"The burning of the sun involves nuclear reactions, that is, the deterrence of human force, which will be discussed later," Leo said, "As for the divine realm and the astral realm, I am also wondering, you said that they are on the moon, and I am not sure if your planet has only one moon, after all, the soul out of body did not have time to see clearly, but I think it is unlikely, the elven myth says that the moon god is on the moon, and it can't be that the mother earth god and the human god of light are hiding on it, right?" Of course, I don't think it's possible for them to stay on the sun, I guess, it's on a planet or planet's moon that is closer to the sun, or even a comet, so that it can prove why the gods sometimes don't, but these are all speculations, and we need to prove it together! Including all other planes, they should all be planetary moons or asteroids, but your solar system has too many people in suitable places to live, according to this line of thought, the underworld may be a marginal planet far from the sun, the abyss of the demon world or something, it should be closer to the sun, so it will be so hot, and there is magma and sulfur everywhere......"

I wrote it down in my notes and said, "I want to participate in the research on these topics!" Give me another notebook! ”

Leo said, "I'm so relieved to see you so serious......

I said, "Don't you remember it yourself?" ”

Leo took out a "mobile phone" and said, "I've written it down, it's easier than yours!" ”

I said, "Okay, you're still building everything here anyway." ”

Leo said: "The main thing is that you don't understand its principle, and you can't use it." ”

I said, "That's not what I meant, it's good to take notes, and I'm more grounded." ”

On the screen, next to the Earth, the Moon and other planets are crowded together, indeed, not as big as the Sun.

Then, the image begins to zoom out again, the sun quickly shrinks to the lower left corner of the picture, the Earth and other planetary moons are reduced to the point where they are invisible, and then, a pale blue "sun" thousands of times larger than the sun occupies the main part of the picture.

Leo explained: "This is the size of other stars, much smaller than the sun, I won't let you see it, I forgot what this star is called, in short, it's big, but it's ......"

Before the words fell, the pale blue star became smaller, and the sun was as small as the Earth just now, and a huge pale orange star took the center of the picture again.

Leo explained lightly: "This is less than the largest star currently observed, with a radius of more than 2,000 times that of the Sun, and a difference in volume of about 4 billion times......"

I could see my hairs stand on end: "This, such a big ......"

Leo said: "Don't worry, the bigger the star, the shorter the lifespan, like this will not live more than 100 million years, our sun will not have a problem to live for 100 billion or 20 billion years, and dwarf stars smaller than the sun are said to live for hundreds of billions of years." ”

I said, "I'm afraid the unit of 100 million is commonly used in the universe, right?" ”

"It's about the same, but sometimes it's not enough, like astronomical units, the speed of light, and light years...... I'll tell you about it later, especially the speed of light, which is related to astronomy and physics, and even mathematics......"

I said, "No wonder you say that the universe is big......"

Leo said: "Not only is it big, but it is very empty, you don't look at the stars so big, in fact, all the matter scattered in them is like grabbing a handful of sand and throwing it in the air, insignificant!" The entire universe is almost empty, so the Chinese language calls it space! ”

Space, the universe, two words kept flashing in my mind.

At this time, the picture has taken on a new look.

In the picture, a glowing disc-shaped vortex appeared, and then, it began to "devour" the star!

To be precise, this "disk" does not swallow the star in one gulp, but tears it out and deforms it, pulls out a spiral of flame that is constantly rotating, and sucks it into the body little by little.

"This thing is called a black hole, and it is something that human beings on Earth have not yet understood," Leo said, "According to Newton's laws of mechanics and the theory that followed, when the ratio of volume to mass, that is, density, of an object reaches a certain limit, the attraction of external objects will become infinite, and then it will become a black hole, devouring everything!" ”

"Black hole......" I said, looking at the glowing disk, "doesn't it have color?" ”

"That's what I added, I'm afraid you can't see it clearly, in fact, it doesn't have any color, because even the light can't escape his devouring, no one can see it!" Leo said, "Humans can only guess his approximate location by observing the changes in the surrounding cosmic bodies by observing them!" ”

"How did such a terrible thing come about?" I asked.

"At present, it is the heavy nucleus produced after the burning out of some stars that causes the core to collapse, I said, the earthlings are still studying, just like you sigh at the sea and the starry sky, we have just crossed the ocean, flying outside the planet, many things, are just being studied, don't be afraid, the black hole is still far away from our planet, otherwise the main plane would have long since ceased to exist, I suspect that if those gods are aliens, it is likely that their planet is threatened by a black hole, so they ran away from you... …”

I was taken aback again.

"This is just my speculation, we need to prove it together," Leo said, "come, don't think so far, go back to the planet, and see the scientific and technological development of the earth......"

The screen flickered back to the vicinity of the Earth and the Moon.

I saw something fly out of the earth and land on the moon.

It's strange to hold something, like an irregular cylinder with sails hanging on either side.

After landing, two humans came out of the barrel, dressed very bloated, tightly wrapped, and the helmet part was enclosed in glass.

"It hasn't been long since humans landed on the moon," Leo said, "there is no oxygen here, the air pressure is low, the temperature difference is large, and people can't live...... No, it's an ordinary life, and those who have magical element energy may be able to transcend this limitation, such as the Protoss and Demons! ”

I said, "In other words, there is no oxygen in space?" ”

"Is it just oxygen?" Leo said, "Except for the first few in the periodic table, almost all of the rest of the periodic table are gathered around the sun...... Well, the periodic table, I mentioned it in the book "Basic Chemistry and Alchemy", but I didn't remember it myself, plus I'm not sure if there are the same elements in your world, even microscopic particles, and besides, the magic element energy is the biggest bully, because these energies have been proven to exist on the earth, but your world does have these things......"

I stopped my notes and asked him, "How did you feel when you first became aware of these problems?" ”

Leo also paused and said, "Feeling? Well, it's like, I really want to get stronger quickly and figure out these problems......"

I said, "If I were you, I'd probably just go crazy......"

Leo said, "Isn't that just going crazy?" As a rational otaku with a scientific spirit, how can he be controlled by these things? It seems that a scientist once said that if there are really gods and devils, heaven and hell, he will go and see it with his own eyes, broaden his horizons, and by the way, study the gods and demons thoroughly, and see why they don't take human beings seriously! ”

"Is there such a scientist?" I was a little surprised that this was not just blasphemy, but a kind of self-confidence to the point of arrogance, but with some truth.

"I don't remember much, but there must be such a person." "And, in a way, mages are another kind of scientist, especially guys like Santas Mage Tari, who are not bound by secular traditions, even dissecting corpses and taking in orcs, and have the spirit of a scientist who doesn't care about the laws of exploration!" ”

"Santas is just some alien magician, right?" I said, "Of course, I'm kind of an outlier......

"We all are." Leo said, "Okay, hurry up and watch the film, if it was really on Earth, we would have been scolded by other viewers for talking so well......"

The man who landed on the moon planted a flag, collected some dust and rocks from the surface of the moon and went back, and our eyes were closer to the earth, and in the high sky, above the clouds, I saw more cylinder flying objects with symmetrical sails.

"This is an artificial satellite, as the name suggests, it is made by humans, unlike the natural formation of the moon, their function is to monitor the high altitude and the earth, and transmit all kinds of information." Leo said.

I looked at the thousands of satellites that were almost encircling the Earth and said, "Monitor the ground, like Taling?" ”

Leo said: "It's about the same, but the Taling has a small range and high accuracy, and the artificial satellite has a large range and low accuracy, but there are more of them, and the accuracy can also go up ......."

"It seems that the privacy of people on earth is not much guaranteed......" I said.

"At least when you eat, sleep, go to the toilet or do something you don't want to be seen, but you'll be seen." Leo said, "But I can also understand why the people in the mage tower don't treat the tower spirit as a human being, after all, so that they won't have a psychological burden when they go to the toilet, do you remember?" On the first day he came in, Johnny's attitude towards Taling was not very good, I have observed, no one but you treats Taling as a human being. ”

I laughed and said, "That's your plan again......"

Leo also smiled: "If you watch more movies, you will think about them more." Come, continue down, into the atmosphere, is basically the flight limit of all kinds of aircraft, of course, hot air balloons are almost ......"