The environment determines the form of the creature, and the environment also shapes the character of the creature, and the three-body person who is full of love and peace gradually becomes rational.

Despair, hope, are useless, they just yearn for the continuation of the race.

"A very self-reliant race, then, let me help you!"

Zhang Xuan thought about it together, and smoothed out the gravitational fluctuations that were about to explode, and gave this group of poor creatures a long period of constant temperature.

However, Zhang Xuan smoothed out this gravitational force and also drove the gravitational waves.

This waveform spreads out and enters the cosmic battlefield, and with the wisdom and detection methods of galactic civilizations, they will find this abnormal fluctuation.

There are pros and cons, gravitational waves travel at the speed of light and enter the cosmic battlefield, which will take 7,420 years.

And the closest space node in this star field is a cantilever sixteen light-years away.

In this way, the Trisolarans need to enter the stellar age in 7,436 years, so as to avoid the attack of galactic civilization.

Otherwise, there is only a dead end.

Zhang Xuan saved them, but also kicked off the countdown to extinction for them.

For all this, Zhang Xuan has no sense of guilt, the urgency of saving people, and other things are none of his business.

And the civilization on the earth is also slowly progressing.

Unlike the high temperature of the Trimaran Star, where most of the organisms are nitro-based life, the Earth is relatively stable, giving birth to carbon-based life that occurs on a huge number of planets.

This is due to the chemical stability of its organisms.

Life is actually a chemical reaction, and the chemical reaction is closely related to temperature, and the essence is a covalent bond for temperature change.

Although they are both carbon-based life, the types are different.

The organisms on Earth are aerobic organisms and need oxygen to breathe, while the rest of the planetary organisms, some need to breathe ammonia, some need to breathe carbon dioxide, and so on.

They breathe in different elements and exchange specific elements for their bodies to be able to move.

Even life on Earth has primitive anaerobic organisms, and if you give it oxygen, it will die.

After the advent of Homo sapiens, the earth changed rapidly, living beings adapted to the environment, and intelligent beings could transform their living environment.

Appearing to have no sharp claws and teeth, Homo sapiens are supposed to be at the bottom of the food chain, but Homo sapiens can stand, which makes them much faster.

Their shoulders are backwards, which allows them to throw and launch ranged attacks.

The deterioration of their teeth makes them omnivores, greatly increasing their chances of survival.

And the most exciting thing is that their wisdom has been developed, animals are domesticated, food is grown, houses are built, and clothes are made, which makes them much more adaptable to the temperature and not afraid of the cold.

Thousands of years are just a moment.

Unlike the sane, cold, and united Trisolarans, the people of Earth are scattered all over the world, fighting endlessly, and technologically lagging behind the Trisolar.

Civilizations that were originally on the same level have developed very differently.

The civilizations on the earth are diverse and have large gaps, while the civilizations on the Trisolaran are highly unified and have clear goals.

Maybe it's the difference in the external environment, it's inevitable to be born in sorrow and die in peace, not to mention that the earth is born in peace, for this, Zhang Xuan is a little regretful.

Two civilizations with the same starting point, in the same time, developed extremely unevenly.

It's like the Seven Monsters of Jiangnan and Qiu Chuji have decided that Guo Jing and Yang Kang will compete eighteen years later, but Guo Jing's skills have surpassed Yang Kang early, and he is bored. Cow Bar Literature Network

Although he wants to see the fierce battle of evenly matched opponents, Zhang Xuan is still more of an observer, the theoretical science of the earth is the same as the three-body problem, as long as you pay attention to it, the improvement of technology is only a moment.

Tomb of Yang Dong.

Zhang Xuan wore a ragged coat and swept the floor in this cemetery, working as a caretaker, and his job was to prevent someone from stealing and stealing ashes to sell.

The most stolen ashes were the ashes of children and unmarried women.

There is no Dao inheritance in this world, and there is no Three Realms to maintain the operation, and it is actually useless to steal people's ashes.

The soul of the deceased will soon be washed away by the radiation and disappear without a trace.

Today, it is not Yang Dong's death day, no one will come to the cemetery every day to grave people, but today, on an ordinary day, in front of Yang Dong's tombstone, there is a man and a woman.

The woman is an old woman, a gentle and calm professor, she is Yang Dong's mother Ye Wenjie.

The man is a young man in his thirties, a little handsome, he is Yang Dong's high school classmate, named Luo Ji.

The male classmates of high school came to worship, and Luo Ji was also one of Yang Dong's admirers, but unfortunately, there was no result.

It was too far away, and it was a matter of time for him to get the news of Yang Dong's death and the cemetery.

"Teacher Ye, why are you here?"

Luo Ji was a little nervous, he was originally coming to see Yang Dong alone, but he didn't expect Yang Dong's mother to come.

However, he still quickly restrained his sadness, on the one hand, he couldn't show weakness, and on the other hand, he was afraid that Ye Wenjie would also be sad.

"I remember you, are you? Luo Ji? Xiao Luo, right? I've come to my house to ask questions before! ”

Ye Wenjie was a little in a trance, a little clear, she heard her daughter talk about this person.

"Yes, it's me, your memory is still so good! I heard that you have been rehired to continue teaching students? ”

Luo Ji greeted him, and his mood had recovered.

"It's me, teaching the children, and having something to do, Dongdong said that you don't want to do physics, go to astronomy?" Ye Wenjie asked.

"Yes, but astronomy is ironclad, and it's not easy to get grades, so I'm going to do sociology again, which is easier to drill through, and it's better to get grades!" Luo Ji said.

He is a prodigal son of love, but also an academic prodigal, he is very intelligent, although he is studying across fields, he is still very good, he is already a full-fledged professor in the university.

A university professor in his thirties is no ordinary person.

"So big?"

Ye Wenjie suddenly thought about it, as the commander of the earth's three-body organization, on the one hand, she hates human beings, but on the other hand, she has deep compassion for human beings, she has already set her eyes on the pan-species universe.

"It's a bit impetuous, and I know it's not good!"

Luo Ji smiled bitterly: "I have no ambitions, a hammer in the east and a stick in the west, knocking back and forth!" ”

"Don't say that, there is always a need to live!"

Ye Wenjie smiled: "I have a suggestion, why don't you study the sociology of the universe?" ”

"Cosmic sociology? It seems ~"

"A name I gave up casually is that in the fake universe, in addition to the earth, there are many terrestrial planets, among which civilizations may be born, and in the order of magnitude of the universe, there must be a lot of such civilizations, so what will the society they form look like?"

"But sociology is a plural form, and if you want to study the cosmic society, you must at least know the society of another planet, but we only know the civilization of the earth!"

"yes, it's because no one is doing this, so it's a new field, a new opportunity, don't you think it's valuable?" Ye Wenjie said.