"A lot of things......

Looking at each project, it is obvious that people's living environment is moving closer to the earth, with artificial sunlight in the sky, greenery on the roadside, and oxygen produced by plants. No matter how picky people are, they can feel that the living environment is improving dramatically.

Because it is now working time, there are very few people on the street, and those who walk by are also in a hurry, some are contemplative, some are smiling, and their expressions are different, but generally speaking, there are mostly positive emotions.

In the end, Yu Yifeng and Roman came to a meadow, which is also one of the main contents of environmental transformation.

Seeing this piece of grass, Yu Yifeng suddenly squatted down and carefully stroked the grass in front of him. They are thick and short, bright green, very ordinary, and very solid.

I really miss it...... Although it is just the most ordinary loess, the most ordinary grass, and I don't even know its scientific name, the combination of these brings a very intimate feeling to Yu Yifeng.

There is no such lawn on the lunar base. In the past, the Noah did not have this kind of lawn, but now it ...... People finally did it, with soil, lawns, and unknown wildflowers.

Sitting quietly on this lawn, feeling the sun's rays, the breeze blowing slowly around you, and a few ants crawling under your feet from time to time...... This lazy feeling gave Yu Yifeng the illusion of returning to the earth.

It's a kind of homesickness......

In Yi Feng's hometown, there is such a tradition: when a wanderer goes out, he will always bring a handful of soil from his hometown. Whenever I miss my hometown, I see my hometown as if I were looking at my hometown...... However, the current human beings do not even have the ability to take a handful of homeland soil.

When you lose your home planet, you know that your home planet is really good. Maybe human beings will always be like this, and they will only know how to cherish when they lose it......

After a long time, Yu Yifeng got rid of this homesickness, slowly stood up, and sighed lightly.

Earth, human beings can't go back. Human beings can only keep moving forward and never retreat!

Roman seemed to empathize with Yu Yifeng, and only then did he come back to his senses. "This lawn is a natural park that we are about to build. The area of the park is not very large, about 1.2 square kilometers.

It took a lot of effort to create Earth-like soil, with a small ecosystem of insects, small herbivores, and small carnivores. ”

Hearing this data, Yu Yifeng's brows furrowed tightly. 1.2 square kilometers? It wasn't what he wanted. According to the plan, this natural park should have lakes, grasslands, trees, rockeries, how can 1.2 square kilometers be?

"1.2 square kilometers? It's too small, right, why is it so small? ”

"Because...... Our technology can't make the whole ecosystem circular. Dr. Roman shook his head, "I'm going to try a small ecosystem first, and then try a bigger one." ”

"Why?" Yu Yifeng wondered.

"Let's put it this way, we don't have enough technology, or resources. If the park is too big, the amount of water that needs to be irrigated every day is a lot. We can get about three Qinghai Lake water from Mars, which is not too much, and we can't waste it at will. ”

"In addition, the transpiration of plants will emit water molecules into the air, but these water molecules will only accumulate in the spaceship, and will not form clouds or rain like the earth. So the humidity in the air is going to get higher and higher, and then the whole ship is unusually humid, and I don't think you want that. ”

Yu Yifeng nodded, this was something he didn't expect.

"For the problem of humid air, we can only use an air dehumidifier, and by the way, we can also recover some of the water...... Once the park gets bigger, it will have to build more dehumidifiers and consume more electricity, which I don't think is necessary. ”

Yu Yifeng held his chin and understood, Roman meant that small parks are easier to control, and people don't have the conditions and technology to build large parks. It's that he thinks too simply, all artificially created things are complex and exquisite, like walking a tightrope, it can be said that it affects the whole body.

Human beings have not yet been able to build an ecological environment like the earth, but a system with self-regulating ability like the earth is what biologists dream of. The 1.2-square-kilometer park ...... "Alas, so be it, for humans now, it's not bad." Yu Yifeng nodded helplessly.

"We've also taken a lot of air from the Martian atmosphere and sealed it elsewhere, so we don't have to worry about not having enough carbon dioxide in the future......," Dr. Roman added.

"Oh, yes." He patted his head and suddenly said, "There is a discussion on the universe this afternoon, I hope you can come and listen to it." ”

"Oh? What is the main point? Yu Yifeng asked, if it is more interesting, of course you can participate, I just happened to be free this afternoon.

"Conjectures about life, civilization, and intelligence. Many biological scientists, physicists, cosmologists will participate, and the content will be ...... Alas, I think you should listen to it. ”

Since Dr. Roman said so, Yu Yifeng immediately nodded in agreement. Human beings really know too little about the universe, and if scientists come up with something, it is of course a good thing, and he, as a leader of civilization, should listen to it.

……

Human beings, from the moment of the birth of wisdom, have begun to explore the universe and explore the meaning of life and wisdom.

The four great civilizations in human history have their own views.

In China, there has been a saying that the sky is round and the place is round since ancient times, and its essence originates from the evolution of innate gossip.

Other ancient civilizations have a similar view: the ancient Egyptians, because they lived along the Nile River and the terrain of the whole area was narrow and narrow, and believed that the universe was like a long box from north to south, and the earth was floating on water, and the sun, moon and stars were hung on the roof, supported by divine power......

The Babylonians believed that the sky covered the earth like a dome, and that the sun, moon, and stars each had life and moved on the canopy.

The ancient Indians believed that the earth was carried by four elephants......

These are strange opinions, and they are all conclusions that people draw based on the phenomena they see in front of them and then make bold conjectures.

It was not until the 4th century BC that the ancient Greek philosopher Aristotle proposed a slightly more reliable "geocentric theory".

Then, in 1543, Copernicus came up with a more accurate "heliocentric theory". Copernicus believed that the Sun was at the center of the universe and that the Earth and other planets orbited the Sun in a circular orbit.

It can be said that mankind's discovery and exploration of the universe is a process of continuous correction and improvement......

Modern science believes that the Sun is just an ordinary star in the Milky Way. The Milky Way is just an ordinary river system in the vast universe. Even the "heliocentric theory" has been denied.

And then, what else do people know? Perhaps, modern science is still wrong......

Tiny human beings, who have never found extraterrestrial life, have never seen even a shadow. The only discovery was the Noah spacecraft, but what about extraterrestrial life, it was not discovered, where did they go? Nobody knows......

In the year after the explosion of the Earth, people had to step into the stars, only to discover extraterrestrial life on Mars!

Although it's just some viruses that are not even as good as prokaryotic cells. But what does this mean, and what can one deduce from it?

This is the main purpose of this scientific discussion. We want to gather everyone's wisdom and discuss the life, wisdom and civilization of the entire universe. At the meeting, a female scientist was the first to speak.

The initiators of this discussion are astronomer Professor Thomson, biologist Dr. Roman, and a female astronomer named Heigel, who is the moderator of the conference.

Yu Yifeng sat down below, just an ordinary listener.

Many of the scientists present looked serious, and Yu Yifeng even tasted a sense of not being very comfortable. Obviously, the discovery of the Martian virus is not a good thing for mankind.

Wasn't the Martian virus conquered by humans? It is said that even the genetic sequencing is almost indicating. Why is it not a good thing? He just wondered.