"In fact, this sequence is the Titius-Bode rule, which was discovered by two German scientists, not only the planets of the solar system have such a law, but most galaxies have similar characteristics, and even the moons orbiting the planets also mostly conform to this law."

After Han Youwei finished explaining the meaning of the sequence, Lang Xiaonian finally made a little addition: "Because of this reason, I always think that in the middle of the orbits of Mars and Jupiter, there was originally a planet, but it was destroyed by external forces. ”

The universe is too vast, and the more human beings want to explore the universe, the more they can feel their own insignificance.

At night.

Several members of the team gathered at Fang Yuan's house, and Lang Xiaonian was also invited to come over for hot pot.

The night sky is starry at night.

Han Youwei held her cheeks, looked at the stars in the sky, and sighed leisurely: "You say, where is the asteroid belt?" ”

Lang Xiaonian continued: "Actually, the asteroid belt can't be seen with the naked eye, and even Ceres, the largest star in the asteroid belt, can't be seen with the naked eye, and the absolute magnitude is too low. ”

"How big is Ceres?" Eve asked.

"Ceres is almost 1/4 the diameter of the Moon, and it is the largest in the asteroid belt. Because the distance is so far, it is not visible to the naked eye. In fact, all the stars we see at night are actually stars. Only when the stars burn and glow can we see with the naked eye. Lang Xiaonian answered.

"You say, do we have a chance to explore the asteroid belt ourselves? If there had been a civilization there, perhaps something would have been left behind. Han Youwei continued to sigh.

"Maybe there's a chance to go to the asteroid belt." Fang Yuan also sighed.

Niu Dazhi had seen the star map of the asteroid belt before, and wondered: "The floating stars and cosmic dust in the asteroid belt are dense, and the spacecraft will not be hit and sunk when it flies over?" ”

Lang Xiaonian shook his head and replied: "Under normal circumstances, it will not be dangerous to drive a spaceship close to the asteroid belt. In fact, according to the estimation of the astronomical community, there are countless stars and rocks in the asteroid belt, and there are definitely more than two million.

"All the stars and rocks orbit the sun, and from the star chart, it seems to be densely packed.

"However, in fact, the density of stars in the asteroid belt is very low, after all, the width of the asteroid belt is more than 200 million kilometers, and on such a wide scale, the probability of hitting a meteorite is very small, less than 1 in 100 million.

"Moreover, the spacecraft has radar and can choose to avoid it, so it is not theoretically dangerous. Of course, if there is an accident and the ship hits any meteorite, something big will happen. ”

Niu Dazhi also began to hold his cheeks and sighed: "You say, will the earth really be smashed by a higher civilization?" ”

"Probably. If we have attracted the attention of a higher civilization. Fang Yuan felt that this possibility was very high.

Moreover, the earth has long been discovered by advanced civilizations.

Since the team learned that there might have been a terrestrial planet in the orbit of the asteroid belt that had been destroyed by an advanced civilization, they suddenly felt a sense of urgency for the survival of civilization.

In the courtyard, only Fang Xiaozhu didn't feel this solemn emotion, and was still playing with Xiong Ba.

……

The next day.

Fang Yuan went to the Advent Civilization Research Building of the Academy of Military Sciences.

The purpose of this trip was naturally to meet "Rahu".

Rahu was still kept in a cylindrical transparent container.

The body in the energy state is usually in a chaotic state, but when Fang Yuan appears, he will merge into a humanoid form.

"You're here? You can't cope with the Star Beast Civilization, are you ready to ask me for help? The tone in which Rahu opened his mouth revealed a kind of arrogance peculiar to high-civilization creatures.

"It seems that your news is indeed very closed, and we don't need you to deal with the Star Beast Civilization." Fang Yuan showed a very calm attitude.

Luo Hu's eyes narrowed slightly, and he guessed: "At this time, it is impossible for you to deal with the Star Beast Civilization. ”

"That's only a matter of time, the Star Beast civilization is nothing more than a bunch of beasts that rely on instinct more than on brains. It's not that difficult to deal with. In fact, the civilization behind you is what human beings should really worry about. Fang Yuan pulled over a chair and sat down and began to chat with him.

Speaking carefully, it's been a long time since I've come to see this uninvited guest of the Palese Soul Descending Civilization.

"You think too much, the civilization behind me, you don't need to worry at all, because you don't have the qualifications to worry at all. If we want, we can even destroy the entire solar system. Are your worries useful? Rahu sneered.

"It's not the first time you've done a galactic strike on the solar system, has it?" Fang Yuan said tentatively.

Luo Hu showed an interested expression and asked, "Want to get information from me?" ”

"Just talking, you should be curious about what's going on out there, right? Don't want to talk to someone? On Earth, I'm probably the only one I'm willing to talk to you. Fang Yuan put on an expression that he didn't really care.

Rahu has been locked up for too long.

This feeling of being locked up in a glass container made him more uncomfortable than killing him.

In the beginning, from time to time, researchers came over to him to ask questions.

Later, gradually there was no one to communicate with him, and this feeling made him very uncomfortable.

Therefore, when he saw Fang Yuan coming in, the urge to speak almost gushed out.

Moreover, he was locked in a container, without the slightest news from the outside world, without knowing what was going on outside, and this feeling of darkness was like being in the endless darkness of the night, trying to open his eyes wide, but seeing nothing.

"It doesn't matter if we talk, what's going on out there?" Although Rahu really wanted to hear a little bit about the outside, he still carried the arrogance of a high civilization, and his tone was still arrogant.

"I can tell you the good news, and maybe the bad news for you, that we have developed controlled nuclear fusion technology. Planetary gravity is no longer a shackle that shackles humanity, and humanity has mastered the power to fly into the universe. Fang Yuan said the biggest thing that happened during this time.

"Controlled nuclear fusion technology, looking at your expression, it seems to be very proud, but to me, it sounds as ridiculous as saying that you have developed a lighter." Rahu scoffed.

Fang Yuan was not affected by his ridicule at all, and said with a smile tugging at the corners of his mouth: "You came to Earth from the Star Beast World through a spatial rift, is it the first time you have come to the solar system?" ”

"Sure, do you think I'm going to run to a barren galaxy many times? It's not that I want to ridicule you, but your galaxy is barren, barren, and barely underdeveloped, like a barren land. Rahu gave a positive answer.

"Have you heard of the solar system before? In the orbit of the asteroid belt, you killed the original terrestrial planet, right? Fang Yuan's eyes revealed a fierce gaze and began to probe.