Tang Yue sat on the roof of the Martian Stray Dog Experimental Module, watching the sunset set below the horizon, and in the same direction, the night and the starry sky slowly rose.

Tang Yue had heard the legend of Guiru, in the era when navigation technology and astronomy were not developed enough, the ancients thought that the earth was flat, and at the end and edge of the world, there was an endless huge waterfall, and the boundless sea water poured down from the cliff and fell into the never-ending void, which was really an unimaginable magnificent scene.

He tried to imagine Mars as a huge plane, if Mars was flat, then Tang Yue should be able to see the brilliant Milky Way rising from under his feet standing at the edge of the earth...... It would be nice if Mars was flat, so that he could look face to face with the universe without looking up.

It's too sore to lean your neck.

The old cat climbed up from the side and sat down beside Tang Yue.

One person and one cat sit in a row.

"How far have we come?"

"Ninety kilometers."

"How far is it?"

"One hundred and ninety kilometers."

"It's a long time...... It's really the longest road I've ever walked in my life. Tang Yue said, "What do you say is still supporting me to keep going?" ”

"Hope?"

"Not hope." Tang Yue shook his head and whispered, "Where is there any hope, in fact, you and I both know that this letter is not reliable at all, even if it is true, I will not be able to win the lawsuit, and I am not a lawyer, this battle is doomed a long time ago, and it is impossible for the earth to recover." ”

"What's that?"

"It's inertia." Tang Yue replied, "People and wheels are actually the same, if you push a wheel forward, even if it loses power, it will keep rolling down until the energy is exhausted and it can't fall to the ground, I am this wheel now, there is no power, but it is still rolling forward, and when it hits an obstacle and can't roll, that's it." ”

Tang Yue sighed, leaned back and lay down facing the sky, stretching his limbs into a large zigzag.

The old cat also lay down, also stretching its limbs in a large zigzag shape.

"Look at the heavens...... Is that a cloud? ”

"Yes."

Under the pitch-black night sky, Tang Yue saw extremely faint thin white flocculents, emitting a faint light, and they were moving slowly at a speed that was almost imperceptible to the naked eye.

"Are there clouds here too? It's really rare. ”

"Of course, there are clouds in the Martian atmosphere...... It's just that you don't usually pay attention, after all, there are trace amounts of moisture and carbon dioxide in the atmosphere, and the clouds you see may be ice crystals condensed by water, or dry ice condensed by carbon dioxide, but their height is much higher than the clouds on Earth. "It is distributed over the upper atmosphere of more than forty kilometers." ”

Tang Yue looked at the translucent cloud like rotten cotton wool, and suddenly felt that it was like an egg white mixed in turtle jelly.

Can't blame him for not paying attention to it, the presence of these clouds is too weak, Tang Yue can barely identify them in the dark background of the night, these extremely thin clouds float in the atmosphere dozens of kilometers above the ground, reflecting the sunlight is enough to be eye-catching, and the sunlight is strong during the day, no one can find them at all.

Weather changes on Mars tend to be subtle and slow, and if there is a weather forecast here, it should be sunny to cloudy tonight.

Clear.

Clear.

Clear.

Clear.

Clear.

Clear.

Tang Yue suddenly laughed, he felt that such a weather forecast was inexplicably funny, and one word could be used for 10,000 years.

"It's not always sunny, and there's a storm." Tang Yue suddenly remembered this stubble, the global storm on Mars blew for a few months and a half, which was really impressive, "The storm we encountered last time, won't it come again?" ”

"No, it won't." The old cat simply denied, "The last time we encountered it, it was an extremely rare small-scale strong convective weather, such a strong storm is one of the few in history, the formation conditions are very harsh, the probability is lower than five million in the lottery, you will encounter this time in your life, if you can meet it again, then you are the chosen one, and the responsibility of saving the world is none other than you." ”

"What about the global storm?"

"There is no need to worry about a global storm because it is cyclical and has a pattern." The old cat scratched his ears, "Don't be frightened by the word storm, the intensity of the global sandstorm in this ghost place is actually very low, and it is not as good as the smog in Beijing." ”

Compared to the severe convective microclimate, which is like a thunderstorm, global storms are much milder, they usually come and go slowly, and I go as gently as I come, and I wave my sleeves and bring a large cloud of smog – they come like the smog of Beijing.

In front of the Chinese who are accustomed to seeing all kinds of big battles, a mild Martian sandstorm is really nothing.

"The climate on Mars is very cyclical, and if you have a strong wind here this year, you may have another strong wind here at the same time and in the same place next year." The old cat said, "Got it?" Because global storms are cyclical, we can predict where they will come and where they will end. ”

"When is the next global storm?"

"A global storm is about once every three to four Martian years, and the next storm will come in the spring after a Martian year, which is two Earth years, or two years at the earliest, so you don't have to worry about it at all."

The old cat swears.

There will be a storm in two years, in the eyes of the old cat, it will definitely not affect Tang Yue, by that time Tang Yue has either gone or has hung up, they will call it a monstrous flood after they die, even if the wind lifts the ground, it doesn't matter, so the old cat can set up the FLAG as much as he wants, set up a happy one, and stand the FLAG high on Mount Olympus.

Let the whole universe see it!

"But......" Tang Yue hesitated.

"But what?" The old cat asked.

Its FLAG stands tall and indestructible, and no one should try to pull it out, because standing behind it is Newton, Joule, Pascal and Helmholtz! Predicting a storm is essentially a climate problem, and the climate problem is essentially a thermal problem, which is not a metaphysics like astrology, but rigorous and precise physics, backed by reliable data, and the old cat can boldly insert the FLAG all over the world!

"But...... You've seen this from the past, right? Tang Yue expressed the worry in his heart, "After the earth disappears, won't the orbit of Mars be affected?" Is the atmospheric heating and circulation still the same as before? ”

The old cat is stuck.

The eyeballs bulge.

No way!

I was wrong, I was wrong, I immediately went and pulled the FLAG from Mount Olympus!