In the public classroom, the students talked a lot, because a bombshell news spread throughout the campus in a very short time. （）

Bald Qiang, Kojiro, Dongfang Undefeated, Zhang Binhui, the disciple of the Shou Ape has joined the Human Rank Branch.

Francis's face was full of excitement, and he kept looking around the classroom, hoping to find the familiar figure.

This guy secretly joined the branch, and he didn't even tell himself, and he didn't treat himself as a brother?

Francis believes that Zhang Binhui will come to listen to this lesson, because this lesson is about the history of mankind's exploration of the galaxy, and today it is about the secrets of the galaxy, which is the hometown of this sullen guy.

Sure enough, it didn't take long for that familiar figure to appear at the door of the classroom, and the lively classroom immediately fell silent, and everyone's eyes were attracted by the tall figure.

A mysterious figure has finally appeared.

Zhang Binhui felt very unaccustomed, he was looking for a seat in the face of all the attention, and every student showed a strong interest in him.

The girls were very generous, and many people beckoned him: "Handsome guy, sit here, there is no one here." ”

Zhang Binhui wanted to, but he didn't dare, although Lingdoudou didn't come over, there may be their eyeliner here.

Flowers are very tempting, but they are very dangerous, and if the three girls lose their temper, Zhang Binhui will be terrified.

After practicing, everyone's body is moving towards the ultimate of perfection, so the call of the beauties made Zhang Binhui feel a strong pressure. Like a battle, Zhang Binhui tried his best to control his feet, but his back was already wet.

A student stood up in the back row, and he shouted at Zhang Binhui from a distance: "Xiaohui, come here, I have a place here." ”

Zhang Binhui looked up and saw that Francis was waving at him, so Zhang Binhui ran over like a desperate death like a long drought and nectar.

Francis smiled and beckoned Zhang Binhui to sit down, and then punched him: "Okay, I don't tell my brother when I enter the school, it's so secret!" ”

Zhang Binhui smiled and dealt with him a few words, and footsteps came from outside the door again.

It was a beautiful lady who entered, and the classroom immediately fell silent. She is the instructor of this course.

Cai Lin, Teacher Cai will teach students the pioneering history of the human galaxy.

After the jade slip was excited, a familiar star map appeared in front of everyone, which was the galaxy that made Zhang Binhui feel the most cordial.

The galaxy is like a jade plate, it is so beautiful.

"The history of the exploration of the human galaxy began 1.3 million years ago."

Mr. Cai clicked on the projection, and the jade plate expanded sharply, and a dense nebula like sand appeared in front of everyone.

"The Milky Way is a huge galaxy that includes 1,000 to 400 billion stars and a large number of star clusters, nebulae, and various types of interstellar gas and interstellar dust.

With a diameter of about 100,000 light-years and a center thickness of about 12,000 light-years, the total mass of visible matter is about 140 billion times the mass of the Sun. As you know, the solar system is the galaxy that we have developed, and it belongs to the Milky Way.

In the past, the Milky Way was thought to be a spiral galaxy like the Andromeda Galaxy, but the latest research suggests that the Milky Way should be a barred spiral galaxy. According to our estimates, the mass of the Milky Way should be only half that of the Andromeda Galaxy.

Even so, the Milky Way is still extremely huge, and so far, we have only explored a tenth of the extent of the Milky Way, and there are still vast spaces in the Milky Way that we have not yet reached. ”

Speaking of this, Mr. Cai's fingers inspired a pillar of light, and the pillar of light dotted on the top of the Milky Way.

"As you can see, the Milky Way has a huge disk structure with a galactic core and four spiral arms, each 4,500 light-years apart.

After millions of years of exploration, we have found that the clusters of stars in the inner periphery of the Milky Way are older, while the outer stars are younger, and they are more habitable there.

So we can speculate that the formation of the Milky Way began from the interior and gradually evolved to a diameter of more than 100,000 light-years.

According to some newly discovered evidence, the Milky Way has swallowed up many small galaxies as it grows, and objects from other galaxies have merged into the interior of the Milky Way.

If we want to attract so many stars around us, we think that the center of the Milky Way is most likely a time hole. There, all rules are invalid. ”

Seeing that everyone was listening very seriously, Mr. Cai smiled: "To add, time hole is a name, different places have different names, and some places call time hole a black hole." ”

Zhang Binhui's heart was pounding: her hometown had finally unveiled her mystery.

"Based on the latest discoveries, we believe the Milky Way is still expanding. If we want to understand why the Milky Way grows, we need to grasp the term dark energy.

Dark energy is an anti-gravity force, and nearly 73% of the universe is made up of mysterious dark energy, which is something that we are also in awe.

Through expansion, mankind has discovered nearly 200 billion galaxies in the universe, and each galaxy has about 200 billion planets, but all of these add up to only 4% of the entire universe.

On the basis of new space exploration, and through careful study of 1 million galaxies, we have at least partially figured out that about 23% of the universe's matter is "dark matter".

No one knows exactly what they are, because they cannot be detected, but their mass is vastly greater than the sum of the visible universe. And nearly 73% of the universe is the latest discovery of dark energy. This strange force seems to be accelerating the expansion of the universe.

We believe that dark energy, as well as the emergence of galaxies, was created after a Big Bang. ”

The Big Bang? Hearing this term, Zhang Binhui's heart moved, this theory has been mentioned by scientists on the earth, and it turns out that it really exists.

"The universe was formed by the expansion of a dense, hot singularity after a Big Bang 20 billion years ago.

The universe has a history of evolution from hot to cold. During this period, the cosmic system was constantly expanding, and the density of matter continued to evolve from dense to thin, like a huge explosion.

At the beginning of the explosion, matter could only exist in the form of elementary particles such as neutrons, protons, electrons, photons, and neutrinos.

The continuous expansion after the explosion of the universe causes the temperature and density to drop very quickly, and as the temperature decreases and cools, atoms, nuclei, and molecules gradually form, and they compound into the usual gas.

The gas then gradually coalesced into nebulae, which further formed a wide variety of stars and galaxies, eventually forming the universe as we see it today.

We studied the Milky Way, which is supposed to be as old as the universe, so we think the Milky Way is a product of the Big Bang. ”