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Some students asked me why we should think of the universe as a big explosion. How did scientists get this conclusion? To illustrate this problem, we must start with a scorpion. The conclusion that is completely opposite to the feeling of real life is that he said that if our conventional universe is steady-state, it is macroscopically that the universe is static and uniform and infinite. Infinite contains infinite space and infinite time. Then you are at night. When looking at the sky, the whole sky should be bright. This is who is the first big blast of Oberthurch. We have to say that this thing is still obtained by general relativity. Einstein proposed general relativity. General relativity was proposed from the beginning to explain the universe but it is regrettable that Einstein first proposed general relativity and thought that the universe was still stationary. So he introduced a thing called the cosmological constant to correct this model. After the static model was processed, there was a Russian scientist named Ya Alexander, Friedman, Alexander, he solved through Einstein's equation and found that if you think that the universe is not static and the universe is an expansion, then you don't need this cosmological constant. You can agree with Alexander. This conclusion is better than Einstein. A step further, and Einstein did admit that he was wrong. The biggest mistake in his life was that Einstein believed.