What is the universe like, the ancients often asked. In order to explain the formation of the universe, astronomical observations were made. However, the truth about the universe has never been resolved. Throughout the ages, it has been said that the universe, up and down, left and right, has been called the universe. In the face of its immensity, people do not care about self-pity. Astronomers observe the sky with simple self-control, leaving us with precious spiritual wealth. From Ptolemy's geocentrism to Copernicus's heliocentrism, the debate about the center of the universe never ceases. To this day, astronomers are not sure where the center of the universe is. However, it is certain that its center is not in the Milky Way. The current observable universe is about 13 billion light-years in diameter, and there are many planets within it. However, we have never found any aliens. Of course, this is off topic. How do astronomers study the universe? The original theory was that the universe was isotropic. It's like a hive with a lot of regular hexagonal lattices, and each hexagon is connected to the whole. We know that the speed of light is the fastest in the universe, which is indicated by Einstein's mass-energy formula. And in space exploration, measuring the distance between two planets is achieved by light. In ancient times, there was a Greek mathematician and philosopher who used the resemblance of shadows to objects at noon. He then measured the pyramid of Khufu in Egypt according to the similarity triangle theorem.

Some people say, why is it that there are so many objects in the universe that are infinitely dense singularities with no length, width, or height? I think it's easy to understand by numbers. What is Zero? Most people must say no. But that's true. In temperature, zero degree is not the smallest temperature. Whereas, in terms of particle spin, there are also objects where the spin is zero. My guess is that there are multiple zeros in the singularity, but these zeros don't mean there aren't.

I've seen explanations of the Big Bang. He said it all started with Albert Einstein. Didn't he create the theory of relativity? Based on the theory of relativity, he came to the conclusion that the universe was expanding. And by expanding backwards, we can know that the universe began with the Big Bang.

Didn't I say earlier that measurements should be taken out? Astronomers believe that the light of the Big Bang is still moving in the universe and has not reached the Earth. However, they discovered cosmic microwave radiation. Formally, this radiation led astronomers to believe that it was feasible to measure the size of the universe and study the universe.

The question is why the earth is not torn apart if it is expanding? What is the answer? Physicists speculate that it is likely to be dark matter and dark energy. Since they do not interact with particles, they have not yet been found. However, they have reason to believe that it is the two of them.

Back to the Big Bang. There is a TV series in the United States called "The Big Bang Theory", and the Big Bang here comes from the Big Bang. Some people think, since it was the Big Bang, what was it like before the Big Bang? Actually, you can't look at it that way. Because the universe is the top-level collection, there is no greater space than it. So, there is no time before the Big Bang.

On a whim, I can't help it. Well, that's it for today! Mizukawa said.

The three of them were also busy with their own business, and the place suddenly fell silent. It's a little scary, it's a little weird.