With the gradual development of human science, the problems that human beings need to solve are not reduced, but more and more. The original human beings only need to think about the problems on the earth and change the environment on the earth with science and technology to make the earth more suitable for human survival. But with the progress of science step by step, we find that there is a wider space outside the earth.
Humans once thought that the earth was the center of the universe, or that the sun was the center of the universe, namely "geocentric theory" and "Heliocentrism". Although these two viewpoints are wrong, the concept of "universe" has been preliminarily answered and studied in these two viewpoints. The "Heliocentrism" viewpoint has speculated on gravity and pointed out that all planets revolve around the sun.
But with the development of cosmology, the study of the universe is getting deeper and deeper. We find that the solar system is not special in the universe. There are countless stars like the sun in the universe, many of which are bigger and brighter than the sun. Rocky planets like the earth are not uncommon in the universe. At present, scientists have discovered many planets very similar to the earth, and they may all become human colonies in the future.
"The more you know, the more problems and difficulties you have." Once, human beings only had to think about how to "live" and "live better". Now human beings have to think about "What is the universe?" "The meaning of human existence", these unexplained problems, the increase of knowledge did not bring happiness, but brought us a lot of troubles.
Human understanding of the universe is mainly based on the progress of physics, and the study of ancient Greek philosophers is the initial bud of physics. With Galileo's creation of the modern scientific system, mankind officially opened the door to "science", and then Newton brought a "classical mechanics" system to the world. Although there are some loopholes in classical mechanics from now on, it has played a huge role in correctly understanding the universe. The concepts of gravity and inertia have been deeply rooted in people's hearts and improved the overall cognition of human beings.
At present, most people's view of the universe only stays in the perspective of classical mechanics. This is because classical mechanics is closer to life and does not violate our common sense. However, science can't stay on a theory all the time. There will always be new theories to replace and overthrow the old ones. In science, there can be no "eternal truth". With the deepening of research, "everything is possible".
So, what are the limitations of Newton's classical mechanics? We know that if the two pillars of physics are "quantum mechanics" and "relativity", one is to study the microscopic world, and the other is to think about the temporal and spatial changes at high speed, and in both cases, classical mechanics has exposed great limitations, so classical mechanics is only applicable to the macroscopic world and low speed.
Because our life is far away from the speed of light and the micro-world, many physical theories are "against common sense" in our view. For example, the fastest speed of the universe is "the speed of light", and it is impossible to appear faster than the speed of light. Any speed and speed of light can only get the speed of light, but when flying at the speed of light, the concepts of "time" and "space" will be relatively vague, and only the speed of light is the only constant quantification. In classical mechanics, it is assumed that time and space are.
It can be said that Einstein's research subverts the position of classical mechanics in physics, and people have a deeper understanding of the universe, but there are also more problems. Relativity and quantum mechanics are contradictory, and the two theories cannot explain each other. Even the world views in the two universes are completely different. In quantum mechanics, everything in the universe is random, and everything depends on probability. However, Einstein believes that everything in the universe is "designed" and we can.
"God can't roll the dice" is Einstein's famous saying. Many people think that this is evidence that Einstein attacked quantum mechanics. In fact, Einstein is willing to admit that "uncertainty" is indeed the inherent attribute of the universe in the micro-world, but Einstein suspects that "uncertainty" of quantum mechanics is indeed the inherent attribute of the universe. But this phenomenon also points out that there are deeper theories buried in quantum mechanics, which have not been discovered by human beings.
Until his death, Einstein was studying and looking for the "great unification theory", trying to crack the secret of the nature of the universe and find a theory that can unify the four basic forces, but Einstein failed, and even today, scientists have not found a real great unification theory.
Einstein said that "everything has a destiny". This sentence is actually the same as God's failure to roll the dice. Not attacking the current physical theory, but clarifying one's own world view. Einstein's cosmology is "a mechanistic cosmology". The universe is like a mechanical clock. BIGBANG's energy provides this clock with almost endless power, so that this clock can go on. When the second hand drops every second, everything in the next second is decided.
However, quantum mechanics has a different view of the universe. In quantum mechanics, everything in the universe is "inconclusive", just like God randomly throws everything with dice. Obviously, Einstein did not recognize this view of the universe. In his later years, Einstein has been looking for a grand unified theory and proving his view of the universe. Unfortunately, even a genius like Einstein did not succeed.
Humans can really find the theory of "great unification", perhaps in the future. Now human beings have experienced a period of rapid development for hundreds of years, and it takes time to digest and accumulate in order to breed a more correct theory.