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We are all familiar with the word universe. With the development of science and technology and the improvement of people's cultural level, "universe" has gradually extended from houses in traditional culture to a larger concept of galaxy space.
The universe is composed of stars, planets, satellites and various substances we know, as well as many mysterious substances that cannot be detected with current science and technology. It is vast and boundless.
How long is the lifespan of the universe?
If you want to know the age of a tree, look at its gears; if you want to know the age of a horse, look at its teeth; if you want to know the age of an elder, just listen patiently to the story of his life.
So how can we know the age of the universe?
In addition to age, what stage in life is the universe at? An elder or a vibrant young man? What stage of the universe are we in?
According to various models calculated by scientists, it is calculated that the universe we live in has a lifespan of 13.8 billion years. The universe may have originated from a big bang.
Just like Pangu in the mythical story of the creation of the world, 13.8 billion years ago, because of an "accident", there was a universe that we still don't know the whole picture of.
The theory of the origin of the universe by explosion is also a widely recognized view among many current theories of the origin of the universe.
After the big bang, it continued to expand in a very short period of time, continued to explode, continued to expand, and produced various radiations and energies. After various materials collided, they underwent a series of chemical reactions, and then after a very long evolution, we have the universe we have today.
Secondly, there is the theory of universe eternity and the theory of universe stratification, both of which have the views of idealism. Belief in the existence of the Creator may be the same as the views of many religions. Although they are not widely recognized by the scientific community, they have many followers.
For example, the theory of eternal universe believes that the present stable world is due to the Creator, so we must believe in the Creator.
The theory of universe layering believes that there are many lives in the universe, because everyone is in different "dimensions", so what they experience, see and have different abilities.
Many science fiction novels and movies are also based on this. For example, the book " Three Body " writes about the lives of beings in different dimensions of the universe from the perspective of universe layering. The six paths of reincarnation in Buddhism are basically the same point of view.
If the universe was really born in a big bang, and there are already 13.8 billion "old people", what is the concept? How does it compare to Earth?
Compared with the universe, the earth we live on is very young. The birth of the earth is only about 4.6 billion years ago, not to mention our own life, which lasts only a few decades. Compared with the vast universe, it is really a drop in the ocean.
According to the precise calculations of scientists, it is estimated that the universe will survive stably for at least another 24 billion years, which means that the current universe is still in its prime and has just completed the first half of its life.
Of course, our current understanding of the universe is still limited, and the theories of various schools and schools are still not unified. These statements cannot yet be regarded as conclusions. What will be the ending of the
universe?
Since it was mentioned that the universe may have a lifespan, it will be born and die, then how will this behemoth develop in the future? Although
is still controversial, the main guesses are as follows.
1. Proton decay
Although proton decay has not yet been confirmed, if the hypothesis is true, protons will become atoms and particles after decay. This conclusion will subvert our energy conservation law .
Protons are currently the most stable structure known and have a very long lifespan. If proton decay is confirmed, it will also indicate that the universe may gradually decline as a result. After all, the universe is constructed of protons.
However, even if protons will decay, the evolution process is very, very slow. At least in the long history of the past, no decaying protons have been found, so there is no need to worry too much.
2. Black hole evaporation
In the 1970s, Hawking discovered the black hole evaporation theory , and it was continuously verified in the following decades. As the most mysterious celestial body, black holes are constantly being unraveled by scientists.
In order to commemorate the great Hawking, this idea was later named "Hawking Radiation"
Hawking believed that if a black hole does not absorb other matter, it will disappear when its own mass is lost, and the black hole will gradually die.
The proposal of this theory has overturned the previous theory that the mass of black holes will not disappear or reduce. It is also proof of the continuous progress and development of science.
Although there are still many unknown areas for us, as long as there are more great scientists like Hawking, the mysteries can always be solved one by one.
What will happen after the black hole evaporates? It may form a "dark black hole cloud" and become another dark matter in the universe that we don't understand.
3. The heat death of the universe
After the heat cools down, it becomes the Big Freeze, just like a burned-out candle. When one day our universe becomes darker and darker, that is, the day when the energy is exhausted, there will be no large planets, and it will be difficult for life to be born.
Is this possible?
It is quite possible. You must know that all chemical reactions and star movements in our universe are driven by energy. Only when there is a gap in energy can everything move. When pedestrians push the cart, it is the people who give the cart energy and generate potential energy, so that the cart can move.
But what should we do when one day this potential energy does not exist?
The entire universe can begin to "lie flat". If no one provides potential energy, it will become silent. No celestial bodies will move and no stars will shine.
4. Being torn apart by dark energy
Compared with the ending of the universe that may take a very long evolution process mentioned above, there may be a very rapid and exciting possibility.
As we all know, there is dark energy in the universe that can drive motion, which cannot be detected and utilized by humankind's current science and technology.
The proposer of the theory of dark energy in the universe is the famous Einstein, and it is also part of his theory of relativity. This energy is not only dangerous and powerful, it can even swallow dark matter .
According to the current confidential model of scientists, when dark energy continues to grow, it is likely to cause the universe to become unbalanced and eventually be "torn apart" by dark energy. If there really is such a day, it may happen at the same speed as the Big Bang, and suddenly the universe will end.
However, no matter what kind of conjecture it is, it is very far away from us. Although we must be prepared to actively respond, continue to live a good life now!
