The term big bang has many meanings, and what astronomers mean when they refer to the theory of the Big Bang of the universe is the idea that the universe is expanding.
Edwin Hubble first noticed this in the 1920s when he discovered that galaxies were moving away from each other and rapidly increasing. This discovery led to several subsequent conclusions that in the past galaxies in the universe were closer together and the universe was thicker, warmer and more compact, Will become less heat and density.
Going back to the distant past in the history of the universe, we will reach a special time when the density and heat are infinite, and Einstein's theory of gravity gives us a way to calculate when this infinity occurred, only 13.7 billion years ago. This is a very interesting result because you can walk around some places in Scandinavia and Scotland and pick up 3 billion-year-old rocks. Scientists believe that the entire solar system is about 4.6 billion years old, so we seem to be very close to what might be the beginning of everything.
Here scientists are concerned that the prospect of something infinite is often a sign that the theory you are using has reached the limits of its applicability. For example, imagine that you are an aerodynamic engineer. You are expected to predict the velocity of the airflow, if your model is very simple, ignoring the forces of friction, and then you find that something is changing at an unlimited speed within a specified time. Then no other engineer will believe that this will really happen and this result will be seen as proof that you have to go back to the beginning and improve the model slightly, by taking air friction into account. When you return to the equations you will find that something is changing very quickly but the speed is not as unlimited as I had previously expected.
So the work of astronomers today is focused on finding a possible expansion of Einstein's theory of gravity to include quantum theory, which can give a more accurate description of the beginning of the universe. No one knows exactly how to do this as this is the current search domain. Some theories predict that the universe has no beginning at all, that the universe shrinks and expands periodically, or reverts to expansion only once and will continue to expand forever. Another possibility is that the universe began from a fixed state that is not important and then began to expand due to the influence of quantum fluctuations. In this scenario expansion has a beginning, but the universe itself does not necessarily have a beginning.
The inflationary universe:
There have been strange possibilities in the past ten years associated with the idea of multicolored. The universe may be one of several universes. More specifically, we may have a part of the universe that behaves differently than other parts. Imagine the universe expanding in different ways in different places. In some places it is a bit colder like the part we live in but anywhere else it may be much hotter and may collapse in some parts instead of expanding. If the universe is infinite there will be no limits to the possible field of variation in different parts.
This type of scenario emerged from the theory of the inflationary universe, which largely explains many of the characteristics we observe in the visible part of the universe. The theory assumes that in the very, very distant past there was a short period of time when the expansion of the universe accelerated at an expansion rate very close to what we observed today. It also sets out predictions of small fluctuations and differences in density and temperature that we can know today such as galaxies and stars. The test of this theory is achieved using satellites and has succeeded from all the tests that have been developed so far, since there was a very good consensus between observations and theory.
But there is a controversial aspect of the inflationary universe theory that the rush at the beginning of the explosion and the expansion should affect different parts of the universe in different ways, if we can see far enough in the universe, we will eventually see areas of different density than we see in our nearby (14 billion light-years).
Cosmic bubbles:
The other side that astronomers have discovered for inflation theory is that the early expansion of the expansion can become permanent in every part of the universe, and when a part of the universe bursts into it, another small part will suddenly erupt again. Such as foam and bubbles where each bubble creates more bubbles that also expand. You must think of the entire visible part of the universe as one bubble in the foam.
If we look outside our bubble we will see another bubble in the foam where the conditions are different.
One of the most shocking things about foam is that the entire process does not need a specific beginning or end. In fact, the equations you describe appear to be endless, and almost certainly not as a beginning. But each bubble is as separate as the one in which we have a beginning and may also have an end. So the answer is whether the universe has a more complex beginning. The life cycle of a bubble is like that of the human race. Everyone has a specific life span, but our presence as human beings is much greater. So the new possibility that the universe will be very different if we look at it widely enough and its history is very complex. Before the clear beginning of our part of the universe there was a "quantum foam" that made up our universe and there may be many universes that are very different in structure.
Scientists believe that the theory of the inflationary universe carries a large part of the truth, because its predictions fit the observations of scientists well. There is some confidence that our own part of the universe has undergone this expansion.
Our bubble:
The bubble theory assumes that the bloated bubbles are very different from one another. There are only a few bubbles that can be found in them. They only last for a second, not like ours. We live in a long bubble lasting at least 10 billion years. Long to provide elements such as carbon, nitrogen, oxygen and formation, we must be in a big bubble, old and cool.
There is an interesting unresolved problem of the possibility of bubbles with certain characteristics. What is the probability that we will have a large, durable bubble of the kind that allows for life? Is this unlikely? Is it possible to some degree? This is one of the problems that we hope will soon be resolved by shaping the possibility in this global situation.
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