The village-level spaceship continued to accelerate, until it reached three times the speed of light before stopping.

Three times the speed of light is the highest speed that Xiao Yu can achieve at present.

Today, 50 years later, the radius of the four-dimensional barrier has shrunk from 10 billion kilometers to 7.5 billion kilometers. This means that from the center of the galaxy, at the speed of this village-level spacecraft, it will only take two and a half hours to cover this long distance.

The curvature drive method is not the same as conventional sailing, the biggest difference is that conventional sailing can be navigated by inertia after the initial acceleration phase, which can save a lot of fuel. But in curvature drive, since the motion of the spacecraft is zero, there is naturally no inertia, and it cannot rely on inertia to navigate. This means that the elemental decay engine must be in motion all the time to provide energy to the curvature engine during the voyage.

This results in the energy consumption of curvature navigation is much higher than that of conventional navigation, and if there is no elemental decay jishu, curvature navigation is simply a flower in the water and cannot be realized.

There are advantages and disadvantages to this feature. The disadvantage is of course excessive energy consumption, and the benefit is a leap in mobility.

A spacecraft traveling in curvature can accelerate from a standstill to the speed of light in less than 10 seconds, or from the speed of light to a stationary state within 10 seconds.

To put it in a less accurate way, the maneuverability of Xiao Yu's spacecraft has increased by tens of thousands of times compared to the past.

An hour later, the ship was driven by curvature and reached the edge of the four-dimensional barrier.

After entering the faster-than-light phase, the matter will disappear in the full wavelength band, whether it is visible, ultraviolet or infrared. After Xiao Yu's research. Xiao Yu believes that this is because the redshift is too violent, causing the light to move out of the detectable frequency. But by detecting the degree of spatial distortion, Xiao Yu can accurately locate it.

Similarly, in faster-than-light travel, all light from the outside world is completely invisible because the blue shift is too violent.

In other words, in faster-than-light travel, this spaceship is completely isolated from the outside world.

This poses a certain danger to faster-than-light travel. Because during the voyage, the spacecraft cannot detect whether there will be obstacles ahead, and it is better to sail short distances, but if you sail long distances, it is likely to cause accidental collisions. For example, crashing headfirst into a star or planet.

In fact, it is not that a spacecraft traveling faster than light cannot receive or emit light. It's just that the redshift or blueshift is too drastic. As a result, this type of light is not detected. In this regard, Xiao Yu is already conducting research, trying to develop an instrument that can restore the frequency of light, allow himself to travel faster than the speed of light, and can also detect external intelligence.

But at this stage, such an instrument has not been successfully developed. It also requires Xiao Yu to continue to conduct uninterrupted research and spend some effort to develop it.

After this spaceship arrived near the four-dimensional barrier, all of Xiao Yu's attention was placed here.

Because I don't know the characteristics of the four-dimensional barrier. Xiao Yu didn't know how to break through this barrier. But in Xiao Yu's speculation, faster-than-light travel is likely to break through. Now, it's time to test whether Xiao Yu's conjecture is correct.

"The collision will happen in five seconds. Five, four, three, two, one......"

In the field of view of the Space Distortion Detector, the village-level spacecraft suddenly disappeared.

"Was the breakthrough successful?" Xiao Yu thought a little nervously, and immediately commanded the village-level spacecraft to break away from the faster-than-light voyage through super-distance communication, and immediately began to use the instruments on the spacecraft to start detecting the external environment.

As far as the eye can see, it is nothing, nothing.

"Where is this?" Xiao Yu thought a little dazedly, "Could it be that traveling faster than the speed of light will break through to other spaces?" That's a bit of. ”

Xiao Yu manipulated the village-level spaceship to continue to explore, and then, in the background of space, the pale red barrier attracted Xiao Yu's attention.

It was an extremely large red barrier that took up the entire field of view of the probe.

Xiao Yu's heart gradually sank to the bottom.

The detection instrument of the village-level spacecraft turned around, and sure enough, it detected this huge red giant. After the village-level spacecraft emitted a burst of radio waves, the satellites scattered throughout the galaxy quickly set its position with the help of this array of signals.

As a result, the faster-than-light spaceship still hasn't broken through the red barrier. Like the rest of the spacecraft, it was randomly teleported to a point between a billion and 1.1 billion kilometers from the central star upon contact with the barrier.

Experiments have proved that traveling faster than the speed of light cannot break through the four-dimensional barrier.

"I should have thought a long time ago, in the face of a four-dimensional barrier, faster-than-light travel is not possible." Xiao Yu muttered to himself, "If you can break through the four-dimensional barrier just by traveling faster than light, then the four-dimensional maintenance cover will have no use value. After all, the fourth-level civilization that has mastered faster-than-light navigation jishu may not be able to develop faster-than-light kinetic weapons, and if it can't even defend against faster-than-light speed, the value of the four-dimensional maintenance shield is not as great as the value of the force field shield. ”

"So, how can we break through the four-dimensional barrier?"

Xiao Yu fell into a daze.

Elemental decay, and faster-than-light travel, is the biggest breakthrough Xiao Yu has made in the past few hundred years. Moreover, it can be Yujian, in the next few hundred or even thousands of years, it is impossible for Xiao Yu to make the rest of the major jishu breakthroughs.

"If Taihao is kind to me, then it is impossible for it to create a barrier that cannot be broken through with the technological level of a fourth-level civilization. In other words, under the premise that Taihao is kind to me, the technology that breaks through the four-dimensional barrier must be in the scientific and technological system of the fourth-level civilization. But if it's not even faster-than-light, what could it be? After all, traveling faster than light is the most significant feature of a fourth-level civilization. ”

Xiao Yu thought slowly, "Perhaps, it will be an elemental decay bomb?" Or a ray of disintegration of matter? Or is it a massive bombardment of faster-than-light kinetic weapons? ”

At this moment, Xiao Yu felt that he had suddenly lost the direction of his struggle.

It is impossible to break through to a fifth-level civilization in a short period of time. Not only that, but in the remaining less than one hundred and fifty years, it is impossible to make another major breakthrough in Jishu. Then Xiao Yu can only rely on the technology he currently has to try to break through the four-dimensional barrier.

But...... If you can't break through traveling faster than light, what kind of technology will it be?

Xiao Yu thought a little confused, "This can only be slowly shiyan in the future." Hopefully, I can find a way to break through in 150 years. ”

The radius of the four-dimensional barrier has been shrinking. This is equivalent to a rope around Xiao Yu's neck. When, when this rope is tightened to the point where Xiao Yu can't breathe, it will be when Xiao Yu perishes.

But Xiao Yu soon found out that he was wrong again.

Xiao Yu had been ignoring a question before.

By chance, a spaceship's temperature detector discovered that the temperature in interstellar space was constantly rising.

Before the advent of the four-dimensional barrier, there were two billion kilometers from the central star in this star system, and the temperature was 137 degrees. At a distance of 7 billion kilometers from the central star, the temperature is minus 185 degrees.

The temperature mentioned here is not a simple physical quantity, but a temperature that can be measured in real terms.

But now, this temperature has changed. Xiao Yu saw that in his position, the temperature had risen from 137 degrees to 145 degrees unconsciously, and at a distance of 7 billion kilometers from the central star, the temperature had risen to minus 150 degrees.

This means that within the four-dimensional barrier, the temperature of the entire galaxy is constantly rising.

Xiao Yu quickly found the reason.

"I see...... Because of the existence of the four-dimensional barrier, the heat of this star cannot radiate out, but can only accumulate in the galaxy, which will naturally lead to a continuous increase in temperature. ”

After coming to this conclusion, Xiao Yu began to care about another issue. That is, how fast is the temperature rising? When will it rise to a level that you can't afford to bear?

For this question, Xiao Yu quickly found the answer through calculations.

The conclusion is that the temperature will rise faster and faster, and in fifteen years, the lowest temperature in the galaxy will be more than 3,000 degrees, no matter how far away from the star. And Xiao Yu's spaceship, in such a temperature, will have to consume more energy to resist the high temperature.

This star system within the four-dimensional barrier will become a veritable steamer. Xiao Yu's spaceship is a steamed bun that is constantly steamed in a steamer.

"Fifteen years from now, in the face of rising temperatures, I will have to use up all of my energy reserves and have to dismantle the rest of the ships to fuel the elemental decay engines."

"But even then, I won't be able to hold on for long. The increase in temperature will only make the energy consumption more and more, so if you calculate it...... After the temperature reaches more than 3,000 degrees, I still have five years to go. ”

"If I can't break through the four-dimensional barrier all the time, at the Zuihou moment, after dismantling all the remaining spaceships, I will have to dismantle the equipment inside the Hebei to obtain energy ......"

"If you calculate it comprehensively, my time is not 150 years, not 100 years, but only 20 years...... In twenty years, I must find a way to break through the four-dimensional barrier, or I will die ......" (to be continued......

PS: The first update is delivered, and I ask for a guaranteed monthly pass~