We understand the truth of the world. The magic weapon for the truth of all things is science, and science is based on physical laws. These physical laws are not created by humans. They appear with the birth of the universe. They are various laws of the universe , laws of nature.
The laws of physics allow us to understand the essence of things step by step and understand some of the truth behind the universe. Many people may think that the discovery of each physical law will excite humans, which means that we will take another step from the final truth. However, the discovery of a physical law makes us feel desperate. Many scientists say: I would rather never discover this physical law.
This physics law that makes people despair is the second law of thermodynamics , or it is called entropy increase law . The law of entropy increases tells us that in an isolated system, things will become worse and worse over time, becoming more and more chaotic, until they finally move towards nirvana.
Each celestial body is an isolated system, so there is no eternal celestial body. Whether it is a planet, a star or a powerful black hole, they will eventually go to destruction, but the process they go through is different, and the time to reach the end is also different.
stars will evolve step by step into nebula or neutron star and black holes as the internal hydrogen element continues to deplete, and black holes are also not eternal. They are also constantly radiating Hawking, which will continue to evaporate mass and eventually disappear.
Many friends see this, perhaps saying that as various celestial bodies continue to move towards the end, and eventually all black holes evaporate after mass, the universe will no longer have stars, and will fall into darkness. There is no photon , leaving only endless darkness and cold. So is this really the case? The results may have been beyond the expectations of many people.
If the universe is all composed of visible matter, then under the influence of the law of entropy, the outcome of the universe will be the same as many friends imagined. However, as cosmologists continue to deepen their research on universe exploration , they discovered a fact that surprised us, that is, the universe is composed of visible matter and invisible matter.
Invisible matter is the dark matter and dark energy that we all know. They account for 26.8% and 68.3% of the total mass of the universe respectively, while visible matter accounts for only 4.9%. It can be seen that the invisible matter that really dominates the universe is.
dark matter and dark energy cannot be truly observed with human current technological strength, but the changes in gravity cannot hide them, which still allows scientists to discover the fact that they exist and some impact on the universe.
According to current research on dark matter and dark energy, there is dark matter around each large galaxy that is several times the mass of galaxy. They surround the entire galaxy and dominate the operation of the galaxy.
The role of dark matter and dark energy is also different. Dark matter constructs the framework of the universe, stabilizes the structure of the universe, and allows the stars in the galaxy to run stably without falling apart. dark energy occupies a driving force for the continuous expansion of the universe space, allowing the distance between galaxies to continue to expand, and the final outcome of the universe is also closely related to dark energy.
The accelerated expansion of the universe will keep galaxies away from each other. After reaching a certain level, the speed of distance will exceed the speed of light. At that time, the galaxies will be completely hidden and we will not be able to observe. Scientists believe that in the infinite future, the starry sky above our heads will not be able to see any star, and the entire starry sky will be completely trapped in darkness.
Dark energy not only drives the expansion of the universe, but also pulls celestial bodies during the expansion process, and matter continues to separate. As time goes by, the pulling level of dark matter will become smaller and smaller, from the current million-light-year scale to the hundred thousand-year scale, and a large number of galaxies fall apart.
In the end, the gravitational pull brought by dark matter driven by space expansion will shrink to the planet level, atom level, at that time, the entire macroscopic material world will completely collapse and no longer exist, leaving only the low-energy microscopic world.
And the expansion of the universe cannot be infinitely limited. After reaching the limit, the speed will continue to drop, and then it will become a slowdown, shrinking from the original expansion inward. In the end, all matter will gather together again to form an singularity , and a big explosion occurs again, and a new universe is born, and the above process is repeated. Scientists also call cosmic processes such as
. Our current universe may be born after the last universe reached its end. If so, where will the future of mankind go?
If the universe is unique, no matter how advanced human beings are, no matter how advanced technology is, they cannot stop the destruction of the universe and the end of human beings. This is the rule formulated by the law of entropy increase, and it is the most core law of the universe and cannot be changed.
Under the uniqueness of the universe, the fate of human beings will be closely bound to the universe. The universe will be destroyed and human beings will end, but what if the universe is not the only one? Now some scientists have proposed multiverse theory, believing that there is a vast space outside our universe, and there are countless universes, and our universe is just one of them.
If the universe is diverse, then the future of mankind will be full of variables, and it is possible to transcend the universe. Before the universe is destroyed, leave this space and go to the new universe to survive, or temporarily take refuge outside the universe. After the new universe evolves, we will return to this space. There is no conclusion yet on whether the multivariate theory is correct. Of course, it is not a nonsense without evidence. Some scientists have discovered some special features of the background radiation of the universe through observations, believing that it was caused by the collision between other universes and our universe in the early days of the universe.
If we can determine that those special features are indeed caused by the collision of the universe, then there will be affirmative evidence for multiverse theory, which will be good news for human beings. We don’t have to worry about ending with the end of the universe. Only human technology is strong enough, and we are fully capable of walking out of this universe and developing a more prosperous universe.
Of course, it is not easy to achieve such a goal. For today's human beings, it is too far away, just like a myth. After all, in our current cognition, the universe is too large to imagine, and the range of activities that humans can move will be limited to the solar system for a long time in the future.
