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The Big Bang theory is science's best explanation of how the universe was created. The theory asserts that our entire universe was created when a tiny (billions of times smaller than a proton), super-dense, super-hot mass exploded and began expanding very rapidly, eventually cooling and forming into the stars and galaxies with which we are familiar. This event is said to have happened approximately 15 billion years ago. Rather than expanding outward into some preexisting vacuum, the event of the Big Bang was space itself expanding - perhaps at speeds greater than light. (While Einstein's theory of relativity forbids anything within space from travelling faster than light, it sets no limitations on how fast the fabric of space itself may expand.)
The Big Bang theory was originally developed in the late 1920s by Georges-Henri Lemaître, a Belgian Catholic priest and astronomer, an early advocate of solutions to the general relativity field equations which predicted our universe was expanding. (For cosmological theories to be taken seriously, they must pose possible solutions to Einstein's general relativity field equations.) Though the expanding-universe solution to the field equations was derived by the Russian cosmologist Alexander Friedman in 1922, Lemaître was the first to realize that a continuously expanding universe implies that at some point in the past the universe must have been much denser and smaller, even atom-sized.
The Big Bang theory is supported primarily by two major lines of evidence - first, the fact that all galaxies are rapidly moving away from each other (confirmed by Edwin Hubble in 1929), and secondly, the presence of the cosmic microwave background radiation, or the "echo" of the Big Bang. The cosmic microwave background radiation was not discovered until 1965, and up to this point, scientists were divided between the Big Bang theory and its rival, Fred Hoyle's steady state model, which asserted that the universe was expanding, but staying basically the same because new matter was continuously being created.
Since the late 1960s, the Big Bang theory has been the dominant explanation for the birth of our universe. Fred Hoyle's steady state model has been discarded. Most of cosmology since that time has consisted of modifications and extensions of Big Bang theory. Because physicists have not yet formulated a consistent theory that explains how gravity operates on extremely small scales (like those present at the instant of the Big Bang), cosmologists are unable to formulate theories as to what happened before about 10^-43 seconds after the Big Bang. Our universe may have originated as a pointlike entity with nearly-infinite density, or perhaps something else. Our mathematics, instruments, and scientific methodologies may need to be substantially improved before any further progress is made.
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Posted by: anon20407
In response to anon18773, we mortals do not have nor ever will have an understanding of the total universe and God. We only have concepts based on belief. This is where the infinity of time and space is which we can never comprehend.
Posted by: Evan
For a discussion that is suppose to about the “big bang” one could say that it has degraded to nonsense. I would defy any and all to pose a definitively logical argument for or against the existence of a god. If not then shut up about it because this really lies in the realm of the philosophy of religion or theology, not science. In reality they are none, I’ve read them all, no theist or atheist be it Anselm’s ontological argument for or Richard Dawkins atheistic theory against has ever put for any facts that can definitively prove or disprove the existence of a god. Their all simply beliefs based on faith nothing more, nothing less. But I digress, in this past century; we have learned how stars shine for billions of years and how the elements were formed. The known universe went from the Milky Way and an Earth a few million years old, to a vast structure of galactic clusters, quasars, pulsars, black holes, and gamma ray bursts that have evolved over a period of time of roughly 12-15 billion years. The “Big Bang” is a theoretical event that originated from an infinitely hot and infinitely dense singularity that rapidly expanded to create all the matter in the known universe, a spontaneous quantum fluctuation that created the structure and physical laws of the universe, and the beginning of space and time as we know it, all of this evolving through the material processes of self-organization. Our universe continues to expand and cool to this day, we live on a unique planet, circling a beautiful star clustered together with several hundred billion other stars in a galaxy soaring through the cosmos of an expanding universe. The adventure of ideas in physics and astronomy has been enormously mind-expanding. I believe that space is finite, because it has been expanding at a finite rate for a finite time. In essence one must come to the understanding that you can either choose to believe that matter has existed for infinity or you can choose to believe that matter is causal in nature, meaning that there was nothing then a cause occurred bring matter into existence. At this point we don’t know exactly how this happened what we do know is we are here now, we exist and the physical universe exists. It really doesn’t necessarily matter whether or not you believe in a god, gods, or a particular philosophy the fact is we do exist period. Life does exist on this planet, in this solar system, and there’s a good chance it exist else where in this universe. The bigger question now is where do we go from here?
Posted by: anon18773
If you are going to say that god created everything, then what created god?
Posted by: confusedchic
i have a few questions about what anon7798 posted. you figure if the big bang theory is really what created earth....what created man? science suggests apes...well, what created the apes?....did they evolve from stars and gases and dust particles and such? one way or another there has to be a higher power. in other words GOD. He had to create something that lived for all of us to be here. but i would love to hear feedback about what you think happened. if the big bang created earth and all solar systems and such...what created LIFE?
Posted by: anon7798
It's true though, religion and science always argue with each other. i mean, scientists think that we came from apes, and religious people think it was god and adam and eve. SO what is the truth?sometimes i think that the monkey discovery seems more realistic, although there most likely is a god.
Posted by: Evan
Maybe all of you should look into string theory it in fact does have a very plausible explanation of how the Big Bang occurred.
As for God, whether or not he exists it's best to leave that out of these discussions, it has no bearing on the subject matter.
Posted by: anon4229
There is in fact a God and only one God, you look at all the big religions of this world and most of them believe in a God. This big bang theory proves that there most be a God because how could the big bang have gone off? Or how could the tiny protons have gotten there? This must mean God has created science.
Posted by: anon2440
science and religion need to stop fighting with each other. science doesn't disprove God, it proves the process of God's actions.
the big bang could be God's process of how He created the earth. Ok, so we all know what happened in the big bang, but does anybody know what CAUSED it to happen?
Posted by: anon1863
Tbh, bringing religion into this discussion is completely obsurd. This theory, if proven correct will pretty much decimate any faith in religion. Im not an atheist but i hold an open mind to the realisation that god may not exist. Science may also be completely wrong. As for the first persons question, you have a good point there, is there a limit to how much mass there is in our universe? tho when you ask does space end? i think we need to find where space begins before anyone can even attempt to judge that. Personally i can understand why we as humans who live with limitations can't comprehend how something can just never come to an end but without driving yourself insane thinking about this, you may aswell just stop this trail of thought becuase it would take us over 2 million years to reach Andromeda (our nearest solar system) which means we're never going to explore far enough to ever find an end to the universe, and what will we find at the end? see what im saying...some things will never be discovered. If Einstein's theory of relativity is correct then it is going to be seriously difficult to ever explore even Andromeda let alone anywhere else in this universe seeing as once something acheives the speed of light, it's changed into energy, even if Cryo-stasis is greatly improved, there is just to much that could go wrong with some kind of auto-pilot, comets, black holes, solar flares, planetary bodies not discovered on our set course. 2 million years of cryo-stasis wouldn't be possible. Worm holes are the only real way i can think of that kind of exploration ever becoming a possibilty and even then there are so many things we dont understand about them, infact we barely even know if they exist. It's great to ask questions but there's no point in driving yourself nuts asking questions that are impossible to answer with our current knowledge. Thanks, hope you enjoyed reading what i had to say :)
Posted by: anon575
hello,
the theory of expansion of earth. and the big bang theory is there in holyQuran. every thing created by god only.believe. believe some truths.some will take time to understand but truth is allways truth.our life time is toooooo small to research and find out some hidden truths .from micro to macro.if u can u you will reach an ultimate truth.that is god .god gives you brain to think.now he is giving another opportunity........a life after death is waiting for us .be prepare for that.Quran,bible, injeel, touraath, etc, are the informations of God. Man made changes in each except Quran. God is great.
Posted by: anon560
So does this mean that there is a certain amount of matter that exists? Because when that super-dense super-hot mass expanded there must have been a limit to how dense it was....does that mean that space ends? Where does space end? Can it really go on forever? If not what is at the end?
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