After confirming that life on Ross 2 was still in its most primitive state and posed no significant threat to humanity, Lü Yongchang immediately ordered the commencement of the city construction project.
After completing a series of planning tasks, he boarded the Xuan Nu II again.
Before the Central City is completed, he needs to return to the Earth to continue his research mission.
During the voyage, Lü Yongchang sat in a chair and slowly closed his eyes.
Consciousness then arrived in the familiar fluorescent green space.
Against the fluorescent green background, the tree diagram outlined in bright white lines appears exceptionally clear.
The basic outline of the second-level civilization's technology tree appeared before him.
This means that, under Lü Yongchang's leadership, human civilization has mastered the main technologies of a Level 2 civilization within sixty years.
Next comes the task of "filling in" the various "branches" of the technology tree.
With all core technologies unlocked, the "filling" task is not difficult, but it is an extremely tedious task.
For example, the miniaturization of Type II laser weapons, the miniaturization and civilian application of ternary photonic computers...
As for why I would do such a thankless and arduous job...
Lu Yongchang sighed silently to himself and looked up at the top of the technology tree.
As before, at the top of the second-level civilization's technology tree, there is a faint, extremely dim cursor.
Based on past experience, this technology should be the threshold for entering a Level 3 civilization.
However, unlike before, this cursor was shrouded in thick fog.
No matter how Lü Yongchang adjusted the angle of observation, he could not make out the content of the cursor.
At first, Lü Yongchang was unaware of the intricacies involved.
It wasn't until he tried to fill in the "branches" of the technology tree that he realized the purpose of this fog.
With each branch of technology completed, the fog thins out a bit.
In other words, only after completely completing the entire technology tree will the technology tree system provide him with clues about advancing to a level three civilization.
Of course, Lü Yongchang also had wicked thoughts.
For example, advancing existing technologies directly without relying on system prompts.
But he soon gave up on his idea.
Without a clear direction, blindly trying your luck will only greatly delay the progress of completing the technology tree.
Instead of wasting that energy, it would be better to honestly complete the various branch technologies in the technology tree.
At least, with the efforts of all researchers, completing these branching technologies will only take some time.
For interstellar civilizations, perhaps the least valuable thing is endless time.
"Professor, we have arrived at our destination."
As a slight vibration came from the soles of his feet, Zero's voice rang in his ears.
Lü Yongchang quickly snapped out of his daze and slowly opened his eyes.
He skillfully unbuckled his seatbelt and electromagnetic adsorption device, stood up from his seat, and walked toward the hatch of the Xuan Nu II.
When he reached the hatch, the hatch, which should have opened automatically, did not open.
He frowned, a hint of unease flashing in his eyes: "Zero?"
"Professor, I'm here."
The holographic projection lit up, and Zero's virtual image appeared beside him.
Why won't you open the door?
Lu Yongchang said in a deep voice, "Is there a malfunction in the hatch?"
Extremely unusually, Zero did not answer Lü Yongchang's question, but said softly, "Professor, please wait a moment."
Upon hearing this, Lü Yongchang frowned even more deeply.
Zero didn't answer his question?!
This has never happened since the moment zero was born!
"Zero! What exactly happened?!" Lu Yongchang's voice turned stern as he directly ordered Zero, "Tell me the reason immediately!"
Faced with the creator's command, Zero hesitated for a second before saying, "Professor, this is Professor Su Yutong's instruction."
Lu Yongchang was taken aback for a moment, and subconsciously asked, "Su Yutong?"
"Why?"
His eyes were filled with doubt.
Why would this girl lock him up in the Mysterious Maiden No. 2 for no reason?
Zero replied calmly, "Professor, Professor Su Yutong's command permissions are at level two. Should we use the highest-level command to override it?"
Lü Yongchang was stunned again.
Wow!
Unexpectedly, this girl actually used her highest-level authority to "stop" him!
"Never mind." Lü Yongchang chuckled, sat back down in his chair, and waved his hand, saying, "I want to see what she's up to."
Ten minutes later.
"Professor, it's time."
Zero's voice rang out again.
At the same time, the tightly closed hatch in the distance suddenly opened.
Lu Yongchang didn't say anything, but silently stood up from his chair and walked towards the cabin door.
Looking at the hatch a few meters away, Lü Yongchang frowned.
It seems... there's nothing unusual?
He suppressed his doubts and quickened his pace toward the cabin door.
...
The moment I stepped out of the cabin, a familiar voice came from the side.
"professor!"
"Happy birthday!"
Then, a small cake appeared in front of him.
In zero gravity, the cake floats quietly in the air.
The surface of the cake was carved with some simple patterns.
Lu Yongchang froze on the spot.
He turned to look at Su Yutong, who was all smiles, and asked blankly, "Birthday?"
As far as I can remember, it seems like he hasn't celebrated his birthday in a long time.
Thinking back, the last time I celebrated my birthday must have been in my past life.
"yes!"
Su Yutong smiled radiantly and said in a cheerful tone, "Today is your 100th birthday!"
Lü Yongchang: "..."
Something feels off.
But if you calculate it carefully, not counting the time spent in hibernation, I am indeed 100 years old.
Thanks to the effects of the longevity hormone, he still retains the appearance of his youth.
That's why he felt particularly strange looking at the number 100 on the cake.
"Th...thank you."
Lu Yongchang awkwardly reached out and grabbed the floating cake in front of him.
Looking at Su Yutong, who was all smiles, he was momentarily speechless.
After a moment of silence, he slowly opened his mouth and said softly.
"Where did this cake come from?"
"I remember there wasn't any cream on the starship."
Su Yutong's expression froze.
Clearly, she hadn't expected Lü Yongchang to say something like that at this moment!
"..."
After a moment of silence, Su Yutong let out a long sigh of relief.
"I used genes from the gene bank to clone a cow and a hen."
"Right now, they're still in the biological laboratory."
(To avoid arguing, the technology that was banned and removed in the previous text is Proxima Centauri cloning technology.)
"As for the other ingredients... they're actually not difficult to make."
After a moment of silence, Lü Yongchang said with an increasingly serious expression, "Thank you."
Su Yutong's pretty face flushed slightly. She turned her gaze to the Second Mystic Maiden beside her and murmured softly, "Is it... just thank you?"
"..."
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