The three of them walked around the ecological garden on the first floor, and in the old man's introduction, Yanagihara saw many things that she had forgotten again, such as blooming flowers and abundant fruits. In this snow-white world, their colors are undoubtedly rare, and some people may not see them once in their lives.

Like Al, who was attracted by a cluster of flowers, crouching next to a flower bed, quietly watching the petals sway.

In the old man's description, the girl was a little surprised to learn that these plants were alive, but she also wanted to know the truth about these lives.

It turns out that humans are curious in addition to panic about the unknown.

One of them hinders the pace of human beings, and the other pushes human beings forward, perhaps this is the original contradiction in the hearts of human beings, and in this contradiction they develop and survive, so that they create such complex and contradictory creatures as human beings.

Probably noticing the concentration in the girl's eyes, a smile appeared on the old man's face, he likes children, because children are always simple. Because children are always more likely to fantasize about the future than adults who have bowed to reality.

Fantasy, on the other hand, will keep people going.

They are the hope of the future, the old man has always felt so.

"Do you like these flowers?" Standing at the exit of the ecological park, the old man asked Al as he spoke.

Al may have been taken aback by the old man's sudden question, and turned back in a panic.

She looked at the old man, then lowered her head again, hesitated, and said nervously.

"Well, they're beautiful."

"Then when you leave, I can give you one." The old man smiled softly and glanced towards his ecological garden.

"If you believe them, you'll want to see the outside world."

"By the way, little girl, do you know what kind of miracle these tiny beings have created?"

"Hmm, I don't know······"

"They used to be all over the planet, and they used to bloom anywhere."

The old man's voice was flat, but that could not hide the magnificence he described.

Al's eyes were slightly dazed, probably imagining the old man talking about the past, imagining the appearance of flowers all over the ground.

As for Yanagihara, she glanced out the window with a little regret.

The boundless ice and snow had buried all her memories of the past.

"Alright, I'll take you to the third floor, where I usually work, which is the research area of this observatory."

As he spoke, the old man led the two of them to the top floor.

Yanagihara and Al followed him, each thinking about their own things, on the one hand, the regret that had been compromised, and on the other hand, the yearning that had not yet dissipated.

"Yanagihara." Up the stairs, Al suddenly raised his head and asked Yanagihara.

"Will the snow on the ice sheet melt later?"

Hearing this question, the old man looked at Yanagihara, who knew that Yanagihara's next answer might be important to the girl.

For even he could see that the girl trusted the wanderer, who didn't seem so friendly.

Faced with the girl's question, Yanagihara thought for a while, and finally replied slowly.

"Yes."

In the end, she chose this relatively good answer, even though she had seen too much misery.

"Hmm." Al replied softly, looking back in anticipation at the flowers, fruits, and plants in the ecological garden.

"That's great."

"Huh." The old man stretched his old eyebrows and smiled shallowly.

He nodded at Yanagihara, who responded to him with Yanagihara's silently averted gaze.

What a couple of energetic young men.

The old man thought so.

I'm sure their journey will be interesting.

But in fact, the old man didn't know that Yanagihara was a cold-blooded madman at all, and she would take the girl to death.

And the girl will never see the day when the snow melts.

······

The third floor of the observatory is pale, as its main color is white. White walls, white floors, and white tables and chairs make up the main color of this floor.

Everything seemed to be a single off-white, except for a brightly colored picture on the computer screen on the right side of the room.

The background is pitch black, but in the center of the image is a large luminous sphere, and in the middle of the sphere is a small circular shadow.

"This is what I call the Transcendent Star Method."

Presumably noticing that Yanagihara and Al were observing the picture, the old man explained as he stood beside them.

"In addition to revealing the existence of a planet, its light signal can also tell us about the planet's size and orbit. After that, we can determine whether the discovered planet is in the habitable zone by observing changes in light, or by measuring the distance between the planet and the star it orbits to determine if there is liquid water on its surface. ”

"At the same time, we can also use the spectral pattern of the received star to infer the temperature of the star, so as to find a galaxy suitable for humans to stay temporarily."

"And what about this star?" Yanagihara looked at the data on the screen and asked out loud for some reason.

"Class A spectral type, mass 3.1M⊙, radius 2.1R⊙, brightness 40L⊙, strong hydrogen line, main-sequence star proportion 0.60%, temperature range 7,500-10,000K." The old man said, shaking his head.

"No, it's too hot."

Yanagihara shrugged her shoulders, as if to show that she roughly understood, so that she wouldn't seem so ignorant right now.

But it is undeniable that she basically failed to understand the other data except for temperature.

The old man continued as he walked over to the computer and began to adjust the parameters again.

"But it's not the galaxy I'm mainly tracking now, in the last three months, I can just observe a habitable galaxy that I discovered before, but unfortunately the wind and snow are too big these days, and I can only wait until the snow is a little smaller to study."

"Oh, yes." Saying this, the old man seemed to remember something again, perhaps because of his age, he has not been able to finish the words at once lately.

"Yanagihara, and this little girl, have you ever seen a meteor shower?"

"If not, I think I'd say you're lucky, because in a few days' time, there's going to be one here, and it's probably going to be extraordinarily grand."