Chapter 902 Only Send

Chapter 902 Only send...

Why did the alien spaceship, Ogun, come here?

It is obviously not for humans. Ogun has a very long history. When the Australopithecus appeared, it was already on the road. Its birth was obviously earlier than humans. Unless its builders mastered some technology beyond the law of causality, otherwise, this thing could not be for humans.

But every part inside Ogun shows that its builders have a technical level comparable to that of the Earth, let alone such a technical level.

But it is obviously not for spreading information about its own planet. The symbol system in the core of Ogun is not for the convenience of aliens to interpret. It simply combines the two considerations of noise resistance and information density.

The Pioneer 10 and Pioneer 11 space probes launched by humans in the 1970s carried the famous "Pioneer gold-plated aluminum plate". In the upper left corner of the plate, there is an image of the spin transition in a hydrogen atom, because hydrogen is a substance that exists widely in the universe. Below this symbol is a short straight line, which represents the binary "1". In this hydrogen atom, the electrons in the spin-up and spin-down can indicate a length (its wavelength is equal to 21 cm) and a time length (frequency is 1420 MHz). These two derived units are used to calculate the meaning of other symbols on the board. On the 14 lines, there is a series of numbers written in binary form, which represents the pulse signal period of 14 pulsars (neutron stars) in the Milky Way. Since the signal period of each pulsar varies with time, the aliens can calculate the launch time of the spacecraft based on the pulse period at that time. The length of the line represents the distance of those pulsars relative to the sun. The mark at the end of each line represents its Z coordinate intersecting on the galactic plane.

In addition, there is an image of a human male and a human female on it.

This set of information was later put into the Voyager as the cover of the Voyager Golden Record.

Although the amount of information is small, it can at least be shown to aliens, and aliens can probably interpret it.

As for the symbols in Ogun, humans have no way to interpret them.

David said without hesitation: "Let's build a large spaceship first."

"Hmm." Xiangshan nodded: "Then what?"

Yawgmoth raised his hand and asked: "Anything else?"

"There are many questions. This is a systematic project, my friend. It is not just a scientific problem." Xiangshan shook his neck: "For example, can a spaceship like Ogun be used for immigration?"

David shook his head: "Obviously impossible. Its strength is too low, it can't withstand acceleration and deceleration, and even if it passes over a large mass celestial body, there is a risk of being torn apart by gravity - tsk tsk, think about it, it is lucky that it was not torn apart by Jupiter and Saturn. Oh yes, it will take a century just to fly out of the solar system."

"Then make the spaceship smaller..." Yawgmoth said. If you can't build a spaceship with enough shear resistance to maintain a huge posture, then make it smaller. But he quickly shook his head and rejected it himself: "It seems that it can't be too small. But it shouldn't be as small as Ogun."

Any species has a minimum requirement for the size of its own "gene pool" - or the richness of its own species' genes. Adam and Eve are nonsense in biology. It only takes one generation for Adam and Eve's descendants to face the problem of inbreeding. The coefficient of inbreeding between first-degree relatives is 1/4. In other words, for the individuals they conceive, each pair of alleles has a 25% chance of coming from the same common ancestor of the parents. This will increase the risk of autosomal recessive genetic diseases in their offspring, and it won't be long before they fall into collapse.

As for how many people are needed, humans themselves have not actually studied it thoroughly. Some people think that this may require hundreds of people. Others think that at least 160 people are needed. Of course, some scholars are more extreme and believe that the minimum number of people is only 98 - a healthy group of 98 people is enough to rebuild human civilization.

In fact, genetic research also supports this theory. Some scholars believe that the total gene richness of the entire human race is not as good as that of a chimpanzee family. In a past that seems very distant to humans, but is very close to the present from an evolutionary perspective, humans suffered natural disasters, and only a few hundred Homo sapiens were left. Then, these modern humans' "sparks" multiplied to every corner of the earth with the extremely excellent configuration of Homo sapiens.

Xiangshan sighed: "On the contrary, Yoge. This is not just a biological problem. People have accidental deaths. If you bring a relatively extreme number of people, then if any one of these people dies, the gene pool of the immigrant group will lose a precious piece of the puzzle."

David nodded: "Space is not safer than the earth. Oh, yes, the human body is adapted to the earth's gravity. Without centrifugal force to simulate gravity, human reproduction and growth will be affected."

"Secondly, it is the issue of fertility willingness. If accidental deaths are not considered, then every couple must have two children, and then these two children must grow up safely, and then each child will have two pairs of children with his partner after marriage. This is the only way to keep the population unchanged. But how can there be such a safe thing? Accidental deaths are always inevitable. Besides, not everyone now expects to have multiple offspring."

"Even in extreme cases, if a poor fellow is not popular with the opposite sex, then humanity will suffer great misfortune - the gene pool of the immigrant group will lose another piece of the puzzle forever."

"In addition, there are also problems such as emotional discord after the couple gets married - unless there are regulations prohibiting free love, everyone waits for the system to assign a spouse. But that is too inhumane and prone to short-sighted self-selection. So you have to prepare ten or a hundred times the minimum number of people."

"And in order to ensure that this immigrant group does not develop mental problems on the ship and think about how to kill their companions all day to relieve boredom, they must be given a certain amount of space for activities."

"What about hibernation?" Yawgmoth asked.

David said: "Even the tardigrades, which are the best at cryptozoology, cannot guarantee that they can come back to life 100% after faking their death. At the current level of technology, human hibernation technology is nonsense. It may not be possible to revive even if hundreds of them are frozen."

"Freeze sperm and eggs? In this case, it is enough to have one sperm alive among millions of sperm." Yawgmoth said: "Hibernate a group of teachers... No, just let AI raise them? In this way, the spacecraft can be much smaller."

David spread his hands: "Artificial womb is a technical problem. And will children educated by AI have any identification with human society? They can already be considered another civilization."

David sighed: "After all, why should we design an immigration fleet with the current level of human technology? This is impossible."

"How do I know." Xiangshan sighed: "Suppose, NASA finds that the sun has signs of becoming a red giant, which may be tomorrow or five hundred years later. This process will be very sudden, and humans may lose their homeland at any time. While studying group refuge plans, humans must find ways to use existing technology to preserve the genetic information of their own race..."

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