Following. ◢ With *dream* small ◢ say щЩш.suimEnG

Twentieth mock test.

"Mr. Cat, Tang Yue, I'm already in place." Mai Dong put on an extravehicular spacesuit, re-sat on the command bench of the Eagle lander, fastened his seat belt, and closed all the protective covers of the portholes of the lander.

"This is Kunlun Station, Roger." Tang Yue replied, "Pay attention to keep the contact open. ”

"Orion II system computer offline."

"The atmospheric model has been modeled, the aerodynamic parameters of the lander have been modeled, and the navigation error has been corrected."

"The computer enters the EDL mode, the GN system is normal, the guidance control program is bound, the GN data is updated three minutes before entering the atmosphere, the radial altitude is 125 kilometers, and the distance between the fire center is 522 kilometers and the GN timing command EDL zero time is set."

"The communication band of the atmospheric entry band is switched normally, the UHF band signal is good, and the X-band signal is good."

The old cat sat across the table with a circle of monitors and keyboards around him, and he used them on all fours—literally, on all fours—literally, and the old cat sat with his ass tilted, and set the keyboard in the chair in front of him for his toes. I saw the old cat set of two-toed Zen, jumping like flying on the buttons.

"IU is normal, and the racemic command is triggered five minutes before entry."

"Mass trim, track angle adjustment, minus 11 degrees, angle of attack adjustment, minus 5 degrees."

The voices of the old cat and Tang Yue came and went in Kunlun Station.

In the words of the old cat, this test was a safe and secure test, and it took a long time to fix the control program of Orion II, staying up all night and working all day to ensure that every detail was foolproof. Physical tests they lacked the conditions and could only be simulated in virtual software, and the old cat set up the most demanding test environment just to allow as much room for rotation as possible for the real Orion.

The old cat is trying his best, and if it fails again this time, it doesn't know how to solve it.

Everyone and cat firmly believe that since it is theoretically feasible, then there must be a possibility of success, no matter how low this probability is, whether it is 1 in 10,000 or 1 in 100,000, as long as it exists, then no one can stop them from approaching this limit through repeated trial and error and correction.

No matter how low the probability is, there is a limit.

But human agency never ends.

This is what Marx said.

The old cat commented that the old man was only half right.

Because the subjective initiative of cats is also never-ending.

"The inertial coordinate system has been established, the Kunlun station is normal, the Orion spacecraft departments are normal, raptor-01, 0, 05, 07, 09 are normal, prepare for the countdown, all departments pay attention-"

Tang Yue raised his head and looked at the old cat over the monitor.

The old cat was burying its head between the computer monitors, and it noticed Tang Yue's gaze and nodded slowly.

"Miss Mai Dong."

"Hmm." The girl nodded.

The old cat and Tang Yue stood on either side of the table, staring at the screen of the monitor, Tang Yue raised four fingers and carried out a silent countdown, four!

The old cat sticks out three toes.

Three!

Tang Yue raised his index and middle fingers above his head and roared in the depths of his heart.

Two!

Thumbs up from the old cat, one!

Engine ignition!

The 745-second countdown begins!

Orion-2 Earthfire Transfer Spacecraft, Twentieth Re-Entry!

Five Raptor engines ignited at the same time, the scorching jets cut blade-like traces in the dark sky, violent vibrations were transmitted along the fuel tanks and metal trusses, and the huge fuselage of Orion II began to slow down, falling along the pre-set flight trajectory, and the huge overload pressed on the main structure of the spacecraft layer after layer, fortunately, the computer control was precise enough, and the central axis of the spacecraft did not deviate from the predetermined angle.

Gravity and the thrust of the engine compress the ship longitudinally, which is a challenge for the structural strength of Orion, the slender structure of the spaceship is very fragile in the gravitational field, and it will break if it breaks, so the old cat must let all the forces act along the longitudinal axis, and can only be subjected to pressure and not shear.

Orion II's computer began to alarm in a hurry.

Sensors throughout the spacecraft are reporting the force - this data is given by the workstation at the Kunlun station during the simulation test, and the old cat is simulating as much as possible, and this will also be the case when it actually lands.

In Tang Yue's words, at this moment, Orion is in a hurry, it can't be disturbed in any way, and no one can touch it, otherwise the strand of hair hanging with a thousand weights will break.

"1187746 meters above sea level, 4727 meters per second!"

"1150549 meters above sea level, 4591 meters per second!"

"106922 meters above sea level, 478 meters per second!"

Tang Yue's hands were supporting the desktop, he couldn't sit still, but he couldn't do anything, he could only stare closely at the situation of the spaceship, the old cat told him that this was the most sure simulation, because it had designed the program to be foolproof, and couldn't find any problems, if the test failed again, then even the old cat would be gone.

The altitude of the Orion II spacecraft is decreasing rapidly, almost all sensors are alarming, and the force on the spacecraft structure has completely exceeded the design limit.

"The density of the atmosphere is starting to grow, pay attention to the turbulence, pay attention to the turbulence - good, good! RS stabilizes the attitude and decelerates as expected! The old cat clenched his fists excitedly, "Steady...... Steady, bastard......"

Orion must slow down before the density of the atmosphere increases dramatically, otherwise the violent friction with the atmosphere will burn the spacecraft.

"The height is 9754 meters, 945 meters per second."

The old cat stared at the temperature and pressure sensors, the temperature in the temperature concentration area had risen to three hundred degrees Celsius, and some parts and coatings that were not resistant to high temperatures were beginning to melt, but this was within the ship's tolerance, and in the world of numbers and codes at the workstation, the Orion spacecraft was steadily descending.

"GN system data updated again, mass trim, track angle adjusted!"

"Code 1027 Alarm!"

"Code 1160 Alarm!"

Tang Yue's forehead was covered with cold sweat, neither he nor the old cat were powerless to change the fate of the Orion spaceship, and the only one who could save it was himself.

He and the old cat watched the spacecraft descend 10,000 meters and 10,000 meters, although the total time from re-entry to landing was only twelve minutes, but every second was extremely difficult for Tang Yue, he was afraid that the computer would pop up in the next second and tell him that the spacecraft had crashed out of control.

The Orion spacecraft descended with a scorching flame, the Martian atmosphere contains almost no oxygen, and what glows is actually volatile melted matter from the surface of the spacecraft, constantly covered with coatings or parts peeled off in violent tremors, but fortunately they do not affect the stability of the spacecraft.

The air is compressed into shock waves at high speeds, and during the landing process, this layer of plasma will isolate electromagnetic waves and hinder communication, which is called the "black barrier", but the speed of Orion is strictly controlled, and the situation of the black barrier is not serious.

"At an altitude of 578 meters, all departments pay attention and enter the high heat zone."

At an altitude of about 30,000 meters, Orion will experience the first life and death hurdle, and the temperature of the spacecraft's surface will rise to the highest at this altitude.

The structure and materials of each part of the Orion spacecraft are different, some parts of the power module can resist high temperatures of more than 2,000 degrees, but the command module can only withstand up to 400 degrees Celsius, in this case it is the short board that determines life and death, once the temperature of the Orion command module exceeds 400 degrees, then it will be burned immediately.

"2,580 meters above sea level." Old cat debriefing.

"The temperature sensor alarms, and the system computer dissipates heat abnormally." Tang Yue then spoke, "The outside temperature is 2 degrees Celsius. ”

"192 meters above sea level."

"55 degrees Celsius."

"1,541 meters above sea level."

"62 degrees Celsius."

"0274 meters above sea level!"

"75 degrees Celsius!"

The Orion spacecraft passed through the atmosphere against the scorching air, its engines roaring and slowing down as best they could.

"29,289 meters above sea level!"

"88 degrees Celsius!"

"9 degrees Celsius!"

"95 degrees Celsius!"

The data from the temperature sensor climbs all the way.

"98 degrees Celsius!"

"400 degrees Celsius!" The thermometer reached the top, touching the red line, and Tang Yue's heart shrank suddenly.

"Orion has successfully slowed down and broken through the high heat zone!" The old cat's words were a second late, and both one person and one cat held their breath, and the Kunlun station fell silent, and the icons on the monitor flashed regularly.

Although the spacecraft has been out of the hot zone, the temperature has just reached the limit of its resistance, and a catastrophe may be brewing in the silence, no one knows if the high temperature will cause the structure to melt and embrittle, and eventually lead to disintegration, no one knows if there will be a problem with Orion, whether it will pop up in the next second to report the crash.

Tang Yue clenched his fists.

The old cat pressed the headphones.

Half a minute later.

There was no alarm, there was no crash, Tang Yue and the old cat both saw that the temperature data began to drop, the Orion system computer self-test was normal, and the spacecraft fell steadily.

"The Orion spacecraft descended normally...... Normal drops! It survived! It survived! Tang Yue got up, excitedly held the old cat's shoulders, looked at the cat's eyes and laughed, "Hahahaha!" The kid persevered! ”

The 300th second of re-entry.

The Orion-2 spacecraft successfully broke through to an altitude of 10,000 meters.