Chapter 300: 3 conditions

Life may have different forms, and they have different requirements for the environment. It may be a environment for one creature, but it is heaven for another creature. For example, before leaving Earth, how could Xiao Yu think that there is a black worm living on Titan?
Until now, there are still some black worm specimens on Xiao Yu's spacecraft. From the current perspective, Xiao Yu believes that these black worms should also be classified into the category of alien beasts, not ordinary creatures.
This situation has brought some difficulties to Xiao Yu's detection activities in search of intelligent creatures. The reason is simple, because Xiao Yu doesn't have a unified method to define which galaxies are worthy to approach and explore. Observing all the stars once is obviously unrealistic.
The star density here is slightly higher than the star density of the location of the solar system. Within twenty light years, there are probably more than a thousand stars. Xiao Yu doesn't think his luck can be so good, he can find intelligent creatures in these twenty light years.
Xiao Yu's psychological bottom line is within three thousand light years. Xiao Yu intends to spend no more than two thousand years to complete this task. The number of stars in the three thousand light-year range is an astronomical figure. If each star is to be detected at close range, it is not enough to expand the time by two thousand years.
To cope with this situation, Xiao Yu convened all his scientists and conducted many discussions.
"First of all, I think that there must be liquid matter on the planet of life, whether it is liquid water, liquid methane, or ethane. In short, there must be liquid matter. Because the energy exchange inside the organism must be in the liquid state Matter is the carrier. "
A scientist expressed his opinion.
"No, I don't agree with this." Another scientist objected, saying: "Although all of our more than a hundred races exchange energy in the body with liquid substances as carriers, why in this universe There can be no living things that use gaseous matter as a carrier for energy exchange? After all, theoretically, gaseous matter can do exactly that. "
The scientist's speech caused a lot of debate.
"This is temporarily questionable, and we cannot prove or deny it, so let ’s move on to the next discussion. Also about matter exchange, I think that a proper life planet must have a liquid core, and only a liquid core can If there is geological activity, there will be an orogenic movement, and then there will be a sufficiently large satellite to create tidal power and wind for it to form a global material exchange. "
"I don't agree with this. I think we can expand its scope a little bit, as long as a planet has an atmosphere, it is of sufficient value. Under the illumination of stars, an imbalance in atmospheric temperature will cause the atmosphere Flow, and the material exchange that these flows bring is enough. "
Another scientist expressed his opinion.
"No, it doesn't have to be this way. Why do we need atmospheric flow and material exchange? Can't planets evolve without life? I don't agree with this. I think this restriction can be lifted."
…………
This discussion activity lasted for two months, Xiao Yu relaxed the restrictions time and time again, combined with the environment of the needs of more than a hundred species of organisms, and the conditions of their parent galaxies, finally came to the following A few conclusions.
Xiao Yu believes that these conclusions, at least in the galaxy, should have universal surnames. In other words, as long as there is a planet with intelligent creatures, the following conditions are generally met. There are definitely exceptions, but they are not too many and can be ignored. In the future search process, I will take these points as a guide to carry out actions.
First of all, there can be living stellar systems. The main star must be stable and can output energy smoothly and continuously. This excludes all stars in their final years and juveniles. Because juvenile star activity is too intense, and the galaxy is too chaotic. An asteroid impact more than ten kilometers in diameter may destroy the sprout of a life. In a nascent galaxy, such an impact can only be considered trivial. Older stars become red giants, and star activity becomes more intense.
Second, it must live long enough. Because only the life of the main star is long enough to provide enough time for the slow evolution of living things. This, once again, eliminated all the superstars.
Because the mass of a star is inversely proportional to its lifetime, the greater the mass, the shorter the lifetime. Stars with a mass several tens of times that of the Sun may have a lifetime of only a few million years or less. On a cosmic scale, such a short time is fleeting. Such a short time is obviously not enough to evolve intelligent creatures.
Third, creatures should all emerge and evolve above the planet. Although Xiao Yu could not rule out the possibility of life on the stars, this kind of possible surname is too small to be ignored. This excludes all star systems without planets.
The remaining points, for example, the life planet must have a sufficiently large satellite to slow down its rotation, and at the same time create tidal forces to form a material exchange, and for example, the life planet must have a sufficiently large gaseous planet to provide protection, and Or the distance from the star must be appropriate, and conditions such as liquid water must exist, because it cannot prove its universal name and was abandoned by Xiao Yu.
In other words, Xiao Yu believes that as long as a star system meets the above three conditions, then it has the value of bringing itself closer to detection.
The current state, age, mass, and lifetime of a star can be analyzed by means of reducing light, and the presence or absence of a planet can be determined by the swing method and the cover method. There is no distance limitation or greatly increased detection range for detection through light. Xiao Yu can perform these detections at any time for any galaxy within twenty light years.
If it meets these three conditions, then Xiao Yu will change course and approach the star to use the tachytron detection method to detect at close range. If the detection results show that intelligent civilization survives, the fleet will sail away from the speed of light and be stationed here. If there is no sign of intelligent civilization survival, it will continue to explore the next planet.
Under such loose conditions, the number of eligible star coefficients has increased greatly. Basically, one out of every 100 stars meets the conditions. Massive stars and aging. After all, juvenile stars are only a few, and the existence of planets is not as sparse as Xiao Yu originally expected. You know, among the conditions set by Xiao Yu, there is no requirement that the planet must be a rocky planet. In other words, Xiao Yu believes that there is also the possibility of intelligent life among gaseous planets.
Xiao Yu does not expect to achieve results in a short period of time. This is a new round of needle hunting in the haystack. It takes Xiao Yu's great energy and patience to gain something.
"This star is good, of moderate size and age. The planet turned out to be a rocky planet of 1.6 times the mass of the earth ... Well, it's worth a look." In the long journey, the probe returned a The message caught Xiao Yu's attention.
Prior to this, Xiao Yu had searched for at least five hundred galaxies, but each time the ending was disappointing. The terrain, geology, and other conditions of various planets are strange, not to mention intelligent civilization, not even the first-level creature Xiao Yu.
Some of these planets are very close to their main star, and they are constantly roasted by the star's flame. Under their own rotation, they are like roast ducks in the oven, for fear that they will not be roasted thoroughly. Some planets are directly locked by the gravitational pull of the stars, and their rotation and revolution cycles are synchronized. They always face the stars on the same side, like Mercury in the solar system. One side is fiery and the other is ice hell.
Some planets are too chaotic ~ EbookFREE.me ~ They are not protected by massive gaseous planets, nor are they buffered by the atmosphere. They are constantly bombarded by uninterrupted interstellar cannonballs, resulting in pots and pans above their shells. There are craters everywhere, just like the moon. Some are too far away from the stars, and the entire planet is like an oversized ice cellar ...
With different planets, Xiao Yu opened his eyes and felt a deep disappointment.
"It turns out that in this universe, dead silence is the norm, and life is the exception. According to the calculation of one eligible star out of every hundred stars, I have detected more than five hundred stars, which means that Now, 50,000 stars have been ruled out, 50,000 stars, no life planet ... "
"Life is such a magical existence." Xiao Yu sighed deeply.
Through this search, Xiao Yu once again felt the looming conspiratorial hand behind him. The reason is very simple. Since the existence of life is so scarce and intelligent life is nothing, then what has happened to the many civilizations that I have encountered since I left the earth? Why are you so unlucky, or that you are so ... lucky?
Xiao Yu didn't know what it meant.
"That's the same sentence, do yourself well, and then talk about the rest." Xiao Yu sighed secretly, "I hope this time the target is detected, don't let me down."
Xiao Yu once again changed the course of his fleet and sailed towards this star system. Hundreds of billions of kilometers behind, the fourth-level alien beast still looked like Xiao Yu, who couldn't get rid of it.