metaverse evolution.

Chapter 922 Planets in the Gravitational String

Inside the spaceship, Quetzalcoatl acted as the atmosphere group, running around inside the spaceship, adding a lot of liveliness.

Chu Fei's several 14.9 advanced clones each have their own duties.

Some were responsible for supervising the safety of the route, some were responsible for calculating the route, and some were responsible for monitoring the spacecraft; while Chu Fei's main body was responsible for cultivation. The value of the clone was squeezed to the extreme by Chu Fei.

Among the many clones, the ones responsible for the flight routes are the most numerous.

What Chu Fei is using now is the naturally formed gravity string, which has not been artificially combed. Such gravity strings are full of dangers, just like reefs in natural waterways.

In addition to the debris within the gravitational string, there is also the gravitational string itself.

The straight-line distance from the Shenlong Galaxy to the Yunlong Galaxy is 83 light years, and the estimated flight distance is 90 light years. At such a long distance, Chu Fei has no way to explore the gravitational string conditions along the entire journey, that is, he has no way to directly locate the gravitational string from Shenlong Star to Yunlong Star.

The interstellar travel method adopted by Chu Fei is adjacent star positioning, which can be regarded as a segmented positioning.

From the Shenlong Galaxy to the Yunlong Galaxy, there are more than forty star galaxies of different sizes in between - they are not lined up in a straight line, but are randomly distributed up and down and left and right.

Chu Fei needs to choose an "excellent" route from them.

The greater the mass of the two stars and the closer the distance between them, the wider and more stable the gravitational string in between.

But for some red giants and blue giants, you have to be careful. The gravitational pull is too strong and the gravitational string is unstable - just like a wave turning into a tsunami.

But in the interstellar space, the distance between two massive stars is not necessarily close, and the conditions of nearby stars are not so perfect either.

Chu Fei is now heading towards a star 7 light years away, which is considered a "white star".

The colors of stars can be roughly divided into four levels: red, yellow, white, and blue. The smaller the size, the dimmer the light - reddish, and the larger the size, the brighter the light - blue.

The solar type belongs to the "yellow" range.

About ten times larger than the sun, it is in the "white" range. Any larger than that is a blue giant, which is unstable. Red giants belong to the late stage of stars and are even more unstable.

The stars selected for positioning in the interstellar space emitted their light many years ago. Who knows what the situation is now? Maybe in just a few years, a supernova explosion will occur. Although the possibility is very small, it is still possible.

Therefore, try not to choose blue giant stars for interstellar travel. Yellow and white main sequence stars are the main choices.

In addition, multiple star systems such as binary star systems and triple star systems are also unstable and must be avoided.

After such screening, Chu Fei finally chose only 12 star systems. The distance between these 12 star systems is 6 light years away from the closest one and more than 14 light years away from the farthest one.

The entire route is expected to present an irregular spiral zigzag line, with a total distance of more than 90 light years.

The spacecraft continued to accelerate and reached the first target galaxy in just 5 months - Chu Fei was still cautious and did not accelerate the spacecraft to the limit, but only maintained % of the theoretical limit speed.

Although hadronic materials are powerful, they are still mortal after all. Moreover, the hadronic materials currently available are all salvaged from stars and then processed. This is like digging up nugget gold from nature and processing it slightly. Such materials contain a lot of impurities.

After entering the galaxy, the spacecraft began to decelerate frantically, reducing its speed to 50 kilometers per second before it jumped out of the gravitational string.

You can't jump out of the gravitational string at superluminal speed, the real world doesn't support superluminal speed. If you insist on doing so, the spacecraft will be "smashed" into photons, and even the atomic nuclei will not be able to remain.

After the spacecraft jumped out of the gravitational string, it slightly adjusted its speed and then steadily hovered in the current star system. Chu Fei began to observe distant galaxies, looking for the next target.

The current galaxy is also being observed.

Right now, the galaxy is desolate. The white main sequence stars are already very violent. Solar storms and strong electromagnetic forces are constantly washing over the entire galaxy. Two of the rocky planets are bare, and the rest are gas planets.

Not finding anything good here, Chu Fei calculated the next gravitational string and then accelerated the spacecraft again, still using the stellar gravity to accelerate and drill into the gravitational string again.

Unconsciously, more than six months had passed, and Chu Fei once again emerged from a galaxy, another desolate galaxy. Practice has proven that there are only a few galaxies that are truly suitable for the existence of life, even galaxies that are suitable for transformation.

After rechecking the direction, Chu Fei frowned.

This place is 14 light years away from the next target galaxy, which is too far. After rigorous calculations, it was found that the gravitational string was not stable enough. According to Chu Fei's current formula, there is a possibility that the gravitational string will break in the middle.

If the gravitational string breaks outside the star system, the nearest star system is three to five light years away, and then it will be the end. A spacecraft flying in normal space will take 20 years to fly one light year, and three to five light years will take to years.

Although the current spacecraft is made of hadron materials, Chu Fei does not dare to say that the spacecraft can fly for such a long time intact.

Because the spacecraft is made of hadron materials, it cannot be repaired.

Chu Fei certainly had spare parts, but repairing a spacecraft was not an easy task.

After calculating for a while, Chu Fei sighed and realized that he didn't dare to gamble. So, he could only take a detour.

The telescope locked onto the surrounding starry sky to search for targets and found the "springboard". But in this case, the journey would probably be about five light years longer.

"Forget it. I'd rather take a detour than take a dangerous path."

After checking the direction, Chu Fei set out again. But this time, just halfway through the formation, Chu Fei found "traces of life" in the gravitational string!

To be precise, the spacecraft detected unique fluctuations in life energy, and they were very strong, with concentrations even exceeding the data from Venus.

For now, Chu Fei discovered that only with life energy can life be born. Life energy has a unique continuity, or a super-dimensional attribute.

So if life energy is suddenly detected here, there is a high probability that life will be born.

The life energy of the Venus star is very rich, and it is enough for practicing Taoism. This is due to the fact that the star in the Tenglong Galaxy is a white dwarf.

Now that the life energy here actually exceeds that of the Morning Star, Chu Fei became interested.

The place where life was discovered is in the middle of this gravitational string. At this time, the world outside the gravitational string is pitch black, and the nearest star is 2.2 light years away.

But here, the gravitational string expands, like a river entering a lake.

From a distance, Chu Fei discovered a planet.

Chu Fei became interested after discovering a "gravitational lake" inside the gravitational string, as well as planets and rich life energy.

There is still plenty of time, and since his cultivation level is high enough and he also has a clone, Chu Fei naturally wants to go and take a look.

The spacecraft began to slow down, but it was still too fast. After more than ten days of deceleration, the spacecraft passed the planet at 3.4 times the speed of light. Chu Fei could only continue to slow down and prepare to turn around.

But in the moment of passing by the planet, Chu Fei also detected a lot of information.

This is a "gas planet" with a diameter 2.5 times that of Jupiter - about 36 kilometers in diameter, a mass of about 16 Jupiters, and a surface temperature of 3 degrees Celsius.

There is a brown-red light on the surface of the planet, and the whole thing looks like a piece of charcoal buried in ashes, with a dim light.

After analysis, Chu Fei was somewhat surprised that this was actually a star, the legendary brown dwarf!

According to scientific theory, if the mass of a star reaches 13 times the mass of Jupiter, it is possible to cause nuclear fusion in the core of the planet and generate weak heat. This refers to mass, not diameter or volume.

This kind of star, which is just capable of nuclear fusion, has a very high core temperature, but a very low outer temperature. Theoretically, the outer layer of this star is very suitable for the existence of life.

This planet seems to meet this condition. The surface temperature is 3 degrees Celsius, and the temperature of nuclear fusion reaction must be at least 400 million degrees.

Outside the core, the temperature will drop sharply. After a simple calculation, Chu Fei believes that the temperature of this planet can be maintained below 16 degrees after 40 kilometers from the core until it reaches the surface of the planet.

In other words, preliminary estimates show that this planet has a life layer at an altitude of 20,000 kilometers! The volume of its living space is a million times that of the Earth!

A brown dwarf is equivalent to a million Earths. This is why the Yanhuang Federation has been searching for brown dwarfs and trying to create artificial brown dwarfs.

You know, the total number of life planets owned by the Yanhuang Federation at its peak was estimated to be in the millions.

So when Chu Fei saw the brown dwarf, he would definitely slow down and observe it. Even if it took three to five years, it would be worth it.

The spacecraft slowed down, then accelerated in the opposite direction, and slowed down again when it got close to the planet. In the end, it took Chu Fei four months to finally get close and circle around the current planet.

At this time, Chu Fei conducted a detailed investigation of the current planet:

直径约35.7万公里、15.89个木星质量、6.37倍地球标准重力，表面风速2.6~417米每秒；

The reason why the diameter is not accurate is that it is a gas planet at present, and there are differences of opinion in the scientific community about the definition of the surface of a gas planet.

Some people take the air layer corresponding to the standard atmospheric pressure of the earth as the surface; some people think that the air layer corresponding to the atmospheric pressure of the earth's stratosphere should be taken as the surface. Of course, some people take the state of near vacuum at an altitude of 80 kilometers as the surface.

Here Chu Fei chose the first measurement method, that is, taking the air layer corresponding to the standard atmospheric pressure as the surface. This definition has an advantage, it is more suitable for the thinking habits of earthlings and is easier to understand.

If calculated in this way, the "atmosphere" outside the surface of this planet is more than fifty kilometers.

The spacecraft orbits at an altitude of 106 kilometers above the "surface" at a speed of about kilometers per second.

Then Chu Fei opened the hatch from the back of the spacecraft and threw a probe to the planet. Well, there was no probe prepared on the spacecraft, but there was a space shuttle, which was used as an 'escape spacecraft'.

Now that they have encountered a brown dwarf, it is completely worth it for Chu Fei to use a space shuttle.

For unfamiliar planets, exploration is very necessary. Especially Chu Fei wants to make sure whether he can leave after entering this planet. This is related to the limit of the first cosmic speed.

The maximum injection speed of conventional chemical fuels is 10 kilometers per second, which means that if the orbital speed of a planet is greater than 10 kilometers per second, a spacecraft powered by chemical fuel will not be able to escape the planet and will be firmly bound to the surface of the planet by its own weight.

At present, the first cosmic velocity of this planet is far greater than that of the Earth. If chemical fuels are used, we are doomed to be unable to escape the planet.

Therefore, facing this planet with extremely strong gravity, Chu Fei did not dare to rush in directly. If he could not get out, he would be at a loss.

Although Chu Fei has explored the stars in the Tenglong Galaxy and even collected hadron materials from the stars, one must always be cautious when exploring super-large planets.

Not to mention that the wind speed on the surface of this planet is as high as 340 meters per second, which is higher than the standard speed of sound on Earth. It is still very dangerous.

Before entering, you must test it first. And there is also Chu Fei's clone in the aircraft.

However, the space shuttle launched by Chu Fei uses plasma engine technology as fuel, so in principle there is no major problem.

The aircraft slowly slowed down, and was then captured by the planet's gravity, gradually falling into the dark red planet below.

The entire surface of the planet is brown-red, and looks a little mottled due to the floating clouds.

As a brown dwarf, its light is transmitted from the ground to the sky. For the life on this planet, their "sun" is really underground.

This is a very strange world. As we continue to fall, the first thing we feel is the thick atmosphere.

The main components of the atmosphere are also being rapidly tested, with 15% oxygen, 26% nitrogen, and a carbon dioxide concentration of up to 53%. The rest are rare gases, inert gases, water vapor, etc., accounting for about 6%.

If you ignore the carbon dioxide content, this planet is suitable for human habitation - all we need to do is modify our lungs and increase the utilization of oxygen.

Ordinary people may be in danger when the oxygen content is lower than 19.5%. However, with training and auxiliary drugs, humans can withstand a minimum oxygen content of 10% for a short period of time.

Compared with sea level, the oxygen content of the same volume of air on the Qinghai-Tibet Plateau is only 65%, which is equivalent to 14% of the oxygen content under normal circumstances, or even lower.

Therefore, an oxygen content of 15% can theoretically support the life and movement of ordinary humans.

And the presence of a large amount of oxygen means the presence of plant-type life.

Oxygen is actually the waste gas of plants. A small amount of oxygen can be produced in nature, but because oxygen is active, it will undergo oxidation reactions with substances and be continuously consumed. If you want oxygen to continue to exist on a planet, there must be plants or similar life.

The spacecraft continued to descend, and when it reached 0.7 atmospheres, which is equivalent to the air pressure of the Qinghai-Tibet Plateau, it finally discovered life here. It was a floating plant that moved with the wind. Those "clouds" that looked like pieces from space were actually formed by this plant.

These plants are dark brown in color, with leaves facing the ground to absorb as much of the meager light as possible. A simple scan revealed that these plants grow very slowly.

But these plants also have their own way of survival. They store a lot of water in the "clouds" they condense, just like real clouds store water.

However, too much cloud will block the sunlight, and too little cloud will cause drought. So the way plants grow is to "divide".

The larger the area, the more clouds gather and the less light there is on each other. At this time, parts of the plants will die and decay, and finally break into small "lawns".

These plants also have air bags, but the aircraft does not have the conditions to test them, so it is probably hydrogen. The means by which plants produce hydrogen are actually very simple.

The aircraft continued to fall, and at a location with high atmospheric pressure, that is, the "ground location", it encountered an animal. This was a creature similar to a bat, but its big belly looked like an air bag, and its small wings were more like fish fins.

Then more creatures appeared, and a complete ecosystem emerged little by little.

However, there is no real ground here. As the aircraft continued to fall, Chu Fei also saw flying birds, swimming fish, jellyfish (balloons) and other creatures, some of which could reach more than ten kilometers in length.

Of course, there are also creatures without air bladders, which will rest on floating plants. Most of these creatures without air bladders are predators, with extremely fast speeds but insufficient durability.

As the aircraft continued to descend, the light gradually increased, and the ecosystem became more and more spectacular.

It was not until he fell to a pressure of 7 atmospheres that Chu Fei discovered traces of a building - it was not an animal shack, but a proper building, a rattan and wood structure with a "balloon" hanging above it.

Architecture is one of the symbols of intelligent life.

A perfectly constructed building not only means intelligent life, but also means the emergence of civilization.

The beginning of the Yanhuang "civilization" was the drilling of wood to make fire (Suirenshi) and Youchaoshi. Strictly speaking, before that, it cannot be called a civilization, but only a tribe.

Seeing the traces of civilization, Chu Fei's eyes lit up, but he did not stop immediately. Instead, he drove the aerospace plane and began to wander in this air layer.

[Spoiler: In such a huge world of life, what will happen if you leave behind a belief or heritage?] (End of this chapter)