There are traces of the galaxy

The guide squatted down and looked at the girl. The girl looked at him with watery eyes, and pointed at the little boy standing beside him, "He lied to me that these nebula maps are all fake."

The boy stared, and anxiously argued: "I didn't lie to you! I saw it in the Journal of Children's Science. These pictures have been post-processed, and the original pictures are not good-looking at all."

The corner of the girl's mouth curled downwards, she couldn't hold back her tears, "You lied..."

"Hey, don't cry." The guide briefly raised his right hand, as if he wanted to hug the girl to comfort her, but put it down again, and looked up at Li Zhi for help.

"..." Li Zhi simply squatted down and took out the tissue he carried with him to wipe the girl's tears.

"Brother, is the nebula map real?" The girl managed to stop her tears, and tugged at the corner of Li Zhi's clothes slightly, "He's lying to me." classmate.

"I didn't!" The boy glared at her, and then looked expectantly at Li Zhi.

Children of this age are always obsessed with asking whether something is true or false, wrong or right, and they must get a clear answer.

It's not that Li Zhi has never seen this kind of scene. Jiang Zhao loves to cry a lot. Li Zhi's coping method has always been simple and rude-you cry enough here by yourself, and I will leave.But in the current situation, he definitely can't go.

Li Zhi paused for a moment, then looked up.It was a colorful nebula, moving slowly, with large green clouds spread out, a small piece of diffuse dark red at the upper left, and many dark blue stars dotted in the middle and around, which looked magnificent and dreamy.

But in fact, the image captured by the astronomical telescope is not so long, but a gray one, which looks far less beautiful than it is now.The human naked eye cannot distinguish the color of this wavelength, and only through complex post-processing can rich colors be presented.

But how should I explain it to them?It is strange that primary school students can understand terms such as wavelength range and near-infrared narrow-band filter.The girl began to shed tears again, but Li Zhi was very restless and on the verge of impatience.The lecturer tried to explain to them, but when he opened his mouth, various physical terms were piled up.

At this time, there was a sound of footsteps at the door, and another group of guides came in with a group of children, accompanied by a familiar clear voice, "Now everyone has come to the Sky Screen Exhibition Hall, where we can see..."

Li Zhixun turned his head and saw Lin Chaosheng with a faint smile on his face, who was very patient with the children.

"Hey?" Lin Chaosheng held a blue star stick in his hand and waved at Li Zhi, "I just wanted to call you after visiting this exhibition hall."

The scene in front of him was too funny, Li Zhi burst into laughter, "What are you holding?"

"I bought it at the souvenir shop outside, one for each of our group."

Sure enough, behind Lin Chaosheng, every child held a pink or blue star stick in their hands, and it was still shining.

"Why are you crying?" Lin Chaosheng handed the star stick in his hand to the little girl who burst into tears again, "Here is this for you."

Li Zhi's feet lost consciousness and became numb, but he had no choice but to wipe the girl's tears again.

"Thank you..." The girl took the star stick, sobbed and denied, "I... didn't cry."

"Please explain the nebula map to us." Li Zhi frowned and propped his elbows on his knees.

Lin Chaosheng glanced at him, with a faint smile: "I'd better pull you up first." He bent slightly, and stretched out his left hand towards Li Zhi.

Li Zhi hesitated for two seconds, grabbed his hand, and stood up with his strength.

"Hiss—" His legs also went numb.He helped Lin Chaosheng's shoulder and almost stopped.

"Can you stand up?" Lin Chaosheng asked.

"..." He just touched Lin Chaosheng's shoulder, and immediately moved his hand away as soon as he stood still, as if something burned him, "Yes."

Lin Chaosheng asked clearly why the girl was crying. For children, it is cruel to have their beautiful illusions broken, and he also wanted to protect this beauty.

"After you go to junior high school, you will learn in physics class that the colors we see are the perception of light by the naked eye. For example, the three colors of red, yellow and blue represent three different kinds of light, which are called wavelengths in physics. Range, this range is visible to the naked eye, understandable?"

"Yes—" the children answered in unison.

"However, the original color of the nebula map is invisible to the naked eye. It can be presented in front of our eyes with some technical means, just like adding a filter after taking a photo, which can make the photo look better," Lin Chaosheng paused and continued Said: "Therefore, the nebula map we see does not have any deceptive elements, it is just because we cannot see its original color, in order to let us see it, we can only replace the original color with red, yellow and blue. "

……

While Lin Chaosheng was speaking, Li Zhi kept staring at his face seriously, but actually didn't listen to what he said at all.The warmth and tactile sensation of grasping Lin Chaosheng's hand still remained in the palm of his hand, which was warm and powerful, a feeling he had never felt before.

After the two groups visited this exhibition hall together, Li Zhi followed Lin Chaosheng to other exhibition halls that had not yet been visited.

The afternoon passed quickly, and Lin Chaosheng led a group of children out of the gate of the planetarium. The teacher who led the team was already standing by the fountain outside the gate, waiting for them to gather.

The children in this group were very reluctant to part with Lin Chaosheng, and rushed over to hug him.A small figure flashed out of the crowd that had assembled by the fountain and ran towards this side. It was the crying little girl in the canopy exhibition hall.

The girl tugged at the corner of Lin Chaosheng's clothes, motioning him to bend down, and Lin Chaosheng bent down/body in doubt.The girl whispered something in Lin Chaosheng's ear, then patted his hand with a flushed face, and then quickly ran into the team.Li Zhi on the side couldn't help sighing: It is indeed a talent to be liked.

After watching them go, Li Zhi couldn't help asking: "What did she tell you just now?"

Lin Chaosheng smiled and said mysteriously, "Secret."

Li Zhi was expressionless: "...Oh."

"She told me her name, and—" Lin Chaosheng couldn't hide his pride, and showed off childishly: "She said she likes me very much."

Li Zhi: Okay, I see, you are very charming.

After a few seconds of silence, Li Zhi asked again: "Shall we have dinner together later?" He felt that Lin Chaosheng would not refuse.

Unexpectedly, Lin Chaosheng paused, with an apologetic look on his face, and said: "...Let's go to another day, I have an appointment to have dinner with my friends."

Li Zhi frowned unconsciously, and blurted out: "Xiao Wei?"

"Ah?" Lin Chaosheng was taken aback.

Li Zhi was also a little surprised, because of the unhappiness that suddenly surged up in his heart just now.What does it matter to you who he eats with?Li Zhi asked himself secretly.

"No, it's the senior I helped substitute for." Lin Chaosheng explained.

"Ok."

Li Zhi rubbed the two coins in his pocket, and decided to go to the bus stop not far away to take the bus back to school, "Then I'm leaving."

"it is good."

After walking a few steps, Lin Chaosheng called him again, "Li Zhi."

Li Zhi turned around in response.

"Go on." Lin Chaosheng threw something at him.

He caught it with both hands, spread his palms, and saw clearly the very Q font on the light pink package—lychee flavored marshmallows.

Li Zhi understood that this should be something that the little girl stuffed into Lin Chaosheng's hand before leaving.

A few steps away, Lin Chaosheng stood in the orange sunset and smiled at him: "Be careful on the road."

Li Zhi was taken aback.

Chewing lychee fudge in his mouth, the air is also full of sweetness.It’s really sweet, clusters of sweet-scented osmanthus are in full bloom on the shore of the lake on the campus, which looks extraordinarily bright in the twilight that is about to disappear.The temperature has become a bit cooler, and the clear air is filled with the aroma of sweet-scented osmanthus and the sweetness of lychee fudge.

Li Zhi sat on the stone bench by the lake for a while, when a light rain suddenly fell from the sky, fell into the lake water and disappeared instantly.He raised his head, and there seemed to be sweetness in the wet rain.

At this moment, Li Zhi felt a slight dizziness again.This time there was no alcohol effect, so he couldn't say that the lychee candy was intoxicating.