In 1916, the German astronomer Carl Schwarzschild calculated a vacuum solution to Einstein's gravitational field equation, which showed that if a large amount of matter was concentrated in a point in space, a strange phenomenon would occur around it, that is, there was an interface around the particle point - once the "event horizon" entered this interface, even light could not escape. Pen, fun, and www.biquge.info

This "incredible celestial body" was named a "black hole" by the American physicist John Archibald Wheeler.

A black hole is a singularity with infinite density, infinite curvature and infinitely small volume in the center and a part of the surrounding empty celestial region, which is not visible within the scope of this celestial region. According to Einstein's theory of relativity, when a dying superstar collapses, it will gather into a point where it will become a black hole, swallowing up all light and any matter in the adjacent cosmic regions.

The creation of a black hole is similar to that of a neutron star, where a star is preparing to perish, and its core rapidly shrinks and collapses under the influence of its own gravity, resulting in a powerful explosion. When all the matter in the core turns into neutrons, the contraction process immediately stops, and it is compressed into a dense star, which also compresses the space and time inside.

But in the case of black holes, because the mass of the star's core is so large that the contraction process goes on endlessly, the neutrons themselves are crushed into powder by the attraction of the squeezing gravity itself, leaving behind a matter of unimaginably high density. The gravitational pull due to the high quality is such that any object that comes close to it will be sucked into it.

This is the most extreme celestial body known in the universe, and it is also what modern human astronomy has been trying to observe.

Compared to other celestial bodies, black holes are very special. It cannot be directly observed, and scientists can only speculate about its internal structure, and what makes black holes hide themselves is the curved space-time, which according to the general theory of relativity, bends under the gravitational field. At this point, the light is still traveling along the shortest path between any two points, but it is relatively bent. When passing through a dense celestial body, space-time will bend and the light will deviate from its original direction.

On Earth, the distortion of space-time is minimal due to the small effect of the gravitational field. Around the black hole, this distortion of space-time is very large, so that even the light emitted by the stars blocked by the black hole, although some of it will fall into the black hole and disappear, but the other part of the light will bypass the black hole in the curved space-time and reach the observer's eyes, and observe the starry sky behind the black hole, as if the black hole does not exist, which is the "stealth" of the black hole......

Moreover, the black hole does not emit any matter other than Hawking radiation by definition, which means that it will not appear under any wave detection, and the gravitational waves and electromagnetic waves emitted by Noah before will no longer be connected to the outside world after entering the black hole event horizon, so Noah has not received any detection feedback.

But the white dove, which was pulled into an infinitely thin straight line by the gravitational pull of the black hole, fed back the last information before it lost contact.

The remaining 100 white doves began to rush towards the coordinates of the black hole, and with the feedback data of the white pigeon that had been sucked into the black hole, Noah had preliminarily solved the strong gravitational range of this black hole, and also marked the location of this black hole in the empty model of the solar system.

Noah's body was still trembling, in the girl's hands, a small "black hole" appeared there, it was quietly suspended, all the surrounding light that broke into the black hole's event horizon disappeared, and the light that passed by the edge of the horizon was also focused under the action of gravity, making the scene around this "black hole" distorted, observing this small black hole, you can see the scene covered by the black hole in the distorted light, but Noah deliberately lowered the effect of the black hole's "stealth", so that the black hole model can be revealed.

This is a black that is countless times purer than obsidian, black without any light leaking, like a hole in space, completely separated from the material universe.

The girl held the black hole on her face and rubbed it, as if a child had gotten the toy she wanted the most, and her dark blue starry eyes were full of brilliance.

Noah was very happy that the location of this black hole was so perfect, it was in a border galaxy like the Solar System, far from the center of the Milky Way, which meant that it would not have gravitational interaction with other extreme stars, and since it had swallowed the mass of the entire solar system, it would not evaporate due to Hawking radiation in a short period of time. This is a new black hole that can exist stably for millions of years!

And such a black hole for a child who is not as old as Noah is held in the hands of the girl as a baby at this moment.

This black hole is so precious that it will open a new door for Noah, a door that humans will never have the chance to touch, and what will be hidden behind this door, Noah doesn't know, but Noah is looking forward to it.

At this moment, Noah really wants to send all the fleets to the solar system, guard it forever, and declare the sovereignty of this black hole.

This black hole is like it was specially prepared for Noah.

But is what is too easy to get really something that should be obtained?

After the surprise, the girl who slowly calmed down began to have a complicated look in her eyes.

If a stable black hole is found in any other situation, Noah will not hesitate to possess it, but this black hole is quite strange, it appeared in the solar system, and completely erased the solar system and the Kara civilization originally here in the universe, which made Noah have to think about the safety of this black hole......

Perhaps, this black hole is not a natural black hole at all, but a weapon of a certain high-level civilization, which temporarily stayed here after destroying the solar system and the Kara civilization.

The girl who gradually calmed down flashed such thoughts, and such thoughts made the girl shudder, using a black hole as a weapon, what kind of exaggerated means is this?

With the existing theoretical system, if he didn't borrow the entropy increasing weapon, Noah couldn't think of how to resist the black hole attack, because as long as he fell into the black hole horizon, in the curvature space-time locked by gravity, the curvature navigation and micro-wormhole transportation through the curvature of space-time would be meaningless, and there would be no possibility of escape.

This is a far more terrifying means of striking than the Particle Strike, completely erasing civilizations and galaxies from the universe.

A star of the size of the Sun is unlikely to form even a small neutron star, let alone a black hole, and if you are lucky, the Sun could become a white dwarf......

Therefore, the source of this black hole will definitely not be the solar system, nor will it be the Kara civilization, because they cannot have the technology to create black holes.

Under the girl's complicated gaze, the small black hole in her hand still couldn't reveal a trace of light.

If this black hole is really the weapon of a certain high-level civilization, or this is the trace left by that high-level civilization after it attacked the solar system, this black hole is inextricably linked to an existence that Noah is far from being able to compete with now, is it really a right choice for Noah to occupy such a thing?

This feeling is like a little wild cat lurking in the grass in the dark forest, looking at a delicate fruit not far away with great longing, but this little wild cat doesn't know if the owner of this fruit will be angry because he stole the fruit......

And this kind of anger, the little wild cat can't afford it......

Several white doves have already arrived outside the strong gravitational zone of the black hole, flying around the black hole at nearly the speed of light, making a regular circular orbit. As long as they are accelerated to near the speed of light by conventional engines, they can get close to the black hole horizon and begin to observe the black hole horizon up close.

However, Noah did not dare to take that step, and the girl was afraid that in the next second, this quiet black hole would become an awakened terrifying beast, swallow all the white doves, and then kill the water committee 80 light years away.

In front of the civilization that can use the black hole as a weapon, Noah will not have the slightest possibility of escaping, the Kara civilization is a lesson from the past, Noah is afraid that he will become the next Kara, and he will be quiet in this dark forest forever.

Survival is the first element of civilization. 】

This "supreme command" that Noah set for himself came out again at this moment, waking the girl up from the struggle of thinking.

In a short period of time, Noah's eyes flashed with fear, joy, struggle, and disappointment...... In the end, only a deep sense of loss remained.

No matter how small the possibility is, as long as there is a 0.01% probability that "the earth's civilization will be destroyed", Noah will not be able to make that choice.

The little black hole in the girl's hand disappeared, and all the white doves began to return.

The returning white doves took an optical photo of the direction of the black hole in the distance, although it was a blank photo that could not be seen at all, but it was also a memento of Noah's trip.

For the first time in the history of the earth's civilization, a close-up observation of a black hole came to a quick and brief end.

100 white doves, turning into 100 thin golden lines in the dark solar system, escaped the strong gravitational zone of the black hole and extended beyond the galaxy.

The girl in the main control room leaned on the projection screen a little lost, although this choice made the girl's mood index lower to the extreme again, but the girl did not regret it. Noah didn't give up completely, if one day the girl had enough ability to protect herself, she would come back to see this black hole.

But before that, Noah has to make sure he survives.

The white dove's vision is still coming back, although only the empty and dark space remains, and it is also the last view of the solar system.

After the white doves don't know how far away from the black hole, in the white doves' field of vision, something discordant breaks in.

It was a drop of water, a drop of water with a soft halo, a drop of water that was so dazzling in the darkness and silence of space.

It swept through the darkness, leaving a perfect arc, and quickly accelerated to a speed higher than the normal limit speed of 0.7 times the speed of light in the galaxy of the white dove, and came to the front of the white doves, and at the moment of the collision, it suddenly accelerated in reverse without buffer as if it violated the laws of fundamental mechanics, and was relatively stationary with the white doves advancing at 0.7 times the speed of light.

Noah, who was still in the midst of loss, only looked at this sudden drop of water in a daze, the girl reacted within a microsecond and came up with tens of thousands of possibilities, and finally, the girl determined that this drop of water was a creation from an unknown high-level civilization.

This made Noah's logical thinking work to the extreme in an instant, and the nerves immediately tensed, and the white doves began to slow down.

But as the white doves slowed down, this rippling soft halo of water droplets also began to slow down, always remaining relatively stationary with the white doves.

Eventually, in the girl's starry eyes, which were a little stunned, it used the halo and wake to write a few words on the earth.

[Child, I will give you a star to protect yourself. (To be continued.) )