Chapter 8 the bubble

Theoretical physicist Chen Xingbei made a speech at the 2017 symposium "Commemorating the 110th Anniversary of Shu Xingbei's Birthday" by a junior high school extracurricular physics group in Dalat Banner, Inner Mongolia. (Shu Xingbei, from 1907 to 1983, a famous Chinese physicist in the 1930s. He was extremely talented and was once considered the most likely Chinese to win the Nobel Prize. He resigned from the Massachusetts Institute of Technology in 1931. He returned to work in China after work. However, his wild personality and grotesque behavior were not acceptable to the society at that time. In 1957, he was labeled as a rightist. His life was rough and he failed to achieve epoch-making achievements in academics. This is his personal tragedy as well as the Chinese society. This article The protagonist named "Xingbei" is obviously out of admiration for Shu Xingbei) The speech is an excerpt, which has not been reviewed by me.

Recorder: Battelle (Gazi) The nursery of the Space Technology Institute in Langfang is busy preparing for the experiment.This "baby nursery" does not have babies laughing and crying, nor pacifiers and baby carriages. Its official name is actually "Small-Scale Space Research Institute of China Academy of Space Technology". I thought the name was too awkward, so I gave it this nickname.The director, Chen Xingbei, also readily recognized it and took the lead in using it, so this name has almost become an official name inside and outside the institute, but it is not listed in official documents.

The experimental hall is a dome-style building, the size of a football field, and the center of the hall is very empty, with almost no equipment.Only a small pod hangs in the center of the field, four meters above the ground.It is a single-person cabin, somewhat similar to the recovery capsule of a spaceship, but it is perfectly spherical, and looks as small as a basketball from a distance.Its outer surface is a reflective mirror, which looks crystal clear and beautiful.Standing by the side of the cabin are two little men, who are today's cabin crew, and next to it is a four-meter-high gangway truck.

Today is just a routine experiment. Similar manned experiments have been carried out five times, and unmanned experiments have been carried out 15 times. Everyone is familiar with the road and does not need to direct.So the people below were busy, but Director Chen was very leisurely, standing beside him with his hands behind his back, watching the scenery.His assistant, Xiao Sun, hurried over from the door and said in a low voice: "Director, Dean Qin's car has arrived." Chen Xingbei hummed casually, but did not follow up.Xiao Sun was a little embarrassed and didn't know whether to urge him.Chen Xingbei looked at him, knew what he was thinking, and said angrily, "What? If you fart, let it go."

Xiao Sun smiled and said, "Director, you'd better meet her at the door. After all, she is also our direct superior, with a general on her shoulders, especially our big benefactor." After a while, he added, "You know, she came to inspect this time, probably to decide whether to continue to allocate funds to us." Chen Xingbei didn't care: "Whether or not she will give me the funding doesn't depend on whether I welcome her or not. I don't need to be courteous. Don't forget that in college I was her most admired 'Brother Xingbei', who stuck behind me like a follower all day long." , Just like the sticky little girl now. You asked me to meet her at the gate, can she afford it? Her life was ruined!"

Xiao Sun was in a dilemma.He knew Director Chen's virtues, but the director could talk nonsense, and as the director's secretary, he had to worry about official etiquette.But there was no need for him to make trouble, because Dean Qin Ruoyi, who was dressed in military uniform, had already walked in briskly—and heard all Chen's nonsense.Dean Qin said with a smile: "Don't pick it up, Xiaosun, don't make me lose my life, I want to live a few more years." Xiaosun's face turned red all of a sudden—it was embarrassing for the director.Taking a peek, the embarrassing person looked calm.Dean Qin patted Xiao Sun on the shoulder and comforted him: "Your director is right, I was indeed his follower when I was in college. At that time, I wanted to marry him wholeheartedly, because he often didn't take a bath for several months and I couldn't stand it." ——I'm not exaggerating, as long as he gets obsessed with any problem, he can really go without bathing for several months. Tell me, Xiao Sun, is he still doing this now?"

Xiao Sun also relaxed, and smiled to make fun of him: "It's easy to change the country, but it's hard to change the nature." He left wisely.Chen Xingbei came over to shake hands with Dean Qin, which was a due courtesy.Qin Ruoyi and Chen Xingbei are classmates at Peking University, a year behind him. Although they are academics (Chen studies theoretical physics, Qin studies mechanics), they both love literature. They are the two wings of the "iron triangle" of the Weiming Poetry Club of Peking University Can be regarded as an iron buddy. On the other side of the "Iron Triangle" is Tang Zonghan, the president of the Poetry Club back then, a genius in the Department of International Politics, two years older than Chen Xingbei, and now even a famous figure-the current president of the country.Many important figures in the two administrations came from Peking University, and people said that Tsinghua's feng shui has been transferred to Peking University.

The "Nursery" is actually not a direct descendant of the Space Institute. Five years ago, Chen Xingbei persuaded Dean Qin with his three-inch tongue to establish this institute.It can be said that this establishment is completely "established because of people", because Qin Ruoyi has always believed in the strange talent of this senior.Moreover, although Chen Xingbei is a wild person, usually talking full of guns, but at critical moments, he can also use Su Qin and Zhang Yi's eloquence, "fooling little sister Qin into a daze" (Chen Xingbei's words). The "Nursery" was established five years ago and spent 100 million yuan on the space institute. It has indeed made a breakthrough in theory, but it is still far away from being transformed into practical results.The secretary was right just now. Dean Qin's visit may not be a good omen.

Both Chen and Qin are well aware of this point, but they don't mention it now.Qin Ruoyi said: "Xingbei, you said just now that the little girl is sticky, who is this holy person who can fall into the eyes of the little girl?" She said with a smile, "It's too early, the little girl is only 13 years old." Chen Xingbei pointed to the center of the hall: "Here, Gazi is over there. But don't get it wrong, the girl's stickiness has nothing to do with men and women, they are cousins. Gazi is my nephew, Dalat, Inner Mongolia Banner, Mongolian, formerly named Battelle. He is not very old, he is 15 years old this year, and he will be a first-year student of Tsinghua University when he starts school. This kid is smart and has a strong taste for me. Your sister-in-law said He is like Gazi in the movie "Little Soldier Zhang Ga", the young actor happened to be Mongolian. Gazi later said that this was his nickname in his hometown."

"Dalat Banner is my sister-in-law's hometown. I remember you traveled there four years ago to hold lectures for a junior high school. Is it just for this child?" "Yes, their school's physics extracurricular group is pretty good, and it's unconventional." Qin Ruoyi knew that "unconventional" was the highest evaluation from Chen Xingbei.Chen Xingbei said with a smile: "You know this little girl—a bit clever, good-looking, with eyes above her head on weekdays, but I didn't expect this wild boy from the grasslands of Inner Mongolia to subdue her. "

He yelled towards the center of the field: "Gazi! Xiaoya! Come and meet Aunt Qin!" The two heard it and started running this way.Chen Xingbei said: "The two of them entered the cabin to do experiments today." Qin Ruoyi raised her eyebrows in shock, Chen Xingbei had expected her reaction, and then explained: "It's Gazi who is pestering me to do experiments. I It’s okay to think about it, the most important thing in the experiment is people’s feeling of different phase space, maybe the children’s feeling is more sensitive. Besides, I’m a bit selfish—I want Gazi to participate in advance and take over my class in the future. This kid is a good seed After Xiaoya found out, she insisted on going with her brother Gazi, and I agreed." He said lightly, "You don't have to worry about safety issues, it's just a nanosecond and a distance of 10 meters. And the manned experiment It's been done five times, and I've done it once myself." Qin Ruoyi disapproved of this decision from the bottom of her heart, but she didn't want to interfere with Chen Xingbei's work, so she just said: "As far as I know, it's a very narrow single cabin." "It doesn't matter, these two are short and thin, and together they are not worth an adult." Two people had already run over, and they were indeed both thin and small.The two pairs of dark eyes are particularly energetic.The skin is black and white, and the contrast is strong.Xiaoya wears a camisole, a short skirt, and leather sandals on bare feet; Gazi wears a gray and white cultural shirt with six words on the front: Science PK God, and wide shorts underneath.Qin Ruoyi secretly shook her head in her heart: No matter how they look at them, they don't look like participants of a major scientific experiment.The little girl knew Aunt Qin very well, so she rushed over and grabbed her neck, saying, "Aunt Qin, did you come here to see me for the experiment?" After all, Gazi was born, so he just called Aunt Qin, and stood aside with a smile , but his eyes were not idle, he was staring at Qin's uniform.He must have taken a fancy to the general star on the Dean's shoulders, wishing to have fun wearing it.Qin Ruoyi put her arms around Xiaoya and asked: "The experiment is about to start, are you nervous?" The little girl shook her head with a smile, thought about it and admitted honestly: "It's a little bit." "What about you, Gazi?" "I'm a scorpion, can I still be afraid? The scorpion in the movie is not afraid of the muzzle of Little Japan." "Is there a plan for possible accidents in the experiment?" Gazi said, "Yes, Uncle and Uncle Sun have already talked about it." The little girl said honestly: "Father said, let me listen to Brother Gazi's command." Qin Ruoyi smiled and patted Xiaoya on the back: "Okay, you guys go." The two ran back to the center of the hall, and Xiao Sun followed.It was time, and Xiao Sun helped them climb to the gangway and squeeze into the cabin.After all, it is a single cabin. Although both of them are small in stature, it is quite nervous to sit in it. Gazi only has half of his buttocks sitting on the seat, and Xiaoya basically leans half sideways in Gazi's arms.Before closing the hatch, Xiao Sun carefully repeated the precautions to them, this is the last time: "The radio communicator in the cabin has an effective distance of 5,000 kilometers, which is enough to deal with unexpected situations, so don't worry; the food, water and oxygen in the sealed cabin can maintain survival for seven days; the exhaled carbon dioxide is automatically recovered by the recycler. The cabin is also equipped with The toilet is just under the seat, and urine and urine (and mouthwash) are temporarily stored in a sealed container to avoid polluting the heterogeneous space. "The power propulsion device of the ball cabin can complete the anti-jet deceleration when moving forward and descending, and cannot retreat and turn. However, the fuel (anhydrous hydrazine) is limited and can only be used for three hours. "In case the 're-entry' location of the spherical cabin is relatively remote, don't worry, it has a signal generator for GLONASS (Galileo Global Positioning Device) identification, and the headquarters can keep track of the 're-entry' location at any time. But remember, you have no Wear a space suit, and don’t open the hatch before you’re sure you’re returning to the Earth environment—no one knows what’s going on in the heterogeneous space.” These are actually unnecessary cautions.According to previous experiments, the spherical cabin will appear after one nanosecond, and the displacement distance will not exceed 10 meters.Therefore, the items and equipment in the cabin are actually useless at all.But as an experimental organization, all contingencies must be considered. The little girl listened obediently and kept nodding.From the bottom of her heart, she didn't think there was any danger in this experiment, but Uncle Sun's earnest entrustment of "farewell words" made her feel terrified.Turning to look at Brother Gazi, the muddy boy still had a face full of indifference.Gazi waved to Xiaosun and said: "I've learned these by heart a long time ago. Goodbye, I'm going to close the hatch." He manually closed the cabin door and porthole, and the little Sun outside made a gesture to the command platform, and drove the gangway car away from the center of the venue. The pod hangs alone in the air.There is a 10-meter red line around it directly below it. 10 meters, this red line has become an unbreakable sound barrier, and recent experiments have stagnated at this distance.Just now when Chen Xingbei said "the experiment is very safe", it was actually with a bitter taste - it is very safe because it cannot break through 10 meters.Before this experiment, they improved the technical solution as much as possible, but Chen Xingbei knew that these improvements were minor, and there was little hope of making a major breakthrough by relying on these improvements. When Xiao Sun ran over, Director Chen and Dean Qin were chatting relaxedly. As for whether they were relaxed inside, it was hard to say, after all, it was painful to decide whether to stop the project, and as long as the project was stopped, it meant "nursery" The establishment is also difficult to keep.Dean Qin is saying: "I remember the first space teleportation was only 0.1 mm?" "That's right, I'm not afraid of your jokes. It's a big joke to measure the distance of ultra-dimensional travel with a micrometer." Dean Qin said with a smile: "I don't think it's a joke. The 0.1mm that can be confirmed is also a big breakthrough. And after three experiments, it jumped to 10 meters, an increase of 10,000 times." "It's a pity that it will stagnate in the future." "As long as there is another jump like that, it will increase by 10,000 times, which will be 100 kilometers, which has reached a practical scale." Chen Xingbei paused for a moment.What he said next surprised Xiao Sun. Xiao Sun would never have imagined that the director would actually tell Dean Qin all these details.He thought pessimistically, since Dean Qin heard these words, there is no need to doubt the dismissal of the "nursery".Chen Xingbei said frankly: "Ruoyi, I'm afraid I'm going to disappoint you. To be honest, this technique is very, very difficult. It's not only difficult to increase the moving distance, but even more difficult is the orientation and positioning when re-entering the parent space. Because the latter Not to mention technical solutions, there is not even a minimum theoretical assumption. Let’s put it this way, modern physics is far from reaching this level, to control the trajectory of an object in a heterogeneous universe—in that world, Newton’s laws and the theory of relativity Whether it is applicable or not, we haven’t figured it out yet.” Chen Xingbei looked at her and decided to speak out thoroughly, “Ruoyi, don’t have unrealistic illusions, don’t expect to use this technology for two years during your tenure. Artillery. I'm not saying it can't be successful, but it's probably 1,000 years from now." Qin Ruoyi paused for a moment, tried to slow down her tone and said, "You bastard, that's not what you said when you lobbied me." Chen Xingbei didn't blush at all: "Can you believe everything a man says when he is courting? But after getting married, you have to tell the truth." Qin Ruoyi didn't speak for a long time, and Xiao Sun next to her was so nervous that she didn't dare to speak out.He could feel the tension between the two, and he thought Dean Qin must be very angry, and her anger was completely reasonable.She might be about to speak harshly to Brother Xingbei back then.However, after all, Dean Qin is a high-ranking official, so his self-cultivation is different.After a moment of silence, she lightened the tension with a joke: "Chen, are you saying that you have tricked me into marrying you?" Chen Xingbei also smiled and said, "It's not us getting married, it's the 'Nursery' and the Space Academy getting married—but, today you are here to deliver the divorce papers, right?" "If that's the case, can you understand me?" "I can understand, I understand your difficulties very well. Your difficulties are caused by me. I am the number one bastard in Tianzi. However, please understand me. Although I lied to you at that time, my motive was Bright. I'm not wasting the Chinese people's hard-earned money. Although I had estimated at that time that this research could not be developed into weapon technology, it was still very valuable as a purely theoretical research. But who made our country— ——All countries—emphasize practicality over basic theory, and I can’t get the necessary funds without bluffing and deceiving.” He sighed, “Actually, if you don’t demand too much, the current 10-meter teleportation is already an amazing success , It can be said to be a revolutionary breakthrough in theoretical physics. Ruoyi, please, I hope you can take back the agreement of 'not publishing' at that time, let me announce it to the international scientific community, and earn a Nobel Prize for it. He laughed and said, "It's definitely not a problem to win a Nobel Prize. After I get the prize money, I will donate all of it to the Space Institute, which can be regarded as a refund of a little bit of stolen money." Xiao Sun breathed a sigh of relief, he obviously felt that the atmosphere had eased.And——he admired the director from the bottom of his heart, this Chen Dapao was really eloquent when it came to the critical moment, and the dead could be brought back to life by him.Of course, if you think about it carefully, the reason why his speech is eloquent is because the "core" in it is indeed reasonable.Qin Ruoyi pondered for a while, then smiled and said: "Xiao Sun, are you secretly lamenting your eloquence? But this time he won't be able to fool me so easily." She put away her smile and said seriously, "Let's do some research. It's not my decision to get on the horse, and it's not my decision on where you will go in the future. You must report to the top, maybe you will report to our old classmate." She pointed to the sky with her thumb, In the end, he stabbed Chen Xingbei, "At that time, you can use your eloquence to him, and you will be considered capable if you can fool him. Don't be nervous in front of him, he is still your old classmate." Chen Xingbei immediately climbed up the pole: "I can't wait for this. Ruoyi, please, try to facilitate my meeting with him. You have a general on your shoulders. We are ordinary people. Even though we are old classmates, we would like to meet him." It's not easy." Qin Ruoyi said helplessly: "You, I really dare not touch anything, it's stickier than dog skin plaster." At this time, the last call was made with the cabin crew in the command room, and the voice of the boy who had not changed his voice echoed in the hall: "Everything in the cabin is normal! The crew is ready!" The on-site command announced the countdown to start, and Chen and Qin here also Without talking any more, Xiao Sun handed over two pairs of sunglasses for them to put on. There was no sound in the hall, only the even, unhurried counting sound: "10, 9, 8, 7, 6, 5, 4, 3, 2, 1, light up!" In an instant, the hall was filled with bright lights!The so-called ignition is just following the old habit, and the "lift-off" of the ball cabin (this is also a borrowed term) relies on laser energy instead of chemical combustion agents.Following the ignition command, tens of thousands of powerful X-ray lasers distributed on the dome-shaped inner wall of the hall were simultaneously activated, and tens of thousands of beams were shot at the ball cabin in the center of the hall, forming an extremely dazzling light ball in the ball cabin in an instant. Like a miniature supernova erupting in front of people's eyes.These laser beams are precisely calibrated and focused into a net outside the capsule, like a protective net covering the capsule.This net is very close to the ball cabin, only 30 mm, this is to minimize the volume of the "small space to be moved", because the volume is exponentially related to the required energy, and a small increase in volume will increase the required energy Tens of thousands of times.Just because of this, the ball cabin is also designed to be as small and simple as possible. The focused high-energy laser is enough to vaporize all matter in the universe, but the spherical cabin surrounded by the laser net is not dangerous, because when a large amount of light energy is poured into this small-scale space, the energy density of this space is as high as 1037 joules per cubic centimeter, As a result, extreme distortion is caused, and it bursts out of the original space (or mother universe) within one nanosecond, and the energy of the laser has no time to act on the cabin. The ball of light is extremely dazzling, making the hall "white blind".But Chen Xingbei understood everything that happened, like watching a slow-motion movie.The optical net cut off the sling on the ball cabin in an instant, but the ball cabin had no time to fall, and it would fall out of the mother universe along with the small space (scientifically called sub universe or baby universe).The small space is unstable, and it will reintegrate into the mother universe when it bursts out, but it is no longer at the original starting point.The distance between two points is the "throwing distance" that Qin Ruoyi is most concerned about. In other words, this method can be used to drop a nuclear bomb on an enemy country, and NMD is useless to it at all, because its trajectory is not even within this universe. Unfortunately, it can only reach a distance of 10 meters at present. The duration of the laser light is only a few microseconds, but due to the phenomenon of human persistence of vision, it seems to last for a long time.Now, the laser was off, and everyone in the hall took off their sunglasses and focused their eyes on the area within the 10-meter red circle.And then - nearly a hundred people simultaneously said "Hey!"Unlike previous experiments, there is nothing in that area today.Then, all the heads turned around, looking for the ball cabin in the hall, but they couldn't find it either.Chen Xingbei reacted extremely quickly, without delaying a moment, left Qin Ruoyi behind, and strode towards the command room.The on-site commander is Liu Zhiming, the deputy director, who has already started the scheduled procedure. First, he communicated with the cabin crew through the intercom: "Gazi, Xiaoya, please answer if you hear it! Please answer it if you hear it!" There was a suffocating silence. After Chen Xingbei came in, Commander Liu pointed to the global positioning display screen. There used to be a small red dot that was always on, indicating the position of the ball cabin, but now it disappeared—it didn’t move 10 meters as usual , nor did it move hundreds of kilometers as people hoped, but simply disappeared.Chen Xingbei took the microphone from Commander Liu, and shouted a few more times, but the other party remained silent.Commander Liu looked at the director, who nodded: "Mobilize the plane." Commander Liu immediately issued a notice to the Beijing Garrison, asking them to send helicopters to search according to the plan.The other side immediately replied, saying that two Z-8Fs had already taken off and would search the area within a radius of 100 kilometers near the "Small-scale Space Research Institute".This is the first step. If the search fails, additional troops will be deployed to expand the search area.Qin Ruoyi also came in, and the three of them exchanged glances silently without anyone speaking first.After a while, Chen Xingbei said calmly: "Searching is useless. The communicator and GLONASS positioning device in the ball cabin will never fail at the same time. There is only one possibility: the little bubble we stimulated has not burst, and it has remained in a condensed state until now. That is Another universe, a universe that is isolated from us, cannot have any information channel with this side. Ruoyi, we have succeeded. The continuous condensation time of this order of magnitude is enough to throw the ball capsule anywhere on the earth, even outside the galaxy. It’s just—Gazi and Xiaoya are trapped in that bubble.” His voice was calm, but his gaze was extremely complicated.Qin Ruoyi understands his joy (as a scientist) and his pain (as a father and uncle), she can't comfort her, she can only say: "If it comes, it will be safe. It's useless to be anxious. Let's discuss the solution carefully, come on." Chen Xingbei is right, the search is futile, you can't go to the outer universe by flying straight to 8F.It is impossible to come up with any solution through their discussion, which is actually consistent with what Chen Xingbei said earlier that "theoretically, the throwing orientation cannot be guaranteed": modern physics is far from reaching this level, and it is possible to monitor or interfere with the outer universe The trajectory of an object's motion.Even so, the helicopter searched for two days and expanded the scope to a radius of 1,000 kilometers (and then extended to North Korea and Japan), but found nothing.The communicator and GLONASS signal in the ball cabin have remained silent.Three days later, Chen Xingbei informed him to stop the search. He said that there was no need to do any more useless work, and the only thing to do now was to wait for the bubble to burst on its own. Chen Xingbei originally wanted to hide it from his wife Wu Ri Geng Dalai, who lives in Beijing, but it was impossible. A mother seems to have a natural intuition and can sense the danger of her daughter (and natal nephew), even if they are outside the universe.From the second day of the experiment, she called frequently to ask about the safety of the two children. No matter how her husband explained the coaxing, she only held a scripture: she didn't hear the answers from the two children, so she just didn't believe it.On the third day, she drove to Langfang without informing her husband. Qin Ruoyi accompanied Xingbei to meet his wife. These days, Qin Ruoyi has not left here. Although it can't help, at least it is psychological comfort.After confirming the disaster of his daughter and nephew, Uri Gendarai swayed and almost fell down.She pushed away her husband who had reached out to support her, and said anxiously: "Hurry up and look for them, they will be searched in the sky and on the ground, even if they are buried 1,000 meters underground, they will have to be dug out!" Chen Xingbei could only smile wryly.Of course, the wife has known her husband's research direction for a long time, but this woman is born with a lack of spatial imagination, and has never really understood the meaning of "space bubble".Even if she tried her best to use her imagination, she could at most imagine it as a spirit monster that could roam freely in the sky, underground, on the earth, and outside the earth.In a word, her imagination cannot escape "this" three-dimensional world. Qin Ruoyi tried her best to comfort the devastated mother.She had a job and couldn't stay in Langfang for long, so she had to go back to Beijing, leaving Chen Xingbei and his wife (and the whole staff) waiting anxiously. Time passed day by day, and these days, Uri Gengdalai was almost out of water.In fact, Chen Xingbei was more anxious than his wife, because his wife didn't know the deadline: seven days.There is only enough water, food and oxygen in the spherical cabin for seven days.Of course, the time for water and food is flexible, and you can persist without water or food for a few days.But oxygen is not good, and the tolerance of oxygen is very limited. No matter how economically it is used, it will not last for eight days.If the cosmic bubble can persist for eight days without bursting—this is a great victory of human wisdom, and even God will be jealous. Although he claims to be omnipotent, he can only take care of the affairs of the universe.But God's revenge is too cruel - this victory will sacrifice two young lives. Seven days will pass soon, and this period of time is so long. During these seven days, God has created the whole world.But the seven days seemed so short, and people counted the remaining lives of the two children second by second.On the eighth day, the sun rose again, and it was still a beautiful day with colorful clouds and a bright and clear sky.Nature still shows its enchantment, and doesn't care about a little sadness in the world.Chen Xingbei came to the command post and changed to the deputy director's shift. These days, they have been taking turns on duty, insisting on 24-hour monitoring.But on the morning of the eighth day, they could be said to be desperate.At this moment, the voices of two children suddenly came from the intercom: "It's open! It's open! Little girl, look, it's open!" "Brother Gazi, the bubble is open!" The voice was exceptionally clear and cheerful.Its appearance was too sudden, without any warning, and it didn't sound like returning from the out-of-phase world at all.The two directors were stunned for a moment, Chen Xingbei immediately leaned over and asked eagerly: "Gazi, Xiaoya, is it you? Please answer if you hear it!" "It's us, Uncle! The bubble suddenly opened, and we can see the sky, the sun and the clouds outside!" Chen Xingbei turned his head and said, "Zhiming, hurry up and notify the little girl that they are safe! You should also notify Ruoyi!" Turning around, he said to the intercom, "Hey, where are you? Where? I'll send a helicopter to pick you up immediately!" "Where are we? Anyway, it's on Earth (Chen Xingbei laughed in his heart, this bastard, he can't forget his slob at this moment), let us see. Ah!" Their voices suddenly changed, and you said I shouted in horror, "Dad, uncle, we are on the battlefield! The shell exploded not far away (there was a clear explosion sound from the communicator)! There are also tanks and planes!" Chen and Liu were also stunned. Misfortunes never come singly. They escaped from the closed universe bubble, but they happened to fall onto the battlefield!The existing battlefield is of course abroad. They are running through the world map in their minds quickly, speculating where there is war in the world today, and it will not be a guerrilla war like Iraq, but a regular war using aircraft and tanks.Before they could figure it out, they spoke again: "Don't panic, girl, don't panic, I don't think it's a war, it's a drill! That's right, uncle, it's a drill! All the tracer bullets flying in the sky are not live bullets." The voice paused for a while, "Uncle, I think it looks like a little Japanese There is a tank in front that looks like a Japanese Type 90, and the plane in the sky looks like a Japanese PX anti-submarine plane, that’s right, that’s it, with a large disc radar antenna on the back of the fuselage, and a Japanese red flag on the side. Plaster. Uncle, I know, we must be in Okinawa right now!" Chen Xingbei fully approved Gazi's judgment. Gazi is a military fan, and the weapons of various countries are rare. He judged that the weapons were Japanese weapons, and he was right.Moreover, Chen Xingbei immediately recalled that Japan had announced earlier that it would conduct an island-seizing military exercise on Okinawa today (July 13, 2021), obviously with China as its imaginary enemy.Half a month ago, Gazi had said some extreme things about this news.So, this ball cabin must have gone to Okinawa, Japan. Chen Xingbei and the deputy director smiled wryly at each other.It is a great news that the two children are safe.However, the ball cabin flew to Japan and happened to land on the battlefield of a military exercise. It seemed that a considerable diplomatic trouble could not be avoided.He had to notify Qin Ruoyi and the Ministry of Foreign Affairs immediately so that they could make preparations.At this time, Xiao Ya's scream came from over there: "Father, the Japanese soldiers found us! There are more than a dozen running this way!" Changing to Gazi's voice: "Damn it's unlucky, the war hasn't started yet, Gazi has to be a prisoner of Little Japan first!" Chen Xingbei immediately expected that the call between them would be cut off soon, so he hurriedly shouted: "Garrah! Little girl! Pay attention to the occasion and don't talk nonsense!" He asked Gazi to pay attention to diplomatic etiquette, but Gazi obviously misunderstood it: "Uncle, don't worry, we will be as steadfast and unyielding as the little soldier Zhang Ga, and the devil will not even try to ask anything!" He said nervously, "They have already arrived Yes! Shout out to us! Goodbye!" There was a chirping noise in the intercom, and then there was no sound. It must have been damaged by the squat. More than a dozen Japanese marines approached the strange thing cautiously under the command of Major Abe.They were very nervous, with muzzles and flamethrowers aimed at the thing.It was a round spherical body, not big, with a diameter of more than one meter. It was aluminum-plated and gleaming, lying on a mountain bag.It was so strange that it appeared out of nowhere.How did it come about?There is a broken steel rope end above the sphere, and from this point of view, it seems that it was hoisted by an airplane, and the steel rope broke, so it fell here.But how can they escape the radar on the battlefield?Even in the best stealth aircraft, the pod alone would be enough to be scanned by radar, and its aluminum surface must be an excellent radar reflector.What's more, there are hundreds of pairs of soldiers' eyes on the scene. Maybe this is the alien flying saucer in science fiction?There is a row of very narrow portholes around the upper half of the ball cabin. The glass is coated, so you can't see the inside clearly, but you can vaguely see that there are living things inside. (A living alien?) But after getting closer, Major Abe knew that this thing must have nothing to do with aliens. It might be the spy equipment of the neighboring country to the west, because there are some Chinese characters on the portholes. symbol.Abe does not know Chinese, but all Japanese can recognize Chinese characters.No, those are not Chinese characters, but the mirror image of Chinese characters, that is to say, those characters are upright when viewed from the window, but reversed when viewed from the window.Abe tried his best to do a mirror image inversion in his head, and recognized the words: Bubble No. 6. Needless to say, the appearance of this ball cabin must be related to the ongoing military exercise, and it was sent by the Chinese army to collect intelligence.But Abe's intuition is also questioning this conclusion. This kind of espionage operation is too "blatant". It landed on the battlefield in broad daylight, with Chinese characters written on the cabin, as if it was afraid that others would not recognize its owner! He reported the discovery here to his superiors, who said they would send someone to deal with it immediately.At this moment, he commanded his men to surround the ball cabin and shouted in Japanese to let the people in the ball cabin come out.Guessing that the people inside might not understand Japanese, he yelled in English several times. Through the porthole, I saw movement inside, and then there was a slight sound of the door lock turning, a small cabin door slowly opened, and the muzzles of a dozen guns outside were aimed at it immediately, the door finally opened, and a person came out from inside. A pretty girl!Fair skin, flexible eyes, a camisole, a miniskirt, and two beautiful bare legs.Her beauty, especially her unusually bright smile, dazzled the eyes of the surrounding soldiers.A kid came out right behind her, with a nonchalant ghostly smile on his face, and a few Chinese characters printed on his jacket.Gazi just destroyed the communicator before he came out. If there were 38 big covers in the cabin and made by Hanyang, he would definitely smash them all.However, this spherical cabin is too simple, there are not many devices worth destroying, and it is obviously too late to destroy the cabin itself. The two left the ball cabin with a smile, and stood on the hill, looking down at the soldiers with guns facing each other.Abe approached the ball cabin suspiciously and stuck his head inside to have a look.The inside is too simple, there are almost no instruments, there is only one driver's seat—two occupants are squeezed into one chair? !These circumstances made him even more suspicious. It was too unlike an espionage operation. He walked over and looked at the two trespassers again.From an ethnographic point of view, they are no different from Japanese boys and girls, and if they are squeezed into the crowds of Tokyo, no one can tell that they are foreigners.But at this moment, under this specific environment, Abe immediately identified them as Chinese. There were many inexplicable things in their eyes, and a deep invisible gap was drawn between the two sides.Abe signaled the soldiers to lower their guns, put the pistols into the holsters, and asked each other in turn in Japanese and English: "Who are you? What are you doing here?" Gazi's English is very good, Xiaoya's English is not so good, but I have learned some Japanese from my father, so simple conversation is not a problem.However, the two had agreed before leaving the cabin that they would pretend not to know any foreign languages.Gazi smiled and ordered: “找个会说人话的来，我听不懂你们的鸟语！知道吗？你的话，我的不懂！” 小丫又摇手又摇头：“不懂！不懂！” 陆战队的士兵们训练有素，很快用一顶军用帐篷遮盖住这个球舱，并在周围拉上警戒线。这玩意儿太异常，自卫军的专家们要仔细研究。在这之前，不能让新闻界得到风声。 嘎子和小丫被安倍少佐和一个士兵押上直升机，送到另外一个地方，这儿好像是兵营，因为屋外有军人来往，但接待（应该说是审讯）他们的两人则身着便装。高个子叫渡边胜男，笑容可亲，北京话说得比嘎子还顺溜；矮个子叫西泽明训，面无表情，基本上不怎么说话。嘎子和小丫进来时，渡边先生像对待大人物一样迎到门口，毕恭毕敬地垂手而立，说： “欢迎二位来到日本。”他笑着补充，“尽管你们来的方法不大合法。” 嘎子信奉的是“人敬一尺，我敬一丈”，也忙鞠躬还礼：“谢谢，谢谢。对不起，给您添麻烦了！” 小丫看着他不伦不类的日式礼节，捂住嘴没有笑出声。 渡边请二人坐下，奉上清茶。然后问：“二位能否告诉我你们的姓名？” “当然。我叫张嘎子，是中国内蒙古人。她叫陈小丫，北京人，是我的表妹。” “你们是怎么来到冲绳的，又是为了什么而来？请如实相告。” “我也正糊涂着哩！”嘎子喊道，“那天我们是在内蒙古达拉特旗的恩格贝——知道这个地方吗？贵国的远山正瑛先生曾在那儿种树治沙，他是我最崇敬的日本人。” “我们知道。我们也很崇敬他，他是日本有名的'治沙之父'。请往下讲。” “是这样的，小丫放暑假，到我家玩。我们那天正在恩格贝西边的沙山上玩滑沙，忽然天上不声不响地飞来一个白亮亮的球，一直飞到我俩头顶。我小丫妹指着那玩意儿尖叫：嘎子哥你看，外星人的飞碟！就在这时，一道绿光射下来把俺俩罩住，我们就啥都不知道了。一直到这架飞碟刚才坠落时，我们才醒过来。” “你说是外星人绑架？” “是的，肯定是的！小丫你说是不是？” 小丫鸡啄米似地点头：“是的是的，一定是外星人干的！” “噢，被外星人绑架——那一定是一段非常奇特的经历。” 这句话挠到了嘎子的痒处，他不由得两眼放光。那七天在外宇宙的奇特经历！那个超圆体的袖珍小宇宙！地球上古往今来只有他和小丫体验过！他现在急于见舅舅，叙说这段难忘的经历，但非常可惜也非常败兴，他们从外宇宙凯旋，却不得不先同日本特务打交道（这两人必定是日本情报机关的）。嘎子只好强压下自己的倾诉欲，继续与审讯者胡搅。 渡边先生笑着说：“外星人也使用汉字？我见球舱上写着泡泡6号。” “那有啥奇怪的，外星人的科技比咱高多啦。别说汉字，什么片假名、梵文、甲骨文、希伯来文、楔形文，没有不会的！小丫你说是不？” “当然啦，当然啦。” 渡边微笑着点头：“对，有道理。而且他们说中国话也很不错。请听。” 渡边从口袋里掏出一架袖珍录音机，按了播放键。那是嘎子、小丫同小丫爸的通话，从“舅舅，泡泡突然打开了”一直到“俺俩一定像小兵张嘎那样坚贞不屈，鬼子什么也别想问出来”，听完这段话，嘎子和小丫互相看看。小丫因为两人的信口开河被揭穿多少有点难为情，嘎子一点也不在乎——反正他说刚才那篇鬼话时，压根儿就没打算让对方相信。现在谎话揭穿了，反倒不必费口舌了。嘎子抱着膀子，笑眯眯地看着审讯者，不再说话，等着看“鬼子”往下使什么花招。 毕竟时代进步了，往下既没有辣椒水也没有老虎凳。而且，渡边竟然轻易地放过这个话题，和他们扯起闲话来。问他们知道不知道日本有什么好玩的地方，还说：“不管你们是怎样来的，既然来了便是贵客，如果想去哪儿玩一玩，尽管吩咐。”嘎子和小丫当然不会上“糖衣炮弹”的当，客气地拒绝了。渡边突然想起来： “你刚才不是说非常崇敬远山正瑛先生吗？我可以安排你到他家采访。据我所知，他的重孙女还住在北海道的鸟取县。” 嘎子犹豫了。这个提议相当有诱惑力。作为达拉特旗的牧民儿子，他确实非常崇敬远山老人，老人自愿到异国他乡种树治沙，一直干到97岁，死后还把骨灰葬于沙漠。嘎子很想见见远山老人的后人，代表乡亲们表示一下感激之情。而且，说到底，到那儿去一下又有什么害处？渡边在这儿问不出来的情报，到那儿照样得不到。 小丫用目光向他警告：别上当，他们肯定是玩什么花招。嘎子朝她挤挤眼，高兴地对渡边说： “我们很乐意去，请你们安排吧。承蒙关照，谢谢！” 然后又是一个日本式的90度鞠躬。 东京大学的坂本教授接到电话预约，说请他在办公室里等候，内阁情报调查室的渡边先生和统合幕僚监部（日本自卫军总参谋部）的西泽先生很快就要来访问。坂本心中有些奇怪，不知道他们所为何来。他在学校里属于那种“默默搞研究”的人，研究领域比较偏，比较窄，专攻大质量天体所引起的空间弯曲。按照相对论，行星绕恒星的运动既可以描述为“平直时空中引力作用下的圆锥曲线运动”，也可描述为“按弯曲黎曼空间的短程线行走的自由运动”，两种描述是完全等价的，但前者在数学上更容易处理一些。所以，坂本先生对黎曼空间的研究更多是纯理论性的。如今他已经60岁，马上要退休了。情报和军方人员找他会有什么事？ 渡边先生和西泽先生很快来了。渡边说：“对不起，打扰了，我们有一件关系到国家利益的重要事务要向您请教。”他详细讲述了那个“凭空出现”的闪亮球体，及对两名少年乘员的问讯。又让坂本先生看了有关照片、录音和录像。He said: “毫无疑问，我们的大邻国在空间运送技术上有了革命性的突破，可惜，我们咨询了很多专家，他们都猜测不到这究竟是什么突破，连一点儿设想都没有。至于他们为什么把这个球舱送到冲绳，有不同看法，比如我和西泽先生的看法就不同。西泽君，请你先说。” 西泽严厉地说：“我认为，这是针对我自卫军的夺岛军演，对方所做的赤裸裸的恐吓。球舱里坐了一个似乎无害的小男孩，但我想这是有隐喻的——想想广岛原子弹的名字吧（美国扔在广岛的原子弹的名字叫小男孩）。” 渡边笑着反驳：“那么，那个小女孩又是什么隐喻？死亡女巫？”他转向坂本说：“按我的看法，对方的这种新技术肯定还不成熟，这个球舱飞到冲绳只是实验中的失误。但不管怎样，有两点是肯定的：第一，中国军队肯定开发了或正在开发某种革命性的投掷技术。第二，这个球舱对我们非常有价值，简直是天照大神送来的礼物，必须深入研究。” 坂本稍带困惑地说：“我个人比较认同渡边先生的意见。但你们为什么找我？这并不属于我的研究领域。” “坂本先生，你刚才听了两个孩子同某个大人的谈话录音。我们对那人的声纹，同我们掌握的中国高级科研人员的声音资料作了比对，确认他是中国空间技术研究院的陈星北研究员。据我们的资料，此人在16年前，即2005年，曾来我国参加了爱因斯坦百年诞辰学术讨论会，与你有过接触。” 坂本回忆片刻，想了起来：“对，当时是一个25岁左右的青年，小个子，日语说得非常流利。嗯，等等，我这儿好像有与他的合影照。” 他匆匆打开电脑，搜索一会儿，找到了：“你们看，就是这个人。” 照片是四人合影，最旁边的是一个瘦削的小个子，外貌看起来毫不起眼。坂本说：“他当时好像刚刚读完硕士，那次开会期间，他曾和我很深入地讨论过黎曼空间。让我印象较深的是，他专注于'非引力能'所造成的空间极度翘曲。噢，等一下！” 他突然有了一个电光火石般的灵感，觉得自己已经找到了解开这个难题的钥匙：“嗯，我有了一个想法，但这个想法过于大胆，甚至可以说是疯狂，目前我还不敢确认。渡边先生，我想尽快见到球舱中那两个孩子，哪怕从他们那儿得到只言片语，都可以帮助我确认这个想法。” 渡边摇摇头：“那两个孩子，尤其是男孩，是极端的民族主义者，在他们那儿你什么也问不到的。不过我已经安排人带他们到鸟取县，去拜访'治沙之父'远山正瑛的重孙女。”他笑着说，“那男孩对远山老人十分崇敬，也许在那儿，他时刻绷紧的警惕性会略微放松一点儿。我的一位女同事已经提前赶到那儿等他们。我们最好现在就赶过去。” “你是说——让你的女同事冒充远山老人的后代？” 渡边从教授的目光里看到了不赞成的神色，便略带尴尬地承认：“没错。这种做法确实不大光明，但事关日本国的重大利益，我们不得不为之。其实我派人冒充是为远山家人好，不想让他们牵扯到这种肮脏事中。至于我们——我们的职业就是干这种事的。没办法，每个国家都得有人去做类似的肮脏事，有些人做厨师，也得有人打扫便池。” 西泽不满地看看他，尖刻地说：“我看渡边君过于高尚了。这算不上什么肮脏事，你不妨比较一下那种可怕的前景：我们花巨资打造的NMD在一夜之间成了废物，一颗'小男孩'突然在东京上空爆炸。” 渡边平静地说：“西泽君似乎过于偏激了一点，情绪战胜了理性，这是情报工作者的大忌。”他事先截断西泽的话，“好了好了，我们暂时搁置这些争议，反正咱们眼前的目的是一样的，就是赶紧挖出那个球舱的秘密。对不，坂本先生？” 坂本没说话，只是点点头。他打心底里厌恶类似的“政治中必不可免的肮脏”，但作为日本人，他当然会尽力挖出这个奇异球舱的秘密。“好吧，我和你们一块儿去，我会尽力弄清它。” 球舱到日本两天了，奇怪的是，日本方面没有任何动静，没有外交交涉，没有递抗议，没有相关的新闻报道。这天，秦若怡亲自通知陈星北到空间院开会。she says: “星北我可是尽心了，下边就看你招摇撞骗的本事了。好好准备，来一次最雄辩的讲演。” 陈星北匆匆赶去。这是个小型会议，与会的只有十人，但都是说话管用的各方“诸侯”，除了若怡，还有总参、总后、国防科委、航天部、二炮、科学院理论物理研究所，以及外交部。人到齐了，人们都闲聊着，似乎在等一个人。当最后一位走进会议室时，陈星北大吃一惊，下意识地站起来，先把目光转到若怡身上——这会儿他才知道若怡说的“我尽心了”的分量。来人是国家主席，他的北大同学，诗社社长，若怡真把他也拉来了！若怡眸子中闪过一丝笑意，分明是说：紧张了不是？别紧张，把他骗倒才是你的本事。 唐主席同各位握手问候，眼睛在找陈星北。他走过来，同星北大幅握手，笑着说： “老同学，你可是捅了个不小的娄子，真是本性难移呀。” 陈星北笑着说：“麻烦与荣誉并存。” 开会了，唐主席简短地讲了两句：“若怡院长极力向我推荐陈星北这个捅了麻烦的，又根本没有成功把握的项目。今天就请小陈把我们说服。”他扭过脸对陈说，“讲解时尽量直观浅显。在座的都是专家，但隔行如隔山，比如说，我就弄不清你那个宇宙泡到底是什么玩意儿。你把我们当成小学生就行。” 陈星北拿上激光笔，精神抖擞地走上讲台。下边的秦若怡调侃地想：这家伙精神头还行，看来今天没有紧张。陈星北说： “首先请大家不要把空间泡或宇宙泡看得多么神秘。物理学家早就能随意吹出微观的小泡泡，即在真空中注入能量，完成所谓的'海森伯能量借贷'，把真空中凭空出现的虚粒子升格为实粒子，这些粒子的实质就是空间泡。还有我们的宇宙，爱因斯坦说它是个超圆体，直观地说就是个超级大泡泡。黑洞也是一种泡，是向内凹陷的泡。而我所研究的则是一种中等尺度的正曲率空间泡。下边我来做一个演示。” 他拿过一根一米多长的细丝，上面间断涂着赤橙黄绿青蓝紫几种颜色。他把细丝弯成一个圆，接口处马上自然黏合了： “这是一种高弹性兼高塑性的特殊材料，我们把它看成一维的封闭空间，或者说是一维的超圆体，它有限，但无边界。假设有个一维人沿圆周爬，永远找不到天尽头，但也不会掉到'无限'中去。现在我用外加能量的办法，让这个一维空间局部畸变。” 他在红颜色处用指头向里顶，大圆局部凹陷，形成中文的“凹”字。他继续用力，直到大圆的缺口两端互相接近，接合，接合处随即黏合住了，这会儿细丝变成了相套的两个圆。他把这个双重圆放到讲台上（投影仪把图像投到了屏幕上），把接触处沿法线方向拉长，再用剪刀把它剪断，小圆便脱离了大圆。 “请看，一维宇宙因局部畸变能够生出一维的封闭泡泡，并脱离了母宇宙。刚才我们假设的那个一维人这时一定正奇怪着，为什么世界上的红色区域忽然凭空消失了？还请记住，这个子泡泡虽然脱离了母宇宙，但在比它高一维的二维世界里，子泡泡是被母宇宙所圈闭，无法逃逸出去的。” 他用手在桌面上移动子泡泡，让它不时地触碰大圆，碰一下，又返回去。 “现在，子泡泡要与母泡泡重新融合了。” 他把小圆按紧在大圆的绿色部分，使接触处黏合，再把接触区域沿切线拉扁，用剪刀沿法线方向剪开。现在，大小圆又恢复成了中文的“凹字”，陈星北一松手，下凹部分就因弹性自动张紧，使大圆恢复成完美的圆形，不同的是现在颜色次序有了变化，绿色区域中夹着一段红色。 “好，子泡泡重新融入母宇宙了，但在一维人的眼里，它却是从红色区域'凭空'消失，又'凭空'出现在绿色区域。也就是说，这个过程是在它们的维度宇宙之外完成的。至于泡泡重入点与消失点之间的距离，就是若怡院长念念不忘的'投掷距离'。” 他对秦若怡笑笑，像是对她的微嘲。然后向听众扫视一遍，问：“我讲的这部分，是否有没说明白的地方？” 大家都听得很专心，唐主席点点头：“很清楚。请继续。” “现在，我们把一维宇宙升格为二维。”他取过一个圆气球，用食指顶某处，使其向里凹陷，“遵循同样的过程，也可吹出二维的泡泡。但这个过程用手演示有困难，我们看电脑动画吧。” 屏幕上显示出一个气球，上面印着各种颜色。然后红色区域的球面向里凹陷，凹陷加深，直到球面缺口处接触，黏合，凹陷部分脱离，变成大气球中套着的一个小气球。小气球在大球中飘浮，不时与大圆相碰后再飘开。一直等它飘到绿色区域时，与大球接触并黏合，黏合处开始变形，沿法线方向出现空洞，变成球形的“凹”字，然后凹陷处因弹性自动张紧，使球面恢复成完美的球形。只是颜色次序有了变化，绿区中嵌着一块近似圆形的、四周带着放射性缺口的红色区域。 “好，二维世界的球舱已经从廊坊飞到冲绳了，二维生物们一定正进行外交上的交涉。其实呢，'红国'并没有侵犯'绿国'的领空，这片区域的投送是在二维世界之外完成的。” 听众中有轻微的笑声，大家都听懂了这个机智的比喻。陈星北目光炯炯地看着大家： “上面的过程都很直观，很好理解，但把它再升格到三维宇宙，就很难想象了：三维宇宙中吹出的三维泡泡，怎么能在三维世界之外而又在它的圈闭之中？确实难以想象。这并不奇怪，人类是三维空间的生物，我们的大脑就是为三维世界而进化的，所以无法直观地想象更高维世界的景象。但不要紧，人类的逻辑思维能力是上帝的恩赐，依靠它，我们能把想象扩展到高维世界中。现在，用数学归纳法总结从一维到二维的过程，很容易就能推延到三维，得出以下结论。”他补充一句，“其实这些结论在更高维度中也是正确的，不过今天我们只说三维宇宙。” 他喝了一口水，扳着指头，缓缓说出四个结论： “1.我们所处的三维宇宙是个超圆体，因为引力而自我封闭，有限，但无边界。 “2.三维空间会因引力或其他外加力量而产生局部畸变，如果畸变足够强，就能自我封闭，形成超圆体三维子宇宙。 “3.子宇宙将与母宇宙互相隔离，但在更高一维即四维世界中，子宇宙被母宇宙所圈闭。 “4.子宇宙在飘移中有可能与母宇宙重新融合。 “然后，突然消失的三维空间（连同其中的三维物体）又会在母空间的某处凭空出现，既无过程又无痕迹。这就是我们说的超三维旅行。”说完，把激光笔插到口袋中，暂时结束了这段讲解。 会议室很静，大家都在努力消化他说的内容。唐主席面色平静，手里轻轻转动着一支铅笔。陈星北知道这是他的习惯动作，在大学里，他苦思佳句时就是个动作。等了一会儿，唐主席笑着问： “恐怕与会人中我是唯一的外行，所以我不怕问两个幼稚的问题。第一，你讲了泡泡向内变形，被母宇宙所圈闭。但它们同样可以向外变形啊。” “对，没错。不过，在拓扑学中，这种内外是可以互换的，本质上没有区别。” “噢。第二个问题，你说子泡泡可以重新融入母宇宙，在三维宇宙中，它可能在任何地方重入。那么，为什么它只能在地球表面出现，而我们不担心它会——比如说，出现在地核里呢。那样的话，两个孩子可是绝对没救了。” 陈星北赞赏地说：“这不是幼稚问题，提出这个问题，说明你真正弄明白了'三维之外的泡泡'的含义。你说得对，子泡泡可以在任何地方重入，包括地核中。但是——还是以两维球面作比喻吧，我刚才说的是光滑球面，宏观弯曲而微观平坦；但实际上，由于重力不均匀，在微观上也是凸凹不平的，就像是桃核的表面。大质量物体，像地球，会在附近空间中造出明显的凹陷，当子泡泡在母宇宙中出现时，当然最容易落到这些凹陷里，也就是落在地球和空间相接的地表。”他抱歉地说，“这只是粗浅的比喻，真正讲清要有比较艰涩的知识。” “好，我没有问题了。” 等了一会儿，陈星北说： “还应补充一点，宇宙泡泡有两种。一种是因内力（包括弱力、强力、电磁力和引力）而封闭的空间泡，它们是稳定的，称为'内禀稳定'，像我前面提到的各种粒子、宇宙大泡泡及负曲率的黑洞，都是如此。另一种是因外力而封闭的空间泡，称为'内禀不稳定'，比如我们用注入激光能而封闭的中尺度空间泡，在形成的瞬间就会破裂。但最近这次实验中已经有突破，保持了泡泡七天的凝聚态。这个时间足以把球舱投掷到银河系外了。但非常可惜，至今我们不清楚这次成功的原因，此次实验前我们确实在技术上做了一些改进，但以我的直觉，这些改进不足以造成这样大的飞跃。我们正在努力寻求解释。”他笑着说，“甚至有人提出，这次之所以成功，是因为舱内有一男一女，按照中国古代学说，阴阳合一才能形成天地。” 二炮的章司令微嘲道：“好嘛，很好的理论，可以命名为'太极理论'，多像一个三维的太极图：圆泡泡内包着黑白阴阳。你打算花多少钱来验证它呢？” 陈星北冷冷地顶回去：“我本人绝不相信这些似是而非的理论，但我确实打算在某次实验中顺便地证伪它，或证实它。要知道，我们研究的问题本来就是超常规的，也需要超出常规的思维方式。” 秦若怡机敏地把话题岔开：“请讲解人注意，你一直没有涉及最大的技术难点：如何使超维度投掷能