Dark Matter Halo

Listening to the description of the Rhomboid Crystal, a feeling of vastness of the galaxy, one's own insignificance, the eternity of the universe, and the brevity of life arose in everyone's hearts.

They all listened quietly to its story.

"Perhaps this is difficult for life forms like you, who haven't even reached Level Six Civilization, to understand intuitively. How should I put it, um," the Rhomboid Crystal paused, and after a change in the warm, smooth feel of its crystal-like body, it continued, "Eh! Dark Matter Halo! Take back what I said earlier. It seems that your Human Civilization isn't completely ignorant about Dark Matter. At least some of your conjectures about Dark Matter are quite good."

"Dark Matter Halo?" Yue Yuan asked in confusion. He knew what Dark Matter Halo was, but he didn't know how the difficulties of the Great Voyage mentioned by the Rhomboid Crystal had anything to do with Dark Matter Halo.

The Rhomboid Crystal didn't directly answer Yue Yuan's question. Instead, it seemed to have seen something amazing and exclaimed with delight, "Oh, the classic NFW Distribution Dark Matter Halo density profile, the Cosmic Scale Density Formula, the formula for quantitatively describing the aggregation degree of Dark Matter Halo, and also the expression for the mass function of Dark Matter Halo in Random Field, the mass growth and assembly history of dark matter halos, the bias factor of Dark Matter Halo Dark Matter Subhalo -Dark Matter Halos!"

"Tsk tsk. You guys are really interesting! Although a lot of it is nonsense, I have to say you are really interesting. You know, back when we were at your level, our civilization hadn't even come up with the concept of Dark Matter, but you guys had it all in one era."

Dark Matter Halo.

In human scientific literature, they are the basic building blocks of the large-scale structure of the universe. Dark Matter Halo are generally located on the filamentary large-scale structure of the universe or on its nodes, and some are located in the void regions with lower density.

The galaxies observed by humans are often formed within these filamentary Dark Matter Halo. Most galaxies are embedded in Dark Matter Halo, and the dynamics of galaxy systems like the Milky Way Galaxy are also mainly dominated by the distribution of Dark Matter.

To date, humanity has not been able to determine the nature of Dark Matter within the Galactic Halo. However, some related cosmological models have proposed candidates, such as Supersymmetry particles and axions.

Of course, all the related theories are nonsense in the eyes of Rhomboid Crystal, but the scientists present can tell that Rhomboid Crystal also has some affirmation and appreciation for them.

"Since you have this foundation, I'm sure you understand without me having to explain further." The voice of the Rhomboid Crystal appeared again, seemingly sensing that the crowd understood its meaning.

"You mean individual galaxies, or isolated islands of Dark Matter?" an astronomer asked, recovering his senses.

"See, you all understand, don't you?" The Rhomboid Crystal seemed to chuckle with satisfaction.

Then its body emitted a burst of light, startling the scientists who were deep in thought, who thought something had happened to the Rhomboid Crystal.

Unexpectedly, the beam of light did not transform into a laser beam. Instead, it scattered like stars between the Rhomboid Crystal and the crowd, as if countless cool, fluorescent spots were drifting and gathering. Then, the crowd saw these stars disappear, replaced by a screen dominated by blue tones.

Or it would be more accurate to call it a 3D Holographic Screen.

"Holographic Technology!" Zhao Youqin, a communications and information scientist, couldn't help but exclaim upon seeing the Holographic Screen.

Humanity is already at Level 3 Civilization, and we still use projection screens. Holographic Technology that is so lifelike and allows you to grab the content inside doesn't even exist yet. How could he not be excited to see it now?

After the Holographic Screen appeared, everyone noticed that a dynamic river system image had appeared on Holographic Screen.

Yue Yuan also looked up and stared intently. He discovered it was a rotating animated image of the Milky Way Galaxy, and clearly an accelerated one at that. He was equally surprised by the Holographic Screen, but he knew that the Rhomboid Crystal's purpose wasn't to show everyone the Holographic Screen, but rather to show them the content inside.

He found the animated image familiar; it must have been copied from Human Database by the Rhomboid Crystal and shown to him and his group.

"Are we really living in Dark Matter?" A scientist asked, staring blankly at the rotating animated image of the Milky Way Galaxy on the Holographic Screen.

Humans have long noticed the anomaly of the Milky Way Galaxy's rapid rotation. Astronomers have discovered that the rotation speed of stars at the edge of the Milky Way Galaxy is far greater than expected.

According to Newtonian Classical Mechanics, the orbital speed of a celestial body should decrease as its distance from the center increases, because objects that are farther away experience less Gravity from the center and should therefore have a lower orbital speed.

However, astronomers, through observations of stars at the edge of the Milky Way Galaxy, discovered that their orbital speeds have not decreased significantly, but are similar to, and in some cases almost identical to, those of stars closer to the Milky Way Galaxy center. This undoubtedly contradicts traditional physics expectations, leading to the question: what enables the Milky Way Galaxy to rotate at such a high speed and uniformly? Since traditional theories of Gravity cannot explain this, scientists, after extensive research, introduced the Dark Matter. They believe that in addition to visible stars, gas, and dust, the Milky Way Galaxy must contain a large amount of unknown mass, which provides additional Gravity for Milky Way Galaxy rotation.

The Milky Way Galaxy doesn't fall apart during its rotation because the Gravity provided by Dark Matter holds the entire galaxy together. In Earth Era, some scientists believed that galaxies like the Milky Way Galaxy were shrouded in a huge fog of Dark Matter.

Later, astronomers conducted similar observations of the Andromeda Galaxy, and the results showed that the orbital speeds of stars at the edge of the Andromeda Galaxy were also higher than the expected speeds calculated based on visible matter.

This indicates that high-speed rotation is not unique to the Milky Way Galaxy, but is a universal phenomenon. It is the same in the Andromeda Galaxy and other distant galaxies. It is a common feature of many galaxies in the universe and a universal cosmic phenomenon.

So it's clear that the Rhomboid Crystal showed this picture to everyone present simply to tell humanity that their conjecture is correct: the Milky Way Galaxy rotates in this way because of the existence of a large amount of Dark Matter.

So what does this have to do with the immense difficulty of the Great Voyage? The answer is simple: Dark Matter provides Gravity, and where is the strongest Gravity source in the Milky Way Galaxy? It's the supermassive black hole at the Galactic Center.

In other words, the Dark Matter of the Milky Way Galaxy together shaped its appearance, and because Dark Matter has Gravity effect, it is concentrated in individual galaxies, becoming thinner the farther away from the galaxy.

The hallmark technology of Level Six Civilization is its Dark Matter -related Technology Tree. If Level Six Civilization leaves the Milky Way Galaxy, it will be just like Low-level Civilization that leaves behind stars, planets and other matter that provide resources and energy. It will find it difficult to move around in interstellar space and may even end up in regions where it cannot replenish its energy.

At that point, we would truly perish on the sea route.

It's important to know that Level Six Civilization's navigation technology involves Warp Speed Travel.

Although humans have not mastered Warp Speed Travel, they have learned something from their last contact with the Awakeners. Warp Speed Travel is different from conventional travel, which has inertial constant speed. It requires a continuous supply of energy to continue.

No wonder the Rhomboid Crystal said that it itself did not know how far the Precursor Civilization could go or where it would go.

Those who understood fell silent, a sense of despair in the face of the vastness of the universe welling up within them, an overwhelming feeling of oppression rising in their hearts, and that long-dormant sense of claustrophobia resurfacing.

When I gazed at the glittering stars again, the uncanny valley effect suddenly appeared. The stars seemed to have lost their color and become incredibly lonely. Behind the stars seemed like a dark Abyss that swallowed all life.

This endless sea of stars and vast universe is truly so vast that it is suffocating and despairing! At this moment, everyone felt a chill, and they all deeply felt the malice of the universe, the malice of the universe itself on life due to its vast and boundless scale.