This question is also what Mu Yin has been pursuing.

It is also what he has fought for, distressed about, and even despaired for.

Mu Yin only lost his temper for a few seconds, and then regained his composure, looking at Cheng Yun's eyes, he pursed his lips, and glanced at the Yin woman next to him, still leaning lazily on the chair, and replied with certainty: "I know." ”

"Can you tell me?"

"Gladly. Mu Yin smiled slightly.

"Thank you. Cheng Yun said sincerely.

"You're welcome, it's a small thing, and if I can make you have fewer regrets, I'd be more than happy to do so. Mu Yin narrowed his eyes slightly again, "Speaking of which, this question ...... When I first fused the space-time node, a senior came to me, and I asked him. ”

"Yes......" Cheng Yun raised his eyebrows, which was quite interesting.

Is it a convention for the 'masters of space'?

"Yes, including the question you asked me earlier, I asked him too. Mu Yin's smile became gentle, "That's how he answered me. ”

"......" Cheng Yun was speechless.

Could it be that many years later, he will also find the newborn master of time and space in the endless lonely time, and then go to find him, and repeat today's events?

"You guessed it right, today's events have actually been repeated many times among the masters of time and space. Mu Yin said.

"But there is one thing you may be disappointed in. Mu Yin looked at Cheng Yun, his eyes were as calm as water, and he couldn't see any emotion, "There are some rules in this universe that cannot be violated, especially when it comes to the self-defense and security mechanisms of the universe, and there is also an upper limit to the lifespan of creatures. And this upper limit may not be as long as you think. ”

"The upper limit?" Cheng Yun's expression stiffened suddenly, "What does this have to do with the self-defense and security of the universe?"

"Of course there is. Lifespan is the shackles of a biological race, if the lifespan can be extended indefinitely, there is no upper limit to this race, you can imagine what will happen if the microbes in your body can grow all the time. Mu Yin narrowed his eyes and looked around again, "Don't look at the fact that it has only taken more than a hundred years since the birth of your universe, you think that the evolution history of the universe is only so long, in fact, our universe is far more intelligent than you think." ”

"Evolutionary History......

Cheng Yun's eyes widened suddenly, and he keenly captured this keyword.

Evolutionary history and longevity are clearly two different things.

As for the longevity of the universe, the current earth technology cannot touch this problem. There are always various institutes that study it and then announce the results, but each one is different. There is the most false and sensational that the universe has only a billion years left to live. There are also relatively objective conservative claims based on the law of decay that even if the universe decays from now on, it will still exist for so many more years, and then there will be more than 200 or 30 billion years, and the longest one will say that the universe will live for at least 100 billion years......

But how many years has the universe evolved?

Or rather...... How many generations?

Just like humans, they have a lifespan of less than 100 years, but they have evolved from generation to generation for millions of years.

Evolution is a screening process.

Only with inheritance can it be called evolution!

Is this how the universe has been passed down from generation to generation?

Cheng Yun has faintly touched on the key point.

There are so many relationships between the universes, why there are so many similarities, and how they relate to each other.

But even according to this crucial point, there are still multiple possibilities, which Mu Yin will not tell him directly.

Cheng Yun shook his head and shook off these thoughts, his focus now should not be here.

"Is this ceiling, this rule, even you can't break it? Or when you can break it...... There's no point in it anymore?"

Mu Yin was silent again for two seconds: "No, it can't." ”

"About two-thirds of the Masters of Time and Space have been working on this for tens of billions of years, and have been relaying, one by one, trying to break this rule. And that includes me. As for why......" Mu Yin narrowed his eyes, "Maybe it's because the long life is too boring, find something to do." Perhaps breaking the rule itself has more implications. Or maybe it'...... For the later nascent space-time master. ”

"The age and lifespan of the universe can be seen, but no one knows how many years the endless universe has existed. ”

"Has anyone done this before? We don't know. ”

"There may have been people who did this before, but it had the serious consequences that the method was not passed down. Or maybe the predecessors did not pass it on, but brought it to destruction. Even...... The consequences of breaking this rule were recognized, and the rule was reinforced. ”

"None of that, we can guess. Mu Yin said calmly.

"That's it......" Cheng Yun didn't ask Mu Yin why he guessed that it might have serious consequences, and he still had to do this, sometimes someone wants to do something, and they can really be desperate.

For the sake of the future time and space domination......

Cheng Yun had another string touched in his heart, although he wasn't sure if this was really the case, but he seemed to be able to imagine such a scene - one after another time and space masters watched their friends and relatives disappear in turn and were powerless, until the last friend died, until he didn't want to make friends anymore, but he was still looking for a way to break this rule...... It's just that in the long life, I want future generations to no longer experience this pain.

How long time is, in such a long life, presumably many of the original obsessions will become insignificant, but this obsession can still be preserved for tens of billions of years......

It's incredible, it's so beautiful!

Soon, Cheng Yun asked again: "So how long is this upper limit?"

"How long is ......"

"The upper limit of life span is different for each biological race, and even for each biological individual, if it is pure human blood, it is not much different......"

"The concept of time is too different, but in short, it's not very long. Mu Yin said, "Only Origin Energy is something that has the same nature no matter which universe it is, and if we take the time it takes for Origin Energy particles to vibrate a trillion times as a unit, then the upper limit of human lifespan is about 105 billion units. ”

"Every second that humans spend has an impact on lifespan, and if every second doesn't have a negative impact on lifespan, then the maximum value of life expectancy can be reached. ”

"I still remember that when converted to the universal time of the planet where I was born, it was about two thousand years. Mu Yin said.

"......" Cheng Yun tugged at the corners of his mouth.

"Okay. Mu Yin continued to smile slightly, "You first tell me how your civilization sets the unit length of the concept of time?"

“……”

Cheng Yun only vaguely remembered that the length of each second was related to the microwave oscillation of the cesium atom, but he didn't know how many times the cesium atom oscillated as a second, and he didn't even know what the cesium atom was.

Mu Yin closed his eyes helplessly.

After a while, he opened his eyes again: "Okay, your world stipulates that the length of time it takes for an isotope of an atom to make 9192631770 transitions is one second, every 86,400 seconds is a day, and every 365 days or so is a year......

"About four thousand two hundred years...... Cheng Yun's eyes widened.

In other words, Cheng Yan, Tang Yaoyao, and Yin Nuxia...... Wait, they can only live for more than 4,000 years at most.

Unless he can break this cosmic rule, this rule that so many great masters of time and space cannot break in tens of billions of years...... Even if he could, they would be long gone!

Cheng Yun suddenly fell silent.

Mu Yin seemed to see what he was thinking, and said, "If you feel unwilling, then try to find a way to break this rule." Even if it doesn't make sense to him anymore, maybe there will be future generations who need you to stop this despair for him. After all, only after experiencing it can you know how painful it is......"

Mu Yin looked at Cheng Yun calmly.

Cheng Yun also looked at him.

After a while, Cheng Yun retracted his gaze and asked again, "How many ...... have you seen?" Same as us?"

"Have you seen it...... Seven or eight. ”

"Have you lived for so long, have you only seen seven or eight?" "Tens of billions of years, seven or eight!" Cheng Yun's heart suddenly blocked, almost suffocating.

"Yes, because we can't go too far, and the farther we go, the greater the universe's rejection of us until it's too big for us to enter. Mu Yin said, "So I've only seen the space-time master of the universe not too far away, probably ...... There will be one space-time node every seven or eight universes, and how many space-time nodes will have a space-time master, this number is too big......"

"I see. Only then did Cheng Yun realize that the 'not too far around' he said was actually a number that was unimaginably big.

"But we can connect with each other and deliver messages through an endless number of space-time nodes. Mu Yin looked at him with a smile, "This method is very simple, but I can't tell you yet." ”

"Why?"

"You're still too weak. ”

"Weak?" Cheng Yun was stunned.

"Yes, as you think now. Mu Yin looked at him, "Because it's going to be dangerous." ”

"Because the time in tens of billions of years is too long, too long for any living thing to imagine, not everyone can maintain their hearts for such a long time. I came to see you to confirm that, and now it seems that you are doing much better than I thought. ”

"Is anyone lost?" asked Cheng Yun.

"Hmm. Mu Yin nodded, he and Cheng Yun had always been very active in talking, "Each time and space master has different ways of dealing with the torture caused by a long lifespan, but it can probably be divided into several types: someone is ruthless enough, bold enough to turn himself into an indifferent god, no sorrow or joy, no excitement, Some people are too greedy and endure as much as possible, constantly enduring the pain and joy brought about by joys and sorrows, and constantly endure torture...... Looks pretty much the same;"

"There are also people who are not strong-willed, who have become mad and dark because of boredom, because of the torment, because of the grief of the death of friends and family, the destruction of their homeland, and you can never imagine what they will do. ”

"What will you do?" asked Cheng Yun.

"Maybe you'll see the universe as a plaything, that's fine. Perhaps they will take the initiative to find other universes and become the Demon God of World Destruction. Especially if you love to find those universes that have just been born as space-time masters......" Mu Yin saw a look of vigilance on Cheng Yun's face, and smiled again, "Because the newborn space-time master is too weak to protect his own universe, he destroyed his home in front of this space-time master, turning his universe into an empty one, so that the newborn space-time master can experience the grief and despair he once experienced, and then collapse...... Maybe it can satisfy some of his perverted desires. ”

"Huh. Mu Yin put down Erlang's leg and switched to the other side, "But when you meet this kind of person, you can ask for help from the space-time masters of other universes, and most space-time masters will be happy to help you solve this trouble." ”

"......" Cheng Yun didn't say anything, looking at Mu Yin.

Mu Yin didn't mind about it either.

"So, are you the third type?the one who keeps his heart?" Cheng Yun looked at Mu Yin tentatively.

Mu Yin always smiled, but this time he smiled and didn't answer.

Suddenly, he said, "Do you mind if I visit your outer universe?"

.。 m.