..... side by side.... and waves like a ocean waves...
intill they hit each other..... and thats where the big bang came from.... so i heard from a show i seen.... and the universes are expanding.... moveing away from each other are moveing faster as they go....

The Big Bang theory used by scientists does exist, yet at the same time, can make no sense. The size of a grain of sand, it would have to have been sucked together by a force that only a gravitational pull could create, which leads me to believe that another universe was created, expanded, and then had been pulled back together by gravity, and this will happen again, creating a brand new universe, making the world, literally go round, over and over again.

REALLY DON'T KNOW WHAT TO SAY BUT AT THE END I THINK THAT IT IS THE END OF THE WORLD I THINK. BUT BEFORE THE END I HOPE THAT WE ALL HAVE THE BEST TIME OF OUR LIFES