The universe in which humans live is three-dimensional.

Length, width, and height.

These three basic elements constitute the universe and explain everything in it.

Any object or living thing can be described using these three indicators.

No matter how thin it is, even if it is only one millimeter, one micrometer, or one nanometer, it still has thickness and can be measured!

But now, what lies before everyone is countless abnormal data transmitted back by the detector!

It sits quietly on the surface of a star, like a virtual painting!

But everyone knows that it is by no means an illusion!

At least half of the energy emitted by Ross 154 was completely absorbed by it!

This incongruous scene stirred the nerves of everyone present.

Thirty seconds passed in a flash.

Under Lü Yongchang's gaze, the "gray" substance rapidly contracted.

In less than a second, it shrank from the size of half a star to a small "canvas" 100 kilometers long and wide.

It then retreated back into Ross 154.

Rose 154 has also been restored to its original appearance.

It was as if what had just happened was an illusion!

The 1420 MHz signal flickered again.

[Little ones, have you seen enough?]

A line of text appeared in the holographic projection.

Lu Yongchang suddenly came to his senses. He opened his mouth, but didn't know what to say.

There are so many questions in my mind, but I don't know how to express them!

After some further deliberation, Lü Yongchang raised his hand and slowly tapped the holographic image in front of him, typing out a few lines of text.

[Dear Level 7 Civilization, I apologize again for disturbing you recently.]

If you need anything, please don't hesitate to ask; human civilization is willing to serve you.

...

Shortly after the message was sent, the human fleet received another response from [Painting].

Service? Heh.

What can a mere level two civilization do for me?

"Avenge me?"

The message was filled with a strong sense of disdain.

But Lü Yongchang didn't pay attention.

After all, for a Level 7 civilization, human civilization is not even as good as an ant on the roadside.

The fact that the other party is willing to talk is already a great blessing.

But the last sentence made his eyes widen!

Revenge?!

The other party actually mentioned revenge?!

Could it be that...

Lu Yongchang's breathing quickened slightly, and after considering his words for a moment, he quickly responded.

[You just mentioned revenge?]

Even someone as strong as you can get hurt?

The 1420 MHz signal flickered rapidly.

[Heh... I'm just a level seven civilization.]

Lu Yongchang's eyes shifted rapidly, and he asked again.

Are there many civilizations of type VII or higher in the Milky Way?

How did you get injured?

But this time, the 1420 MHz signal remained unchanged.

This two-dimensional creature named "Painting" suddenly became aloof and stopped responding to messages sent by humans.

...

Half an hour later.

Looking at the Ross 154 images transmitted back by the probe, and then at the "chat log" that ended with the last sentence, Lü Yongchang frowned and sighed softly.

"Professor, what should we do now?"

Cao Liangcai's voice came from the side: "To leave or to stay?"

After a moment's thought, Lü Yongchang slowly shook his head.

"We can't leave."

"At the very least, we cannot act rashly before the other side speaks."

"The fleet should remain where it is, and all construction work should be suspended."

“Zero, maintain surveillance on Ross 154…monitoring.” Thinking of the terrifying entity within Ross 154, Lü Yongchang swallowed the words that were about to come out, rephrasing them instead, “If they send another message, notify me immediately!”

Then, he reached out and rubbed his somewhat stiff face, and said in a deep voice.

"Next, we should organize the information we gained from this exchange."

...

"first."

“The other party is a two-dimensional being, there is no doubt about that.” Lü Yongchang reached out and pulled up several data points transmitted back by the detector. “No matter what detection method we use, we cannot detect the other party’s ‘thickness’.”

"Of course, it could also be because our equipment is too outdated."

At this point, Lü Yongchang shrugged: "Personally, I prefer the former."

"In addition, this can be observed after slowing down the footage."

"The other party can easily contract and extend their body."

"As for why it doesn't envelop the entire star, my guess is that such an action would require a huge amount of energy."

"At least for the time being, it is a losing proposition."

"At the end of the conversation, the other party mentioned the word 'revenge.' Combined with the above conjectures, we have reason to suspect that it is currently in a state of injury."

"Furthermore, it needs Ross 154 as its energy source."

"This is also why Rose 154 was unusually bright back then."

Does anyone have any objections to this?

After speaking, Lü Yongchang glanced at everyone.

Seeing that no one objected, he spoke again, "Alright, based on this, let's analyze the other party's words."

"The other party claims to be a level seven civilization, two-dimensional beings, and born in the Triangulum Galaxy five billion years ago."

Lu Yongchang paused for a moment before speaking again: "The Triangulum Galaxy, the third largest galaxy in the Local Group, is about 2.95 million light-years away from the Milky Way."

"We assume that the other side possesses warp drive technology, which could greatly shorten this long journey."

"But how did they cross this almost vacuum-like open area?"

"The other side received almost no supplies during the voyage."

"Then why would it go to all that trouble to come all the way to the Milky Way, only to get beaten up by that so-called more advanced civilization?"

Suddenly, He Bilin, who was in the distance, raised his right hand.

Lu Yongchang was slightly taken aback, then nodded and said, "Go on."

He Bilin straightened his expression and said seriously, "Professor, I need to correct something."

"It is not impossible to replenish materials during intergalactic travel."

Upon hearing this, Lü Yongchang raised an eyebrow: "Oh?"

"Tell me in detail."

He Bilin mentally organized his thoughts before speaking again: "According to our observations, there is a galaxy bridge between the Triangulum Galaxy and the Andromeda Galaxy."

"This galaxy bridge is primarily composed of neutral hydrogen."

"Based on current observational data, this galaxy bridge is 782,000 light-years long."

"By the same token, we have reason to suspect that a similar structure exists between the Triangulum Galaxy and the Milky Way."

"However, we have not yet discovered this galaxy bridge."

Lü Yongchang nodded thoughtfully.

"If that's the case, then it makes sense."