.

On this day, in the lecture hall, children were playing and playing. Senior Brother Jin Chan walked in and patted the bookcase a few times with the ring ruler, "Quiet and quiet,...... Today's class is free discussion, and the master will come later, so please prepare your questions. ”

The children immediately quieted down, returned to their original positions, and prepared for the lesson.

After a while, the old man Yichen held a ruby red vermilion pot with a dignified and steady shape and a full and round body in his left hand, walked in calmly, beckoned everyone to sit down, and sat on the futon on the podium himself, took a sip of the Buddha in the pot and jumped over the wall, and said: "Children, today's lesson is a free discussion, are you ready?"

"Hello Master, we are ready. The children stood up, bowed to Master, and sat down on the floor.

"Hello everyone. So let's start now, who's going to come first?"

"Master, how can we understand time correctly?" asked a child named Amaterasu as he stood up.

"The cosmic world we live in is made up of eleven dimensions and is made up of planes of vibration. In these eleven dimensions, time and space-time are not the same, and if you want to understand the concept of space-time, you need to cross the boundary of the third dimension and enter the fourth dimension to experience the relationship between time and space. Here, we assume that time is a pseudo-dimension, but like the flowing water in the long river of space, it is also a substance, but it cannot be seen or touched, and can only be perceived with the heart. Every species is accompanied by time from birth to physical annihilation. Every moment of every day after the birth of each species has neither a shorter nor a longer time, because with each moment of time, they will face the arrival of the next moment. It is impossible to grasp the lost and upcoming time, and only by grasping the fleeting time of the present moment can you welcome the coming time and fully enjoy that moment of perception.

"I understand that only by living in the present can we enjoy the future. Thank you, Master!" Amaterasu bowed to Master and sat down on the floor.

Shichuan stood up, bowed to Master, and said, "Master, when I was studying Taoism, I had a lot of questions about cosmology such as aligning matter, nature, and all things in heaven and earth. ”

"Well, then you can tell me about it. The old man looked at Shichuan, smiled, and said warmly.

"Yes, Master. First question: How is the cosmic world maintained? Is there any energy at work? If so, how can I cultivate it? Master, many times, when I observe the starry sky, there are many stars in the night sky. According to Master's description of the concept in your Sutra of Relative Meanings, the form of the cosmic world as we originally knew it was that the stars attracted each other through gravity, you revolve around me, I revolve around him, and the stars are busy and orderly. However, by observing and calculating the gravitational pull between the stars, I found that the gravitational pull of the stars themselves is far from enough to maintain a complete galaxy. If galaxies and stars were only supported by the gravitational pull of existing mass, the universe would be a plate of scattered sand. So, I don't understand why they didn't fly out?"

The old man took the teapot, took a sip on the spout, and said: "As far as the universe involved in Taoism is concerned, we can think that the reason why the universe can maintain the existing order can only be because there are other substances. And this kind of matter, so far, we have not seen and found, but it is not non-existent, here, we need to understand a concept, that is, existence is measured, and the matter that is not measured is not really non-existent, it is like nothingness, it is another form of existence, so we call it dark matter. In order to maintain the current order of the universe, the mass of dark matter must be five times that of the matter we see now. There is no real measurement of dark matter right now, just that light is deflected as it passes somewhere, and there is no matter in the area that we can see, and there are no black holes. Therefore, I don't know if you can get this kind of dark matter energy through cultivation, but everything is possible, you might as well try to find a relevant cultivation method, such as using the Great Law of Attracting the Stars of Qiankun, and then combining the concept of right and wrong in the theory of all things, and refer to it in detail, because the opposite of nothingness is existence, that is, nothingness and existence are dualistic one, and the two can be transformed into each other under certain conditions. ”

Shigawa continued to ask, "Oh, then I'll come down and try." Also, Master, are black holes dark matter?"

"It's not. A black hole just can't get light out at the speed of light, it emits other rays, and it's still regular matter. It is just an extremely dense celestial body that bends space-time infinitely. Such celestial energy is still an order of magnitude lower than the power of a super-god-level Saint Realm civilization. ”

"So, what's the point of exploring black holes, and what can studying black holes bring to our practice?"

"Shichuan apprentice, I can answer your question like this, let's first ask what we need, can studying black holes give us time travel, or interstellar world travel, or immortality? Sorry, the answer is neither...... So why do we still spend so much energy and hundreds of years on research? Because we need to explore, and exploration is the driving force that sustains us practitioners to go on and create miracles. Newly discovered areas have broadened our knowledge, from tiny quanta to the vast universe. We need to get closer to the truth, and then, choose how to use this knowledge to elevate our practice and repel the darkness that has never been seen before. Kid, do you understand?"

"Understood, Master, thank you!" Shikawa bowed deeply to Master and sat down on the floor thoughtfully.

"Master, I want to know how to calculate pi?" Spider, a little girl dressed in white, stood up and asked in a low voice, looking very shy.

"Well, this is easy, you can use the circumcision technique, from the beginning of the regular quadrilateral slowly expanding, until you count to tens of thousands of sides or more, infinitely close to a circle. It is based on this method that Zu Chongzhi uses the 12200 side type to cut the circle, and takes the diameter of 100 million as 1 zhang, and directly defines the pi as a certain number between 3.1415926 and 3.1415927. You can learn from it and try it with your cobwebs, so that you can also cultivate your patience and tenacity, haha......"

When everyone heard this, they couldn't help but laugh along with Master.

"Got it, thank you, Master. ...... You, you bully people, don't laugh! Master, look at them, you hate them,...... I'm still laughing and ignoring you. The little spider girl blushed, bowed to the master, and sat down busily, covering her face with her hands.

The old man picked up the teapot, took a sip on the spout, smiled at the children, and said, "Children, be quiet first." Let's move on, who's next?"

Shi Chuan stood up again at this time, a little cramped, and said, "Master, I still have a question......

"You ask, it's a good thing to have questions, it's good to be diligent and ask, let's applaud Shichuan. ”

The children applauded Shichuan.

"Master, some time ago, Senior Brother Jin Chan, Senior Brother Changfeng, and Senior Brother Fanxiang and I observed the stars beyond the Nine Heavens through the Heavenly Eye Telemirror in our back mountain, and found that when many stars, and even many galaxies and galaxy clusters are moving, the distance between them is constantly and gradually lengthening, like a balloon, constantly expanding, and it is accelerating expansion. If it's a constant rate of expansion, we can understand it, but accelerating expansion requires new energy, just like if we want to make a balloon bigger, we need to keep blowing gas into the balloon to expand energy, so what I want to ask is, what is this energy?"

"This energy is called dark energy for the time being. ”

"How much of this dark energy is there, can it be found and used?"

"To maintain this rate of expansion in the current universe, dark energy should be more than double the sum of existing matter and dark matter. It's just that we haven't found it yet, but based on the elaboration of the concept of generalized relativity in the "Two Meanings of Relativity", we can define our understanding of gravity - the distortion of space-time caused by massive matter. For example, when light passes through a black hole, it produces a gravitational lensing effect, which means that light will bend in space-time after bending. If there really is a strange substance, then the dark energy of this strange substance will also be affected and bent when it passes through the edge of the mass matter, so I suggest that you can strengthen the practice of curvature exercises, and then try to use this exercise to generate a super curvature driving force, bend and fold the space at a certain point, so that this dark energy in it can be gathered, or it can be found and used in our practice. ”

"Oh, got it, thank you, Master. Shichuan bowed to the master, sat down on the floor, turned the scroll of the "Eryi Relative Sutra" on the table to the fifth page, and studied the profound words.