After further detailed investigation and verification, more traces of Level 3 civilization weapons were displayed in front of the members of the investigation team.

Energy weapons, really energy weapons!

Without mastering the system of equations of the quantum field and mastering the advanced mathematical tools, it is impossible to master the technology of making the projectile of the electromagnetic cannon in that excited state, so that it can transform from a simple electromagnetic cannon into an electromagnetic energy cannon.

And this can only be mastered by a solid third-level civilization.

At this moment, there were no more doubts in the minds of the members of the mission.

"Retreat, withdraw from the galaxy immediately!"

The head of the investigation team, who had remained at the edge of the solar system and had not entered the interior of the solar system, immediately gave the order.

At this moment, this ordinary star system is as dangerous as a wolf's den in his eyes.

He immediately contacted the captain of the Yunguang Aerospace Helicarrier, Yunguang, to report the incident.

"What? The Seventh Fleet is completely gone? ”

Yunguang's expression was cloudy and uncertain.

The way things turned out was something he could never have imagined. However, since this is already the case, it can only be reported.

As a veteran third-level civilization, the super-long-distance communication distance of the Southern Star civilization can reach one trillion kilometers, that is, about 0.1 light years. At this moment, the Yunguang Aerospace Helicarrier is as far away as dozens of light-years from Wang Liang's three-star system and from the home galaxy.

But it doesn't matter, in this star field, the Southern Star Civilization has laid many communication centers in advance, which can be used as signal relays. The Yunguang Aerospace Helicarrier can still easily contact the front-line command of the home galaxy or the Wang Liang three-star system.

After reporting the incident and receiving an order from the higher authorities to "divert to another star system to receive and transport another shipment of supplies", the USS Yunguang began to accelerate again.

This is the end of the matter about the solar system. After all, the suspects are already dead, so what's the point of investigating?

At this moment, about 1.3 light-years away from the sun, under the illumination and encirclement of thousands of stars in the vast universe, the huge human fleet is still accelerating.

Chen Yue saw that the universe, which was originally pitch black and only dotted with a little bit of starlight, had undergone a strange change along with the increase in the speed of the fleet.

In front of the fleet, the dark and deep universe gradually took on a little red. Some stars, which were originally red, have become blue. There are also blue stars that become invisible to the naked eye.

In the rear of the fleet, nothing has changed. However, some stars that used to appear red have now disappeared and are no longer visible to the naked eye. Some stars that used to appear blue are now red.

One blue, one red, dotted with thousands of stars that are also blue or red, making the vast universe colorful at this moment.

At this moment, the human fleet is not sailing in the universe, but in a fairy tale.

"It's beautiful."

Chen Yue sighed secretly.

He wasn't alarmed by the change. Because he knew in his heart that these were just natural phenomena and that there were sound scientific theories to explain them.

In fact, this phenomenon was predicted as early as the age of the earth. It's just that Chen Yue has seen it with his own eyes at this moment.

Chen Yue knew that those rays of light were actually the colors of the universe.

Its official name is cosmic microwave background radiation. It is the oldest light in the universe.

The existing theory is that the universe originated from a "Big Bang".

Our universe is constantly expanding. On a cosmic scale, the distance between any two points is expanding over time. Moreover, the farther apart two points are, the faster their distance expands.

This is the theory of the expansion of the universe. This theory has been confirmed by real-world observations.

It is even believed that at extremely far away from Earth, where celestial bodies may move away from Earth even faster than the speed of light.

To understand the expansion of the universe, such a simple analogy can be made. Imagine that the universe is a small balloon, and if you randomly point two dots on this balloon, and then blow up the balloon, you can see that the two points that were originally very close to each other have become larger with the balloon getting bigger.

In addition, the two points that are originally farther apart will move away from each other as the balloon expands.

Such is the expansion of the universe. As for why this is so, it is still unknown to Chen Yue. However, he speculated that the universe may also be a sphere at the four-dimensional level, which is why it is like this.

A balloon is a three-dimensional ball, whereas the universe is a four-dimensional ball.

Once we understand the expansion of the universe, we can use the general theory of relativity to reverse the expansion of the universe in time.

- Since every second that passes, the universe expands a little more, then every second that advances, the universe should shrink a little.

One day, at that time, the universe should be infinitely small, and it should be in a state where density and temperature are almost infinitely high.

This point is called a "singularity" by Chen Yue.

Along with some physical processes that Chen Yue could not yet understand, this "singularity" suddenly began to expand at an extremely high rate, as if it had exploded—this is the origin of the word "big bang" in the Big Bang theory.

With the explosion of the singularity, all the matter in the universe is ejected from this infinitesimal singularity. As a result, thousands of stars were formed, stars began to be lit up, many stars began to converge into river systems, and planets began to revolve around stars......

The cosmic microwave background radiation comes from this Big Bang. Even, the cosmic microwave background radiation itself is the most direct evidence of the existence of the Big Bang.

It is the "light" released by the universe itself in the midst of that Big Bang. It appeared before any star. Before the first star in the universe was lit up by nuclear fusion, it spread throughout the universe.

At a time when the human fleet is running at a low speed, the cosmic microwave background radiation is not visible at all, and can only be seen through sophisticated equipment. Because it's not visible light.

But when the human fleet was at a higher speed, the situation quietly changed. The speed is too fast, and the wavelength of the microwave radiation in front of the spacecraft is shortened, the frequency increases, and the energy is also increased accordingly, so the microwave becomes visible light, which can be directly seen by the naked eye.

Also with the acceleration of the fleet, those stars that could have been seen at the rear of the fleet gradually changed from visible light to infrared light and were invisible to the naked eye because the frequency of their light decreased and the wavelength increased.

Among the frequencies of visible light, red is the lowest, and purple is the highest. As a result, with the continuous acceleration of the fleet, the color of the cosmic microwave background radiation in front of it is slowly changing.