In the dark, icy corners of the solar system, the blue planet is forever bright in the darkness of space, and its only natural satellite slowly and endlessly revolves around the blue planet while they orbit the distant sun together.

They are so small relative to the star that gives them sunlight that it would be really hard to spot them if it weren't for the reflection of sunlight. In this way, the blue planet and its moons have been orbiting the sun for more than 4 billion years, silently and tirelessly.

In the darkness of space, that leaf lurks like a ghost above a satellite. In the eyes of the people living in the leaf space station, this spaceship is as big as the eye can see.

On the Leaf Space Station, people are faced with two weeks of days and two weeks of nights, and they have to use computer-controlled glass walls and lights to simulate the same 24-hour day and night length as the blue earth, except that there are never four seasons here, and there is always only one climate here.

Look, looking from the distant night sky, small fireflies kept flying out of the low of the leaf in the dark night, and then with the leaf floating for a while, the butt sprinkled a little starlight, slowly flew towards the greater satellite, and finally threw itself into the arms of the satellite. Also on the satellite, there are quite a few fireflies that slowly fly towards the leaf, and finally moor on the leaf, and of course, there are fireflies from the more distant Earth that slowly fly towards the leaf.

The Leaf Space Station, which is in geosynchronous orbit around the Moon, is in the final stages of construction and is always busy, with a steady stream of cargo and passenger spacecraft docking and departing every day. This great space carrier represents the crystallization of the highest wisdom and technology of mankind, and it is basically in accordance with the original design and plan under the joint efforts of all mankind to carry out the final sprint in an orderly manner.

In a small lunar spacecraft that had just left the leaf space station and flew to the moon, Zhang Lu used her watch to connect with Bei Bei on a two-dimensional video call.

In the small screen of the watch, Bei Bei wore a cloak and looked at Zhang Lu with a smirk, "How about it, it's fun on it, right?" ”

Zhang Lu felt fresh and a little anxious in the face of this unfamiliar environment, because she left Aunt Sarah and will go to the human scientific research base on the moon, where she will complete her studies.

Zhang Lu felt a little frustrated because she was so far away from her dearest friends and family because she had left Aunt Sarah, so she forced a smile: "It's good, I just said goodbye to Auntie, left the Yezi Space Station, and now I'm ready to land on the moon." ”

"In this case, then you have to be careful all the way, miss you." Bei Bei grimaced at Zhang Lu.

Zhang Lu looked at Beibei's carefree appearance, and suddenly missed her very much, and she was always in such a happy mood with her. She smiled bitterly and glanced at Beibei: "What, are you going to sleep, dressed like this?" ”

Bei Bei was a little surprised and said, "Of course, it's past 11 o'clock in the evening." By the way, why are you still in a hurry, so late. ”

Zhang Lu looked up at the window when he heard this, the huge moon in front of him was white, and there was no intention of turning black, and then he shook his head at Bei Bei depressedly: "It's strange, it's still daytime here, no wonder I feel so tired." ”

In fact, Zhang Lu received special training before landing on the moon, and it was only in the past few days that she noticed and learned about these natural phenomena on the moon, and the days and nights on the moon would be very long. However, in order to allow human beings to live and work normally and ensure people's quality of life and efficiency, the human base on the moon also simulates the day and night of the earth through scientific and technological means.

Bei Bei suddenly reflected, she blinked very seriously with a pair of big eyes and playfully looked at Zhang Lu: "I know, there are two weeks of daylight on the moon, hehe, it seems that you will slowly change and adapt to the study and rest time on the moon in the future." ”

Zhang Lu pretended to scratch her head embarrassed, she knew that Bei Bei loved natural science, and she knew more about this than herself, and muttered: "That's it, it's really troublesome." I kind of don't like it here anymore and I want to go home. ”

"Look at you, that's all, learn to adapt, genius, don't let me look down on you. Alright, I'm going to sleep, good night. After speaking, Bei Bei took off her pajamas, put her watch on the side of the bed, and lay down to sleep.

Zhang Lu could barely see half of Bei Bei's body lying on the bed, and knew that she hadn't rinsed her mouth yet, so she begged: "Bei Bei, don't hang up, I'm telling the truth, I want to look at you, I really don't like it here." ”

"Die!" Bei Bei didn't move, and replied directly, but she didn't get up and hang up the video call.

Zhang Lu looked at Beibei's carefree appearance, feeling a little happy for her, but a little lost, so Zizi scolded in her heart: "Stinky girl, look at how I clean you up when I go back, I can't get used to seeing you so happy." ”

However, Zhang Lu was still a little unwilling, so she tried to deliberately find something to talk about: "Beibei, I heard you say that the Blue Sky Natural Science School sent you an invitation letter to invite you to be a senior teacher in the Department of Natural Sciences, did you accept it?" ”

"Hmm...... I'm going to sleep, I'm sleepy. Bebe's faint voice came from over there.

"Hey, I'm asking you, get up, you haven't rinsed your mouth yet, you lazy worm." Zhang Lu was a little helpless, looking at the sleeping piglet, she was a little anxious: "Slut, hurry up, I haven't finished talking yet." ”

"Hurry up and sleep, I'm sleepy, bye-bye, love you." Bei Bei sat up suddenly, picked up the watch and said hurriedly to Zhang Lu, and finally pursed her lips and gave Zhang Lu a flying kiss: "Hmm", and then hung up with a snap.

Zhang Lu looked at the blackened screen on her watch and didn't speak for a long time, she knew that she had to accept this reality, in fact, the moment she was admitted to the Lunar Academy of Natural Sciences, she was destined to be separated from Beibei, there was only one choice at the moment, she had to learn to live alone. So Zhang Lu didn't think about it anymore, leaned her head against the seat and closed her eyes, she couldn't remember how long she hadn't rested.

Zhang Lu was suddenly awakened by a shock after squinting for a while, she looked out the window, the spacecraft was estimated to be several kilometers away from the lunar surface, and had begun to prepare for landing.

At this time, the ship's engine has restarted to ignite, slowly counteracting the gravitational acceleration of the moon, and gradually descending towards the lunar surface at a uniform speed. Through the window, you can see that the regular moon base built by humans below is like a huge honeycomb, reflecting countless faint points of light.

The human lunar center base is located near the center of the Chenghai region, which is the largest and most important base among the five major bases of the human moon, and the other four bases are established in the rain sea area, the quiet sea area, the cloud sea area and the air sea area.

Looking down from space on the moon, every base on the moon resembles a giant honeycomb. Because human beings on the surface of the moon rely on a dense adjacent transparent giant glass cover to communicate with each other, each giant glass cover can reach 600 meters or even 900 meters in diameter, and they are connected or isolated by a central computer to ensure the atmospheric pressure balance between the various units.

The construction area of the Chenghai central base is about 42 square kilometers, with a total of 56 giant glass covers, and there are 12 small spacecraft exchange cabins and 6 large exchange cabins at the southernmost end of the base, which are divided into two rows and connected with the base.

At this time, the lunar spacecraft in the air was like a well-proportioned small lantern slowly landing, and the vibration of the spacecraft's engine was getting louder and louder, and it was still more than 100 meters away from the exchange module of the lunar base.

After Zhang Lu's intelligent autopilot spacecraft was qualified to land before approaching the base, the first small exchange module in the easternmost area slowly opened in advance. The exchange module of this base looks like a large round pumpkin, and the eight petal-like sealed door pages open to the sky to form a circular gate with a diameter of 16 meters, and then the small spaceship with a diameter of about 8 meters can easily pass through the top door and land smoothly in the spacious exchange module.

Except for its shape, the swap chamber here is functionally identical to the swap capsule of the Leaf Space Station. After the small spacecraft entered the exchange cabin, the system automatically injected an atmospheric pressure of air after the hatch was firmly closed and sealed, and after Zhang Lu and several other passengers waited for the spacecraft to turn off, the space chairs they were riding in automatically slid into a sub-exchange cabin next to them one by one, and when the door was closed, the inner sub-exchange cabin was immediately filled with air.

Zhang Lu finally stepped on the moon for the first time after completing the bacterial test in the sub-exchange module, the biggest difference between here and the earth is that the duffel bag on her back feels much lighter, and her steps are relaxed, she can't help but jump lightly, and actually jumped dozens of centimeters off the ground.

"Hee-hee!" Zhang Lu smiled happily and proudly walked to the safe passage leading to the interior of the base, she couldn't wait to see the scene inside the base. You must know how much human energy and resources it took to build this place, so she must observe and feel it.

Zhang Lu walked through the security passage with an abacus, and when she walked to the gate at the end of the passage, the door opened automatically.

"Welcome to Area 55 of Chenghai Central Base." Behind the gate of the exchange cabin connecting the Area 55 base, two beautiful hostesses stood in front of the luxurious service desk and said in unison.

Zhang Lu nodded to them in a friendly manner, and then looked around, to her great surprise, it was obviously daylight outside the spaceship just now, but it was already lit up here.

Zhang Lu looked up at the glass above his head, and realized that he couldn't see the outside world at all, obviously it was night here. Zhang Lu remembered the introduction above in the introduction of the admission notice, the days on the moon are about 14 days long, so people here work and rest according to the time on the earth.

Bei Bei also reminded Zhang Lu that that cute girl is always so keen on extraterrestrial culture and deep space topics, and I don't know why, Zhang Lu suddenly remembered Bei Bei in her heart, but she has already fallen asleep now.

"Hello, it's 11:43 p.m., you're a student at the Academy of Natural Sciences, right?" One of the girls came to Zhang Lu very professionally and asked.

"Yes, my name is Zhang Lu, and it's my first time here." Zhang Lu looked around, and the huge train station in Area 55 was empty at this time, and only a few people near here were in a hurry.

"Okay, I'll guide you how to take the car, there will be a train directly to the gate of the Academy of Natural Sciences in 5 minutes, you see, it's train 047." The enthusiastic girl seemed to have just come over to take over, and she was in good spirits, and she turned her head and pointed to the three-dimensional screen above her head, which showed that Terminal 047 was indeed the Academy of Natural Sciences, and the train departed at 11:50.

"Thank you." Zhang Lu pulled the straps of the two backpacks on her shoulders with both hands, smiled politely at them, and then walked straight to the train in front.

Here, all kinds of consumption and consumption in people's life and work, including food and housing, are free, such as transportation, daily necessities, consumables, meals, etc. are also free. These are all introduced in the admission notice, so Zhang Lu will not spend a penny to go to school here, and he will not have the opportunity to spend a penny, because this is the common property of mankind, as long as those who are qualified to enter here, they can enjoy all the resources here unconditionally, except for tourist areas, of course.