The transport spacecraft circled the moon for a total of four large circles before slowly adjusting its orbital position and officially docking with the space port.

    This technology is not too difficult. It is similar to the docking of the space station. It is divided into four stages: long-range guidance, short-range guidance, final approach and docking.

    After so many years of development, the technology has been quite mature.

    "All astronauts, please note that the spaceship is about to arrive. Please put on your spacesuit, enter the vacuum chamber and line up to get off the spaceship in turn."

    Zhang Yuan breathed out and put on a heavy nano silver ion radiation protection suit, which looked like a thick cotton padded jacket. Wearing a thick glass cover on his head, he followed the "swim" into the vacuum chamber after inspection, and then got into a rail train.

    "I''m floating up. Help!" A man''s voice sounded from his headphones behind him.

    Because there was no air, I couldn''t even do the action of "swimming", so I had to grasp the handrail and move forward.

    If there is no place to borrow and no one to help, it may float permanently in mid air.

    There have been such terrorist accidents. The unfortunate man floats in the space and is unable to borrow. The nearest handrail is only one meter away from him, but in any case, there is no way to move a bit. By the time the rescue team arrived, the guy had completely collapsed.

    So today''s space suits have a very small jet device, which can jet airflow to avoid this phenomenon. Of course, this function can be used or not. Any matter in the universe is precious.

    Zhang Yuan pulled the handrail and pulled him down slowly.

    This guy repeatedly said "thank you".

    This is the largest space port of mankind, Longmen 7. All astronauts will enter the huge annular centrifugal force zone along the central axis of the earth times.

    Not only the air can transmit sound, but any substance can transmit sound. The roar of the rail train is transmitted to the ears through the handrail on the hand, which has a very strong rumbling feeling.

    The earth times is the most proud work of the wolf Design Bureau.

    Zhang Yuan''s father was once one of the main designers of the wolf Design Bureau.

    In essence, it can be seen as a super large "balloon".

    In addition to the use of high-strength metal in important structures such as the central axis and engine room of the spacecraft, most other parts, including the ship wall and light sail, are very lightweight nano flexible materials.

    The universe is almost vacuum, the pressure is almost zero, but the spacecraft is full of air. According to the standard atmospheric pressure, the pressure is 1.01 × 10^5Pa。

    The pressure difference between the inside and outside is equivalent to ten tons of material per square meter under the earth''s gravity, which makes the whole spacecraft expand spontaneously to maintain the design shape.

    The advantage of this is that the spacecraft is very, very light, and makes full use of the super tensile capacity of nano materials themselves.

    Although the spaceship is huge, like a mountain, its weight is less than 800000 tons.

    Two girls were whispering in their headphones, but they inadvertently turned on a small public channel.

    "It is said that the nano material on the ship wall is only 4mm thick... It looks safe. What if it suddenly breaks?"

    "How could it break? That''s a nano material. It was expected that 1 mm would be enough, but for safety reasons, it was fully thickened by four times. "

    Listening to their dialogue, I should not have practiced in the space city, but a group of newcomers.

    Li Zhendong turned around and explained with a smile: "the spacecraft wall is a mixture of nanomaterials and aerogels. Just like reinforced concrete, nanomaterials are only 4 millimeters thick, but there are also aerogels lighter than air as load-bearing structures, so they add up to more than that thickness.

    "The structure of the ship is not what you think. The weightless area has no atmosphere and stores various material resources. Only the circular living area has an atmosphere. Inside, there is a honeycomb structure, which is divided into many small rooms, and the most peripheral places are uninhabited. "

    "Every room has a pressure sensor. If there is an accident in the periphery, it is difficult to immediately affect the inside. Don''t worry, we''ll repair it immediately! "

    "Are you a spaceship maintainer?" The sister stared and turned her head.

    She introduced herself very warmly: "Hello, my name is Li Yiyi. I''m a kindergarten teacher or a... Ha ha, painter."

    "My name is Li Zhendong. Everyone''s surname is Li. I have the same ancestor as you!"

    "Really, ha ha!"

    "We are all descendants of Lao Tzu."

    "Lao Tzu?"

    "Li Er!"

    "Oh!"

    Seeing Li Zhendong teasing his sister again and talking about quite boring topics, Zhang Yuan instinctively felt a little embarrassed for him. Can you talk about a normal topic, which seems to be of great cultural significance.

    As for what kind of spaceship maintenance personnel, I think too much... Ye Kaifu''s skilled technicians are the real spaceship maintenance personnel.

    Although they have a little technology, they won''t encounter real problems.

    "You are... Zhang Yuan! You are also an astronaut! "

    Zhang Yuan''s bag with a head. Hey, am I so famous? What happened

    A group of girls chirped around Zhang Yuan again.

    Li Zhendong spread his hands and was robbed of the limelight. He was quite helpless.

    The reason why there is such a strange job as "kindergarten teacher" is that 500000 young people will inevitably wipe their guns and get angry. Inside the spacecraft, we are encouraged to take contraceptive measures when we are passionate, but we will not force abortion. If we are pregnant, we can only be born.

    In short, with the support of various high technologies, the first basic goal of small society is self-sufficiency and maintaining the whole social form; The second goal is development.

    During this conversation, the rail train turned a corner and stopped slowly.

    Everyone swam into a large elevator again.

    The elevator will go from the position of the ship''s central axis to the bottom of the centrifugal wheel, and give all passengers a certain lateral linear speed.

    The earth time uses centrifugal force to simulate gravity equivalently. With a radius of 2km, the centrifugal wheel wants to generate gravity similar to the earth at the bottom. The angular velocity is about 0.071rads, which is equivalent to rotating once in 89 seconds.

    This angular velocity is not high, which means that the Coriolis force is very small, and it is very comfortable for humans to live in it.

    "Di", the elevator door finally opened. Everyone entered a small room and took off their spacesuits.

    The temperature is 24 ℃ and the air humidity is 50%.

    Zhang Yuan stepped on the floor excitedly. The texture of his feet was a little similar to that of the carpet, but without losing hardness.

    Moreover, it has gravity similar to that of the earth, which is very convenient to move.

    It''s just that I''m in weightlessness these days. My bones are a little scattered. I can walk for a while and a half. It''s a little hard to walk.