(Wow,It's really uncomfortable.,I'm coding words.,Just after updating Chapter 54.,It's suddenly disconnected.,No network!No network!But I still have a chapter that hasn't been updated.,Chapter 2 I must update.,So 21212 took out my 20 cm big ...... Mobile phone, finished this chapter with a mobile phone code, respectfully, I hope everyone will smile (? ̇▽ ̇?) ）

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If Polaris is far away from Earth, that's too far.

It's much farther than Sissi said about Mars.

Ye Xuan knows that Mars is only 0.55~400 million kilometers away from the Earth, and Polaris is more than 400 light-years away from the solar system where the Earth is located.

"No, no, baby, Polaris is far, far away from us, a distance we can't reach. Ye Xuan shook his head and replied.

"Huh?"

Sissi was stunned.

"Dad, we human astronauts can go up to the moon, why can't we go to Polaris?" Yuzu seems to be a little unconvinced, obviously the moon can go up, why can't Polaris go?

"Baby, the moon is only 380,000 kilometers away from us, and with our current technology, it is possible to land on the moon, but the North Star is so far away, it is more than 400 light-years away. ”

Ye Xuan hurriedly explained to his baby daughter.

"What is a light year?"

This time, it was the turn of the cute and silly Xiaoxin to ask.

"Baba, is light-year a distance?"

Sissi doesn't know what a light year is, but based on what her dad just said, Sissi deduces that a light year might be a distance.

Ye Xuan smiled and nodded, gently touched Sissi's little head and said: "Sissi is so smart, a light year is a distance unit, a very large distance unit, we often move at the speed of light for a year, and that North Star is more than 400 light years away from us." ”

Ye Xuan pointed to the North Star in the sky.

"Wow, that's a long way off. Yuzu couldn't help but sigh.

"Baba, is light fast, faster than a car?" asked Sissi a lot of questions that she didn't know.

Ye Xuan is also very patient to teach these little knowledge to his baby daughter, the speed of light and the speed of a car, which is not comparable at all.

The speed of light is a very abstract speed, the fastest ever known to man.

"Baby, the speed of light is the fastest speed we know, and none of our human vehicles can reach the speed of light, which is about 300,000 kilometers per second. ”

Ye Xuan knew that the baby daughters might not be able to understand the speed of 300,000 kilometers per second, but Ye Xuan only needed to let the baby daughters know that the speed of light was very fast.

Maybe the clever Sissi will be able to remember this data.

"Wow, that's fast, so fast. ”

Yuzu exclaimed again.

And Xiao Xin was already very confused when she heard it.

For Sissi, this knowledge seems to be like a new field, which makes Sissi a little excited.

"Dad, when I become an astronaut in the future, I'm going to go to the North Star. Yuzu suddenly said with great ambition.

"Yuzu, you can't go up. ”

Sissi said to Yuzu.

"Why? When I become an astronaut, I can build a spaceship faster than the speed of light and fly to Polaris in a few days. ”

Yuzu fantasized very much.

Ye Xuan couldn't help but smile, then squatted down and hugged Yuzu and said: "Baby, a spaceship faster than the speed of light does not exist, even if many years in the future, many years later, human beings have mastered the technology of sub-light speed flight, then it will take more than 400 years to go to the North Star." ”

Ye Xuan told his baby daughter Yuzu about the reality.

It's good to have fantasies, but it's impossible to realize this fantasy of Yuzu.

"I'm going, so I'm going to invent a ship that will go to Polaris with a whoosh. ”

Yuzu is so stubborn.

Ye Xuan smiled helplessly, she couldn't convince Yuzu anything, just let her fantasize like this, when Yuzu is a little bigger in the future, she will naturally understand that the fantasy at this time is actually quite naïve.

"Yuzu is so powerful, can you take me to the North Star?"

Xiaoxin came to Yuzu's side, took Yuzu's little hand and asked.

"Hee-hee, of course you can, I'm going to take my parents, and Sissi and you, and we'll go to Polaris together. Yuzu said wistfully.

The grandmother and grandmother on the side laughed kindly after hearing this, and said to Yuzu: "Yuzu is really promising." ”

"I'm going to bring my grandparents and grandparents with me. Yuzu said innocently.

"Where are you going to take us together?" At this time, the old father-in-law Han Delong and Ye Jianguo, the father of Ye, came over, and happened to hear Yuzu's "lofty ideal".

"Grandpa, grandpa, Yuzu is going to take us to the North Star. Xiaoxin happily clapped her little palms.

"To the North Star?"

Ye Jianguo and Han Delong were stunned.

Polaris is naturally known to these two older generations who like astronomy, and Yuzu wants to take everyone to Polaris together, which is really bold enough.

"How do you get to Polaris with Yuzu?" asked the old man, Han Delong, who squatted down and picked up Yuzu.

"I'm going to build a spaceship, a spaceship that flies very fast. Yuzu replied with a smile.

"Good baby, no matter how fast you build a spaceship, we won't be able to reach the distant North Star. ”

"Grandpa, why?"

"Because the North Star is so far away, so far away that we humans seem to be within reach, but we can't reach it......"

Yuzu was discussing with her grandfather over there the topic of why she couldn't go to the North Star, and here Sissi came over to take her father's hand and raised her head, her round eyes were full of curiosity.

"Baba, why do you say that Polaris is called Vega, the two names are different. Sissi's questions are easier to answer, more realistic.

"That's because Vega is the ancient name of our Huaxia Kingdom, the founder of the North Star is the Suiren Tizi clan, so it is also called the Purple Palace, the heroine of the Purple Palace is Yin Dexing, which is the Nine Heavens Xuannu of the Virgin of Tizi, so later the North Star was named Vega Star because of the Tizi Weaver Girl, which is derived from the nature worship of the ancient stars of our people in ancient times. ”

Ye Xuan explained in detail to his baby daughter Qianqian why Polaris is called Vega.

I'm sure the clever Sissi will understand.

"Oh, that's the case, our ancestors are really powerful, and they knew how to name the stars at that time. ”

Sissi looks like she admires her ancestors very much, and she is particularly cute and charming.

"Baby, if you find a star that we humans don't know in the future, you can also name it after you. ”

"Baba, is it real?"

Sissi asked in surprise.

"Of course it's true. Ye Xuan nodded: "However, there are already many stars that we humans know, and it is generally difficult for ordinary people to discover unknown stars." ”

"What if Sissi is lucky. Sissi said with a smile.

"If you're lucky, you'll have a Sissi star. ”

"Hee-hee, Sissi. ”

"Little Xinxing. ”

Suddenly, Xiao Xin on the side also said happily.

"Little star?" Sissi looked at her sister Xiaoxin suspiciously.

"Little Xinxing. ”

"Little Star?"

"Yes, Xiao Xinxing, hee-hee. ”

"That's a big star. Sissi said, pointing to the North Star.