When will our expanding universe come to a halt;and if so will it collapse inward,towards its point of origin?
Current theory has it that the universe is expanding at a faster rate than in the past. In this case, it will not halt and collapse, but will expand to a point where everything will be so far apart from everything else that it will become quite dark and desolate. Don't worry, we're talking trillions of years here.
Does the Universe expand because of diffusion and not Big Bang?
The big bang was not an explosion of matter into existing space. So the initiation and expansion of the universe is not akin to releasing compressed gas into an infinity of existing ambient space. The Bing bang was the spontaneous birth of the matter, energy and space of our Universe. In other words space itself came into existence along with everything else. And as it happens, the amount of space continues to grow where as the amount of classic matter and energy appears to not grow. So there is a kind of diffusion going on, it is not matter spreading into unused space, it is matter being carried away by the expansion of space. Imagine a latex balloon covered with dots. Inflate the balloon and the dots move away from each other. Dots adjacent to one another don't move very far apart, dots on opposite sides move apart much faster and more quickly. So it is not that the dots are moving - it is that the medium the dots occupy is expanding. The more of that medium there is between any 2 dots, the further and faster they move away from each other as the medium inflates. So that is what is happening in our universe. Space is expanding. The more space there is between us and and distant object the more magnified are the cumulative effects of the expansion. What we refer to as dark energy is whatever the force is that is causing the expansion of space.
Atheists what do you have to say about the quran mentioning Big Bang?
Some argue the Qur'an supports the theory of an expanding universe. It says (51:47), "And it is We who have constructed the heaven with might, and verily, it is We who are steadily expanding it." However, the following alternate translations say; YUSUFALI: With power and skill did We construct the Firmament: for it is We Who create the vastness of pace. PICKTHAL: We have built the heaven with might, and We it is Who make the vast extent (thereof). SHAKIR: And the heaven, We raised it high with power, and most surely We are the makers of things ample. It seems the "expansion" interpretation was not noticed until after the expansion theory became well known. How convenient that you are able to re-define the meanings of these ancient words to suit whatever updated interpretation you wish to apply to support your claims. Too bad there are so many older interpretations that did not share your opinion about the intended meaning.
How was the Big Bang's expansion faster than the speed of light?
Matter can not travel faster than the speed of light. The expansion however was not a transfer of matter to one place to another, but rather the expansion of space between the matter, with the matter not moving at all (well, they might have been moving somewhat). Therefore, the matter itself did not break any laws of physics, and still don't.Another way of seeing this is the example of the balloon which you draw dots on. If you blow the balloon up, the dots will appear to move away from each other where in reality, they haven't moved at all. It's due to the inflation of the balloon, that the space between them increased at the said rate (the rate you were blowing at). Since there's no movement of matter at a rate faster than c (speed of light), no laws are broken.
Did the big bang theory create the universe?
Big bang theory explains how the universe formed, starting from a small, dense, hot singularity which expanded. There's a ton of evidence to support this, and 'theory' in science does not mean 'guess'. It means 'everything we know about this subject'. If your teacher is seriously telling you that, your teacher is not qualified to teach science and you need to complain to the school board about (a) unqualified teachers and (b) violations of your constitutional rights. No, the big bang didn't create people. People evolved from lower orders of life about 13.7 billion years after the big bang. The big bang created our universe; everything in it came from the basic laws of physics, chemistry, and later biology, including you.
Is the Big Bang Theory really plausible?
All the evidence we have currently points to at least a version of the Big Bang. The problem with it is the name itself. It wasn't a bang in the conventional sense, but was a derisory name given to it by Fred Hoyle, a British astronomer who never believed in it. Rather, it is seen as a sudden expansion of space and time from a point of infinitesimal size. Most cosmologists recognize there are problems with the theory, and so details will change many times before we think we have even the detail exactly right. Your point about the creation of matter is valid, once the Big Bang has taken place. However, at the initial singularity, what we know as the laws of physics in our Universe did not exist, so anything could have happened. Indeed, quantum mechanics tells us particles are continuously blinking in and out of existence from the underlying quantum foam. However, what seems to me a more plausible idea is my current area of research called M Theory. It is a development of string theory, and explains many anomalies we find in the every-day Universe we all know and love. M Theory postulates the existence of a sort of super universe, which we call the Multiverse, which contains a possible very large number of universes, some similar to our own, and some very very different. Doing the maths gives us a number of universes as something like 10 to the 10 to the 10 to the 10 to the 10 to the 10 to the 10 to the 10 to the 8th power, or considerably more than the number of grains of sand on the Earth! The inflation of the early Universe overcame gravity by happening at must faster than the speed of light, and as this involved space itself, rather than matter, is perfectly permissable under the laws of Relativity.