Super Battleship Reborn

Life may have different forms, and their requirements for the environment are also different. For one kind of creature, the environment of hell may be heaven for another kind of creature. For example, before leaving the earth, how could Xiao Yu have thought that there are creatures like black worms on Titan?

Until now, there are still some specimens of black worms on Xiao Yu's spaceship. Analyzing from the current point of view, Xiao Yu believes that these black worms should also be classified as alien creatures, not ordinary creatures.

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. It is obviously unrealistic to detect all the 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. And Xiao Yu didn't think that his luck could be so good that he could find intelligent creatures within 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 within the range of 3,000 light years is an astronomical number. If every star has to be detected at close range, even if the time of 2,000 years is extended by ten times, it will not be enough.

In order to deal with this situation, Xiao Yu called all the scientists under his command and had many discussions.

First of all, I think 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 inside the organism must be in a liquid state. Matter is the carrier.

A scientist offers his opinion.

No, I don't agree with this. Another scientist objected, saying: Although our more than a hundred races all use liquid matter as the carrier for energy exchange in the body, why in this universe? Why can't there be organisms that use gaseous substances as carriers for energy exchange? After all, theoretically speaking, gaseous substances can also do this.

The scientist's speech caused a lot of discussion.

This point is in doubt for the time being. We can't prove or deny it, so let's move on to the next discussion. It's also about material exchange. I think that a suitable planet for life must have a liquid core, and only a liquid core can Only when there is geological activity can there be orogeny, and then there must be a large enough satellite to generate tidal force 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 more. As long as a planet has an atmosphere, it has enough value. Under the light of the star, the imbalance of atmospheric temperature will cause the atmosphere Flows, the exchange of matter brought about by these flows is enough.

Another scientist offered his opinion.

No, it doesn't necessarily need to be like this. Why must the atmosphere flow and matter exchange? Can planets without atmospheres not be able to evolve life? I don't agree with this. I think this limitation can be removed.

…………

This kind of discussion activity lasted for two full months. Xiao Yu relaxed the restrictions time and time again, combined with the environments that these more than a hundred kinds of creatures require and the conditions of their home galaxies, and finally came to the following A few conclusions.

Xiao Yu believes that these conclusions should be universal, at least in the Milky Way. In other words, as long as there are planets with intelligent creatures, the following conditions will generally be met. There are bound to be exceptions,

But the quantity will not be too much and can be ignored. In the future search process, I will use these points as a guide to start actions.

First of all, in order for a biological star system to exist, its main star must be stable and able to export energy steadily and continuously. This ruled out all the stars that fell into the twilight and infancy. Because the young star activity 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 germ of a life. In the nascent star system, this level of impact can only be regarded as trivial. Older stars will become red giants, and the stellar activity will be more intense.

Second, its lifespan must be long enough. Because only the life of the host star is long enough, it can provide enough time for the slow evolution of organisms. This point ruled out all the superstars again.

Because the mass and life of a star are inversely proportional, the greater the mass, the shorter the life. A star with a mass dozens of times that of the sun may have a lifetime of only a few million years or even less. On cosmic scales, such a short period of time is just a fleeting moment. Such a short period of time is obviously not enough to evolve intelligent creatures.

Thirdly, living things should all appear and evolve on planets. Although Xiao Yu couldn't rule out the possibility that there is life on stars, this possibility is too small to be ignored. This ruled out all star systems without planets.

The remaining points, for example, a living planet must have a large enough satellite to slow down its rotation, and at the same time create tidal force to form material exchange, and for example, the outer layer of a living planet must have a large enough gaseous planet to provide protection for it, and Or the distance from the star must be suitable, and conditions such as liquid water must exist on it, because it cannot 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, then it has the value of allowing itself to be close to detection.

The current state, age, mass, lifespan, etc. of stars can be analyzed by means of restoring light, and whether there are planets can be determined by swinging and occulting methods. There is no distance limit or a greatly increased detection range for detection by light. Xiao Yu can perform these detections on any star system within 20 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 for close-range detection. If the detection results show that there is an intelligent civilization alive, the fleet will depart from superluminal voyage and stay here. If there is no sign of intelligent civilization alive, it will continue to detect the next planet.

Under such loose conditions, the number of star systems that meet the conditions has greatly increased. Basically, one out of every hundred stars meets the conditions. Massive stars and aging, young stars are only a few after all, and the existence of planets 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 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 doesn't expect to get results in a short period of time for this work. This is a new round of finding a needle in a haystack, and it requires Xiao Yu's great energy and patience before he can gain anything.

This star is not bad, with a moderate size and age, and the planet is actually a rocky planet with a mass 1.6 times that of the Earth...Well, it is worth visiting. During the long journey, a piece of information returned by the probe The message caught Xiao Yu's attention.

Prior to this, Xiao Yu had searched for at least 500 star systems, but every time he ended up disappointed. The topography and geology of various planets are all kinds of strange things, not to mention intelligent and civilized creatures, not even Xiao Yu, the most primitive creature.

Some of these planets are extremely close to their main star, and they are constantly being roasted by the flames of the star. Under their own rotation, they are like roast ducks in an oven, and they are afraid that they are not thoroughly roasted. Some planets are directly locked by the star's gravitational force, and their rotation and revolution are synchronized. They always face the star with the same side, just like Mercury in the solar system. One side is a hell of fire, and the other side is a hell of ice.

Some planets are too chaotic, without the protection of large-mass gaseous planets, and without the buffer of the atmosphere, they are constantly bombarded by interstellar shells, resulting in pits and craters everywhere on their outer shells. It's like the moon. Some are too far away from the stars, the whole planet is like an oversized ice cellar...

The various planets opened Xiao Yu's eyes, but at the same time he felt a deep disappointment.

It turns out that in this universe, death and silence are the norm, and life is the exception. Calculated based on the fact that there is one qualified star in every hundred stars, I have detected more than five hundred stars, which means So, 50,000 stars have been eliminated, 50,000 stars, not a single living planet...

Life, what a magical existence it is. Xiao Yu sighed deeply in his heart.

Through this search, Xiao Yu once again felt the looming hand of conspiracy behind him. The reason is very simple. Since the existence of life is so rare, and intelligent life is even rarer, then, what is going on with the many civilizations I have encountered one after another since I left the earth? Why is he so unlucky, or rather, he is so... lucky?

Xiao Yu didn't know what this meant.

It's still the same sentence, be yourself first, and then talk about the rest. Xiao Yu secretly sighed, 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 away, the fourth-level beast, still loomingly following Xiao Yu like a brown candy that cannot be shaken off.