Life may have different forms, and their requirements for the environment are also different. For one creature, it may be a hellish environment, but for another creature, it is a paradise. For example, before leaving the earth, Xiao Yu
How could you possibly have thought that there are creatures like black worms existing on Titan?
Until now, there are still some specimens of black insects on Xiao Yu's spaceship. Analyzing from the current perspective, Xiao Yu believes that these black insects should also be classified into the category of alien beasts, rather than ordinary
biology.
This situation has brought certain difficulties to Xiao Yu's detection activities in search of intelligent creatures. The reason is very simple, because Xiao Yu does not have a unified method to define which star systems are worth getting closer to detect. Instead, all
It is obviously unrealistic to detect all stars.
The density of stars here is slightly higher than that of the solar system. Within twenty light years, there are probably more than a thousand stars. Xiao Yu does not think that his luck can be that good.
Intelligent creatures have been found within these twenty light years.
Xiao Yu's psychological bottom line is within three thousand light years. Xiao Yu plans to spend no more than two thousand years to complete this task. The number of stars within three thousand light years is an astronomical number. If every
If a star has to be detected at close range, even if the time period of two thousand years is expanded ten times, it will not be enough.
In order to deal with this situation, Xiao Yu summoned all the scientists under his command and held many discussions.
"First of all, I believe that there must be liquid substances on the living planet, whether it is liquid water, liquid methane, or ethane. In short, there must be liquid substances. Because the energy exchange within the living body must be in a liquid state
Matter is the carrier.”
A scientist expressed his opinion.
"No, I don't agree with this." Another scientist objected, saying: "Although our more than one hundred races all use liquid substances as carriers to exchange energy in the body, why in this universe?
Why can't there be organisms that use gaseous substances as carriers to exchange energy? After all, theoretically speaking, gaseous substances can also do this."
The scientist's speech caused a lot of discussion.
"This point is temporarily doubtful. We can't prove or deny it. Let's move on to the next discussion. It's also about material exchange. I think that a suitable life planet must have a liquid core. Only a liquid core can
There will be orogeny only if there are geological activities, and then there will have to be a satellite huge enough to create tidal force and wind for it to form a global exchange of materials."
"I don't agree with this. I think we can expand its scope a little further. As long as a planet has an atmosphere, it is of sufficient value. Under the light of stars, the imbalance of atmospheric temperature will cause atmospheric
Flow, the material exchange brought about by these flows is enough."
Another scientist expressed his opinion.
"No, it doesn't necessarily need to be this way. Why must atmospheric flow and material exchange be necessary? Isn't it possible for a planet without an atmosphere to evolve life? I don't agree with this. I think this restriction can be lifted."
…………
This discussion lasted for two full months. Xiao Yu relaxed the restrictions again and again, combined the environment of the respective needs of these more than 100 species of creatures, and the conditions of their home galaxies, and finally came up with the following
Some conclusions.
Xiao Yu believes that these conclusions should be universal at least in the Milky Way. In other words, as long as there are intelligent creatures on the planet, they will generally meet the following conditions. There will definitely be exceptions, but the number will not
There are too many and can be ignored. In the future search process, I will take actions guided by these points.
First of all, in a star system where living things can exist, its main star must be stable and be able to output energy steadily and persistently. This excludes all stars that are in their final years and infancy. Because of the stellar activity in the infancy
It is too strong, and the interior of the galaxy is too chaotic. An asteroid impact with a diameter of more than ten kilometers may destroy the bud of life. In a newborn star system, an impact of this degree can only be regarded as trivial. Old stars
It will turn into a red giant, and the stellar activity will become more intense.
Secondly, its lifespan must be long enough. Because only the lifespan of the main star is long enough to provide sufficient time for the slow evolution of organisms. This excludes all giant stars.
Because the mass of a star is inversely proportional to its lifespan, the greater the mass, the shorter its lifespan. A star with a mass dozens of times that of the sun may have a lifespan of only a few million years or even shorter. On a cosmic scale, such a short time is just
It is fleeting. Such a short time is obviously not enough to evolve intelligent creatures.
Third, living things should all appear and evolve on planets. Although Xiao Yu cannot rule out the possibility that there is life on stars, this possibility is too small and can be ignored. This makes all life without planets possible.
star systems are excluded.
The remaining points are, for example, the living planet must have a large enough satellite to slow down its rotation and create tidal force to facilitate material exchange, and for example, the outer layer of the living planet must have a large enough gaseous planet to provide protection for it, and
Or the distance to the star must be appropriate, liquid water must exist on it, and other conditions. Because it could not prove its universality, it was abandoned by Xiao Yu.
In other words, Xiao Yu believes that as long as a star system meets the above three conditions, it will be worthy of close detection.
The current status, age, mass, lifespan, etc. of a star can be analyzed by restoring light. Whether there are planets can be determined by the wobble method and occultation method. There is no distance limit or detection range when detecting through light.
Greatly increased, Xiao Yu can conduct these detections on any star system within twenty light years at any time.
If it meets these three conditions, then Xiao Yu will change its course and approach the star to use tachyon detection methods to detect it at close range. If the detection results show that there is an intelligent civilization surviving, the fleet will break away from the super-light speed and station here.
, if there is no sign of intelligent civilization survival, continue to detect the next planet.
Under such loose conditions, the number of eligible star systems has greatly increased. Basically, one out of every hundred stars meets the conditions. Massive stars and aging, young stars are only a minority after all, and planets are
The existence is not as sparse as Xiao Yu originally expected. You must know that among the conditions set by Xiao Yu, there is no requirement that the planets must be rocky planets. In other words, Xiao Yu believes that among the gaseous planets,
There is also the possibility of intelligent life.
Xiao Yu does not expect to get results in this work in a short period of time. This is a new round of finding a needle in a haystack, and it requires Xiao Yu to put in a lot of energy and patience before he can gain anything.
"This star is not bad, of moderate size and age, and the planet is actually a rocky planet with a mass of 1.6 times that of the Earth... Well, it's worth a look." During the long journey, the detector reported a message
The message caught Xiao Yu's attention.
Before this, Xiao Yu had searched for at least 500 star systems, but every time he ended up with disappointment. The terrain, geology and other conditions of various planets are all kinds of strange, not to mention intelligent and civilized creatures, even the most elementary creatures
Xiao Yu didn't even find one.
Some of these planets are extremely close to their host stars and are constantly being roasted by the flames of the stars. Under their own rotation, they are like roast ducks in an oven, fearing that they are not roasted thoroughly enough. Some
The planet is directly locked by the gravity of the star, and its rotation and revolution periods are synchronized. It always faces the star with only the same side, just like Mercury in the solar system, with one side being a hell of fire and the other side being a hell of ice.
Some planets are too chaotic. Without the protection of massive gaseous planets or the buffering of their atmosphere, they are under constant bombardment from interstellar artillery shells all the time, resulting in pits on their outer shells and craters everywhere.
Just like the moon. Some are too far away from the stars, and the entire planet is like an oversized ice cellar...
All kinds of different planets opened Xiao Yu's eyes, but at the same time he felt deeply disappointed.
"It turns out that in this universe, death and silence are the norm, and life is the exception. Based on the calculation that there is one qualified star among every one hundred stars, I have detected more than five hundred stars, which means
Now, 50,000 stars have been excluded, 50,000 stars, not a single life planet..."
"Life is such a magical existence." Xiao Yu sighed deeply in his heart.
Through this search activity, Xiao Yu once again felt the looming hand of conspiracy behind him. The reason is simple. Since the existence of life is so rare, and intelligent life is rare, then since he left the earth,
What happened to the many civilizations that I have encountered one after another since then? Why are I so unlucky, or should I say, so... lucky?
Xiao Yu didn't know what this meant.
"As I said before, do your best first, and then talk about the rest." Xiao Yu sighed secretly, "I hope the detection target this time will not disappoint me."
Xiao Yu once again changed the course of his fleet and sailed towards this star system. Tens of billions of kilometers behind him, the fourth-level alien beast was still following Xiao Yu looming like a piece of candy that couldn't be shaken off.