Scholar’s Advanced Technological System

To understand the difference between the advantages and disadvantages of electric and chemical propulsion, we must first understand a concept that junior high school students understand, and that is acceleration.

On a short distance scale, because of the huge thrust of the chemical propulsion method, the spacecraft can reach a very high speed in a short period of time, so it is more advantageous in terms of flight time as a whole.

However, if the distance scale is enlarged to millions of kilometers, or even tens of millions of kilometers, it is another situation.

Although electric propulsion cannot be used in the same way as chemical propulsion, the working fluid can be erupted in a short period of time in exchange for huge thrust, but it can obtain a speed much faster than chemical rockets through continuous acceleration and a large specific impulse The maximum value.

Therefore, it takes 3 months for BFR rockets to travel to Mars across tens of millions of kilometers.

But for Xiaguang, which starts directly from the lunar orbit, one month is enough.

This is still in the case of missing the optimal launch window period of the Hörmann transfer orbit. If the relative position of Mars and Earth is exactly at the optimal launch position, it may not be necessary to complete a month from the moon to Mars even if it is not used flight.

In the deep and dark space, Xiaguang, the astronaut stationed on the Moon Palace station, and completed the supply of working fluid, is slowly separating from the Moon Station space station.

Sitting in the cockpit, Xu Zhenghong reached out and pressed on the helmet, reporting to the ground command center with a clear voice.

"Here is Xiaguang. We have completed all the missions and requested next instructions."

"This is the ground command and control center. Congratulations on completing all your missions. Now, please switch to cruise mode and wait for the next instructions.

"Received, switching to cruise mode."

Sitting in the co-pilot seat and watching Xu Zhenghong switching to cruise mode, Liu Biao asked casually.

"Don't return home directly?"

"Ground Command let us wait."

"Because those Americans?"

"Yes."

Speaking of this, Liu Biao couldn't help feeling a while.

About two or three months ago, they had met far away in the orbit of extraterrestrial space.

Before I could say hello, I watched them fly away.

I did not expect to meet again now, but in this form.

Silence continued in the cockpit for a short while.

As Xu Zhenghong closed his eyes halfway and was ready to sleep for a while, the signal light in the cockpit suddenly flickered slightly.

Liu Biao reminded: "Signal from the ground command center."

"Saw it," opened his half-closed eyes, Xu Zhenghong sat upright from the chair, reached out and pressed on the helmet, "Here is Xiaguang, heading to the scheduled airspace, preparing to switch routes ..."

"5, 4, 3, 2, 1 ... Ignite!"

The faint blue arc sprayed from Xiaguang's five electric propulsion engines, dragging the silver spacecraft, and heading towards the far-reaching starry sea ...

...

15 minutes ago.

In this dilemma, the White House finally made a choice. At the same time, the Chinese Ministry of Foreign Affairs received a phone call from the President of the United States, and in the call, the President of the United States formally requested a rescue.

Ten minutes ago, the news reached the Jinling Space Launch Center, and the staff who had finished the navigation work immediately returned to work.

At about the same time, Xiaguang, which was performing a mission in the lunar orbit, received the news and immediately started the preparatory plan. After the Lunar Palace space station completed the supply of working substances and living supplies, it calculated along the ground command center The waterway headed for Mars.

It took less than 15 minutes before and after the rescue request was received.

At this moment, the world once again witnessed the efficiency of China.

At the same time, the Lunar Orbital Construction Committee held a press conference at the Jinling Hotel and publicly reported the latest progress of the rescue operation to journalists from major media.

This move almost did not vomit blood from American gas.

What about low-key things?

How can you even invite a reporter!

Originally, the White House intended to deal with it in a low-key manner. As a result, it was not expected that the Chinese side would directly conduct a big fanfare. It was also a press conference and a real-time report on the progress of rescue to all sectors of society.

Especially the rescue plan that was launched within 15 minutes immediately made the staff at the ground command center of the NASA Ares Plan face red.

It took them three days to analyze the options and possible results, but none of the responsible people told them whether they would be saved or not, so that they missed the best window of launch.

As a result, Hua Guo did not make any budget assessment, and within 15 minutes, the channel was determined and a rescue team was dispatched, blasting them more than one street in terms of efficiency.

Although they also knew that the rescue plan was definitely not made in 15 minutes, it might have been prepared before that video call, or even three days ago.

But even so, this efficiency is enough to keep them out of reach.

Not only that, China ’s open, transparent, serious and responsible attitude in the “humanitarian” rescue has formed a sharp contrast with NASA ’s previous pushes from side to side, allowing all Ares to plan the work of the ground command center for a while. The staff, and those who supported the Ares project, felt complacent, and the direction of public opinion changed overnight.

[I am ashamed of NASA. 】

[Unbelievable, if not for the Chinese, we don't even know what our colonists on Mars have encountered? !! Is the White House planning to wait until their bodies have weathered before sending someone to collect them? 】

[A rescue team is dispatched within 15 minutes ... God, how is this possible! 】

[Don't tell me how difficult it is to rescue, I now seriously suspect that NASA has no intention of saving people at all! 】

[Until now, I do n’t know why the Diary of Mars stopped broadcasting, not because the communication cost is expensive, nor because of the sand storm on Mars, purely because our White House and NASA want to hide the truth ...]

In order to save face and at the same time show determination to take their own citizens home, after realizing the seriousness of the matter, the White House urgently announced that it would bear the entire budget of the rescue plan.

However, less than five minutes after the announcement, NASA received a bill from across the Pacific.

A total of $ 1.7 billion.

Support code scanning and installment payment.

After seeing this bill, Director Carson almost didn't get out of his internal injuries.

$ 1.7 billion!

Nima can rebuild a Xiaguang!

Is this his cash machine?

Just then, his assistant came over.

"Mr……"

"what happened?"

Looking at Director Carson with a poor face, the assistant hesitated for a moment, and then stopped talking.

"Bad news ..."

Looking at the mother-in-law's subordinate ~ www.readwn.com ~ Carson impatiently said: "Don't talk nonsense, hurry up."

"Yes!" Seeing the impatient expression of the boss, the assistant nodded quickly and said, "... just half an hour ago, we found on the official website of China Media China that there was also a documentary program there . "

Upon hearing this sentence, Director Carson suddenly hesitated for a moment, feeling secretly uncomfortable.

But where did this badness come from, he couldn't tell.

Opening his mouth, he asked with a reluctant voice.

"What documentary?"

The assistant smiled bitterly.

"It looks like ... Mars rescue."

Carson: "..."

With the exception of a Fack, he doesn't want to say anything now ...