Tang Yue stopped what he was doing, "Girl, you have to believe in us, rescue ......"

"Rescue will arrive in time, right?" Mai Dong said, "You've told me this many times. ”

Tang Yue was speechless, he did say this sentence too many times, he no longer knew whether this was to cheer up Mai Dong or encourage himself, no one knew if the rescue would arrive in time - according to the routine rules of Hollywood movies, this cargo spacecraft must have arrived, and it arrived at the moment of great crisis, saving the little girl at the last moment when the space station was about to crash, the male and female protagonists successfully converged and ushered in a happy ending.

But reality is not a movie, and there has never been a perfect ending set in advance by the screenwriter.

The principle of mediocrity is ubiquitous in this universe, and any outcome is normal and reasonable.

The old cat banged on the stretcher with a vise, it didn't want to say anything, and if it didn't make any promises, it didn't have to bear any responsibility, but Tang Yue kicked it.

"Ahem...... Miss Mai Dong, I will teach you a rough way to judge the height of the orbit. The old cat cleared his throat, "Can you see the plains of Ihidi now?" Or Endeavour impact crater? Gael's crater? Victoria crater? Whatever the pit, find a reference directly below you. ”

"Hmm...... Endeavour impact crater...... Endeavour impact crater...... Let me look for it, it should be on the meridian plateau, and the meridian plateau is near the equator...... I can see it, I can see Endeavour Pit, Mr. Cat. Mai Dong replied, "Mr. Cat, can you hear me?" ”

"Roger, Miss Mai Dong, can you find a pencil or a ruler over there?" If you really can't find it, take off the gloves of the spacesuit in the cabin and give your thumbs up. ”

Mai Dong looked left and right, reached out and grabbed a pencil floating in front of him, and opened the cap, "Mr. Cat, I have a pen in my hand." ”

"Okay, now listen to me, follow my instructions - straighten your right arm straight forward and put that pen up." The old cat instructed, "Close your left eye again, and use your right eye to keep the tip of the pencil so that the tip of the pen coincides with the left edge of the Endeavour impact crater, and be careful to make sure that the impact crater, the pencil and your right eye are three points and one line, do you hear clearly?" They must be in a straight line. ”

The girl held the middle of the pencil, as the old cat said, straightened her arm, held it straight in front of her, closed one eye, and slowly turned her body so that the tip of the pencil pointed at the shadow on the edge of the impact crater on the land of Mars.

"OK, Mr. Cat."

"Now open your left eye, take care to keep your body, arm, and pencil moving, close your right eye again, and use your left eye to look at the tip of the pencil." The old cat said, "Tell me where the tip of the pen is now?" ”

"Hmm...... It pointed to the center of the Endeavour impact crater. ”

"Alright." The old cat nodded, "It's okay, Miss Mai Dong, you can open your eyes, the current altitude of the Mars Joint Space Station is about one hundred to one hundred and twenty kilometers." ”

Tang Yue and Mai Dong were stunned.

Tang Yue stood on the side and watched the whole process, watching the old cat use a pencil to open and close his eyes like a trick to get the altitude data of the space station, and he couldn't help but be a little curious.

"How did you figure it out?"

"This is a very old means of ranging, known as the 'jumping eye method', which was commonly used in artillery ranging to targets before the invention of advanced optical sights and radar." The old cat explained, "The principle is actually very simple, just use eyes, pencils and references to build two similar triangles, ordinary people's eyes are about six centimeters apart, and the length of the arms is sixty centimeters, this is a triangle with a height to a base of ten to one, and a triangle similar to it must also have a ratio of ten to one." ”

"We used Endeavour crater as a reference, the Endeavour crater is twenty-two kilometers in diameter, and the pencil tip moves half the diameter of the crater, which is twelve kilometers." The old cat continued, "The base of this great triangle is twelve kilometers, so its height is one hundred and twenty kilometers...... This is the distance between Miss Mai Dong and the ground. ”

Tang Yue was a little surprised, the surprise was not the eye-jumping method, but the fact that this cat actually knew the altitude of the United Space Station, it had always known how to measure the height of the orbit, but it had never told itself.

"The current altitude of the Joint Space Station is located in the upper atmosphere of Mars, which is the bottom of the ionosphere." The old cat said.

"Am I already in the atmosphere?" Mai Dong asked.

"The atmosphere in name is actually nothing different from a vacuum." "The density of the atmosphere will not increase significantly until it is below 60 kilometers, so this altitude is relatively safe, there is enough buffer space, and I think it is entirely possible for the space station to last until Tianzhou 37 arrives." ”

The old cat's promise is more reassuring than Tang Yue's, because Tang Yue's encouragement is only based on a certain kind of self-confidence, and its theoretical basis includes, but is not limited to, "man will win the day", "where there is a will, there is a way", and "people's subjective initiative is the driving force that determines the direction of history" and other ancestor-level philosophical ideas, these things are okay to shout slogans, and it is sheep epilepsy to calculate orbital dynamics problems.

But the old cat is different, everything it says must be based on rigorous mathematical and physical calculations.

Now Mai Dong needs not slogans, but calculations.

The girl breathed a sigh of relief, and although the eye-jumping estimate was very sketchy, it was still the only reassurance they could take in a desperate situation.

"Thank you, Mr. Cat."

The old cat stopped talking, and then he buried himself in twisting the screws on the stretcher, and the force was so great that he screwed the screws to death, as if he had a grudge in his previous life, and then the old cat pressed the frame of the stretcher hard, confirming that it could bear the weight of an adult, and this time it did not fall apart again.

"I told you a long time ago that help will arrive in time." Tang Yue also breathed a sigh of relief, and now he has the confidence to say this, "Your life is still very long, girl, you still have a lot of things to do, you can have a happy and meaningful life, the future life may be very boring and monotonous, after all, Kunlun Station is indeed not a good place, but I believe you can still find happiness in it." ”

"Promise your good words." Mai Dong smiled, "If I can go down, then I will take wedding photos with you." ”

"I'm not kidding." Tang Yue pouted, "The joke of the wedding photo can be stopped." ”

"I'm not kidding."

Tang Yue made a move and suffocated.

"Really, I'm serious......" The girl looked at the Martian earth under her feet, raised the pencil in her hand, closed one eye, and said in a sly tone, "Tang Yue, if I can land safely, let's get married." ”