Lu Yu, who had been looking up at the starry sky on an alien planet, thinking that maybe one day he would meet a human in the starry sky, also received the news that the human deep space fleet had crossed the heliosphere.

This is still the first time that Lan Xing transferred it to Lu Yu in the Endless Starry Sky as soon as he received the news, otherwise he would have to wait a few more days if he wanted to know the news.

The long distance in space makes the communication at the speed of light seem so slow.

Humans will find that the more they explore the depths of the universe, the more difficult it is to communicate.

However, for the time being, there is no need to develop faster-than-light communication technology to keep communication open. So far, the farthest planet humans have ever visited is the Moon, which is about 384,400 kilometers away from Earth. At the speed of light, it takes 1.3 seconds to cover this distance.

It's like talking to someone on the other side of the world, there's a little delay, but it's not a big deal.

But with the colonization of Mars, then the problem arises. The average distance between Mars and Earth is 225 million kilometers, and it takes 12.5 minutes to cover this distance at the speed of light.

And the deeper you go into space, the more difficult it becomes.

Voyager 1 has already reached the outer space of the solar system, 19.5 billion kilometers from Earth. However, we can still receive messages from there, but it takes 18 hours for each message to arrive.

The star α Centauri, about 40 trillion kilometers away, is the closest star system to Earth.

Communication with the star system is difficult, with each message taking up to four years to arrive. As a result, communication at the speed of light becomes ineffective.

Faster-than-light communication will show its necessary value with the expansion of the star field controlled by civilization, and then a large amount of civilization resources will be invested in research.

According to the civilization technology that Lu Yu is now exposed to, wormhole technology is naturally one of them, but it involves space technology, which is too difficult to implement and is not considered at this stage.

Tachyon, a mysterious special substance, is a great hope for a breakthrough. However, there are too few scientific and tech-related research in human beings, and the progress is slow, and I don't know how many years of preparation it will take to break through the application stage.

And the most promising is the technology of quantum entanglement for communication, and the related scientific and technological creation is the Zhizi computer that Lu Yu once captured.

It was also created by a fifth-level stellar civilization, but with the fact that human beings have not even been able to figure out the technological tree of a stellar civilization, if they want to reach the pinnacle of a fifth-level civilization, they also need to embark on a long road of scientific and technological development.

But these are all later words, when the human race took another step to defend its home planet, Lu Yu was still waiting in the light bridge for the strange unknown civilization to return.

"This unknown civilization can't communicate within civilization using the speed of light, right?"

"Or does it think the Silver Star is ready to eat in the Bridge of Light?"

Lu Yu was in the lake in the living area, the mirror-like lake reflected the sun in the sky, the temperature of the sun lamp was as intoxicating as an autumn afternoon, and he and No. 7 were drifting with the waves in a small boat like a leaf.

Of course, the waves are only generated by the will of the Seven, so that they can enjoy their leisure time more comfortably this afternoon

"In our original plan, this was going to be a sea, right?"

"The well-equipped undersea machinery can create an effect similar to the high tide and low tide, and with the cooperation of the atmospheric circulation system, there will be waves in the sea here, whether you want to surf, boat, or enjoy the wildness of the sea, you can feel it here."

No. 7 stroked Lu Yu's head and said with a smile: "At that time, you also said that you would enable some chaotic algorithms for the weather cycle system and the submarine mechanical system, that is, at a certain time, what kind of scenario will appear in a certain location above the sea, we can't accurately predict it." ”

"This means that at some point, there may be a typhoon, a tornado, an earthquake, a tsunami, and so on. This is a complete simulation of nature, and the magic and vastness of nature will be most perfectly interpreted here. ”

"As a result, the experts at Base Zero were scared to delete the database and run away overnight, for fear that you would really come up with such a system, just in case, just in case, if there was a situation that would hurt you, they would probably have to be accused of being against humanity afterwards, right?"

After all, Lu Yu was born on the planet, and he still retains an instinctive fascination with the natural scenery on the planet. Being able to recreate the wild scenery of the planet in the living area is undoubtedly a huge attraction.

But the experts at Base Zero didn't think so, for fear that Lu Yu would be hurt in any way.

Obviously, with the help of intelligent robots, the disasters on these planets can be easily overcome, but in the end, Lu Yu was not able to stuff a sea into his living area, and could only replace it with an endless blue lake in front of him.

Lu Yu pillowed on No. 7's lap, while closing his eyes and enjoying the gentle touch, he said regretfully: "At that time, the plan of the sea was rejected, so I thought about adding a mountain range to my yard. ”

"With the help of the atmospheric circulatory system, the water vapor from the sea will turn into snow and fall on the top of the mountains, and the heat of the virtual sun will melt them, so that they will become water and then flow down, and this water will become waterfalls, and rivers will become waterfalls, and it will irrigate the plants that live on these mountains."

"Well, there's a mountain at home, isn't it much cooler than having a swimming pool!"

When planning the living area a long time ago, Lu Yu was still a newcomer to the starry sky who had just passed the survival stage, and now although he is still wandering around in the big universe, he is no longer alone.

In good times, there are always some strange things to encounter.

Lu Yu was still enjoying going with the flow, and No. 7 stopped his movements and said softly: "The unknown civilization has recovered." ”

Lu Yu opened one eye and muttered, "Ignore it first!" ”

Turning over and hugging Seven's thigh, he changed to a more comfortable position and spent this leisure time first.

You've made Lao Tzu wait for almost three months, and I can't leave you for a few days?

With such a slightly angry thought, when Lu Yu saw the information of the unknown civilization, it was already a few hours after dinner.

[A powerful unknown civilization, the technology of your spaceship amazes us. 】

[We believe that you already have the ability to know the truth of this universe, please move to another galaxy and talk to us.] 】

Ha?

The moment Lu Yu finished reading this information, he felt that this unknown civilization was probably also a problem with the thinking circuit.

[Background Story +1%]

Well......... However, at the same time, the system prompt made him understand that he was one step closer to earning points.

Forget it, points matter!

After repairing the Silver Star, where can the universe go?

Thinking like this, Lu Yu turned on the holographic projection and saw that the light bridge in front of the Silver Star had become a door to space.

Even if you haven't crossed the past, you can detect it many light-years away.

This is an extreme binary star system, with a white dwarf star and a neutron star dominating the galaxy. The distance between them has been reduced to less than a million kilometers. At such a distance, the speed of these two extreme stars has reached a terrifying level.

The diameter of this white dwarf star is nearly 10,000 kilometers, which is not much smaller than that of the Earth, while the diameter of this neutron star is only 20 kilometers.

There is such a disparity in size between the two, but in this gravitational battle, it is undoubtedly the neutron star that dominates.

Neutron stars and white dwarfs have very smooth surfaces due to their strong gravitational pull, with little undulation.

But at such a close distance, the terrible gravitational pull broke this smooth surface, and this white dwarf, attracted by the huge gravitational attraction of the neutron star, has become an oval, and the side facing the neutron star is attracted to protrude forward, and the same is true of this neutron star, and the side facing the white dwarf star is also attracted to appear like a small mountain.

The strong gravitational pull also caused changes in the internal structure of these two extreme stars. In the continuous deformation, squeezing, and friction of the star matter, powerful energy is released, and the brightness of this white dwarf star is further increased, and at this moment, it is not inferior even to a real star.

Because of this, Lu Yu was able to observe this extreme celestial system at the gate of space on the other side.

This is not a blessed land of civilization, but a forbidden area for life.

Because the brightness of the white dwarf is an extremely dangerous and terrible thing, it is already the end of the star, but at this moment it flashes the brilliance of the star, which means that the critical reaction is about to occur - Gamma ray burst!

It is the strongest explosion in the known universe and is theoretically the result of a massive star collapsing and exploding when it runs out of fuel, or by the merger of two adjacent compact stars (black holes or neutron stars). Gamma ray bursts can be as short as a thousandth of a second or as long as hours, releasing enormous amounts of energy in a short period of time. If compared to the Sun, it releases energy in a matter of minutes equivalent to trillions of years of sunlight, and the energy of a single photon it emits is often hundreds of thousands of times that of typical sunlight.

But the Gamma ray burst doesn't just erupt in one go, behind it, there is also an X-ray afterglow and a visible afterglow. This is due to a decrease in energy levels. In other words, after the Gamma rays are completed, X-rays and visible light are emitted. X-ray bursts can last for a few weeks, while visible light bursts can generally last for more than a year.

In such an environment, not to mention what would happen if there was a planet in the system, even if such an unlucky planet existed a light year away, it would be destroyed by the imminent outbreak of Gamma ray bursts.

Because of the high energy level of Gamma rays, they carry very large amounts of energy, especially the Gamma-ray bursts that erupt when neutron stars collide with white dwarfs.

Under the irradiation of the Gamma ray burst, in just a few seconds, the structure of the atmosphere of the unlucky planet, if it had an atmosphere, was completely changed, and the atmosphere that was countless times more active would spill into space with a large amount of gas.

Because it is extremely penetrating, it can have an impact not only on the surface of the planet, but also on the interior of the planet. Some elements in the interior of the planet will produce some specific reactions when irradiated by extremely high-energy Gamma ray bursts. The Gamma ray burst, which only lasted for a few seconds, seemed to be recharged for the planet in an instant, and it was immediately active when it was full of energy.

Extremely high-intensity volcanic eruptions and large-scale earthquakes have completely changed the geomorphological structure of the planet. At its poles, a brilliant aurora was produced, like a silver snake waving in the sky, showing its posture in the night sky, and under the illumination of the aurora, the world was turned upside down above the surface. If it were the Blue Star here, all the creatures above the Blue Star would have died in this instant.

The cause of the death of organisms is not geological changes such as volcanic earthquakes, but the genes of organisms that will be directly destroyed by Gamma ray bursts, and under the irradiation of this energy level Gamma ray bursts, blue star organisms will die of cancer before they have time to die, because the structure of proteins in the body will be destroyed in an instant, and deterioration, and then life activities will be forcibly suspended.

Therefore, every planet that can stably give birth to life is not necessarily a cosmic miracle, because in the billions of years that have supported the evolution of life, there has not been such a terrible interstellar catastrophe.

But these are not the focus of Lu Yu's attention, after all, this kind of extra-large interstellar is nothing new to him.

If there is a mega interstellar catastrophe that will interest him, it would be to try a whole piece of two-way foil in the central black hole.

Let's see if the gravitational pull of the central black hole, which can distort space-time, can withstand the dimensionality reduction attack.

But such an experiment will undoubtedly plague the entire huge galaxy, and I don't know how many civilizations and how many kinds of life will be extinct because of this, and Lu Yu will not be more or less to the point of amusing all living beings.

But then again, for an unknown civilization, it is very likely that it is a ninth-level civilization.

Why did you plan to invite the Silver Star to this star field?

What topics can't be talked about in the Light Bridge?

I think it's good here, too!

Lu Yu looked at the triangular spaceship that was still guarding outside the light bridge, and couldn't help but take a closer look at the other side of the space gate.

And when I looked at it this way, I really made a new discovery.

Because ........ in this extreme binary star system, judging from the feedback of the observation data of Seven, there is actually a planet.

It is 1.5 times larger than the Earth and has its own atmosphere.

It stands to reason that such a rocky planet should have been torn apart and swallowed by the terrible binary star system a long time ago, and it would not have survived.

But it is indeed such a binary system, orbiting in strange orbits.

And this is not the thing that surprised Lu Yu the most, after all, with the power of civilization, it is not difficult to keep this planet.

Think about it, when the Ring Clan of the Eighth-level civilization built a space transit station at the cosmic node, they used the configuration of massive stars, white dwarfs, and neutron stars to achieve a stable gravitational field.

The twin stars in front of me are a small scene.

To Lu Yu's surprise, the purpose of the unknown civilization to invite the Silver Star to go was to be located on this planet, and judging from the data he fed back on the planet, it seemed that there was still life on it!?