The main material of the shell is glass fiber reinforced PEEK plastic, which is the so-called polyetheretherketone, which is an aromatic crystalline thermoplastic material, which is widely used in aerospace engineering, with high strength and high wear resistance, and can be used normally in the temperature range of minus 250 degrees Celsius to 300 degrees Celsius.

Tang Yueshen walked on the sand with one foot and one foot shallow, carefully checking around the Kunlun station, the air tightness of the main station can not have any problems, the atmospheric pressure of Mars is only 700 Pa, less than one percent of the Earth, and the standard atmospheric pressure of 101 kilopascals is maintained in the Kunlun station, if there is a crack and air leakage on the shell of the main station, then the entire main station may be blown up like a punctured balloon.

The weather was nice today and the sun was hanging overhead.

Tang Yue stroked the smooth outer wall of Kunlun Station, a white wall nearly three meters high and firmly anchored to the ground with straightened steel cables all around.

"Old cat, I have a question for you."

"Huh?" The old cat's voice came out of the headphones, "What's the matter?" ”

"Under what circumstances will the Earth blow up?" Tang Yue asked.

"The Earth will not blow up under any circumstances." The old cat replied.

"Then why did the earth disappear?"

"How do I know why it's gone? No matter how it disappears, it won't be blown up. The old cat shrugged, "If the earth is really blown up, do you know how much energy it takes to blow it up?" ”

"How old?"

Tang Yue stretched out his hand to pull the steel cable, Kunlun Station had six fixed steel cables, one end hung on the outer wall, and the other end was nailed deep into the ground with a long spike.

"We can make a rough calculation, the average radius of the earth is 6,370 kilometers, and the circumference of the equator is 40,000 kilometers, so according to the formula for calculating the volume of the sphere V=4/3πR∧3, the volume of the earth is about 1.08×10∧12 cubic kilometers." The old cat said.

"The gravitational acceleration on Earth is 9.8 m/s∧2, and according to the mg=GMm/R∧2 you learned in high school, as well as the circular motion formula, you can calculate that the density of the earth is about 5.5×10∧3 kilograms per cubic meter, which is a little more than five times the density of water." "So the mass of the Earth is about 5.97×10∧24 kilograms. ”

"That's 5970000000000000000000000000000000000000000000000000000000000000000000000000

Tang Yue didn't hear how many zeros the old cat said at all, and his mind was full of zeros.

"We can simply define 'blowing up the Earth' as 'accelerating all the matter on Earth to the first cosmic velocity, free from the constraints of Earth's gravity', that is, reaching a speed of 7.9 kilometers per second, and according to the formula for conservation of kinetic energy, it can be calculated that it takes at least 2.24×10∧32 joules of energy to do this."

"That's 2240000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Tang Yue: ......

"The energy released by the atomic bomb that flattened Hiroshima was about 5.5×10∧13 joules, which means that if you want to blow up the earth, you need 4×10∧18 little boy atomic bombs." The old cat finally gave the result, "This is equivalent to 6.5 billion people in the world, everyone carries 600 million nuclear bombs, and then everyone buries the nuclear bomb deep into the ground and detonates it at the same time to blow up the earth." ”

"Give mankind another 10,000 years, and mankind will not be able to build so many nuclear bombs."

Tang Yue: ......

"Take a step back and say, if anyone could blow up the Earth completely, then billions of rock fragments would be scattered throughout the orbit, forming an asteroid belt, or reconverging into a planet under the influence of gravity." "But as far as the observations are concerned, none of the above signs have occurred, and the earth has simply disappeared, without any remnants or debris...... This is clearly not blown up. ”

"So what's going on?"

The old cat paused, hesitated for a few seconds.

"The Earth is more like it has been erased, as clean as an eraser, and as far as I know, the only thing that can cause similar consequences is that a miniature black hole fell into the Earth." The old cat said.

"What?" Tang Yue was taken aback, "Black hole? ”

"A miniature black hole, let's say a black hole the size of a proton." "If you don't care about such a tiny black hole, it will quickly evaporate and disappear, but if you drop it on the earth, then it will continue to suck in the earth's material and sink into the center of the earth, and after inhaling the mass of the earth, the mass of the black hole will gradually increase, and it will become more stable." ”

"It's cleaner and doesn't blow up debris everywhere."

"The question is, where do black holes come from on Earth?" Tang Yue frowned, "Could it be that those people in Europe have gone wrong in high-energy physics?" Created a black hole with LHC? ”

"I didn't say that the disappearance of the earth must be caused by a black hole, don't be in such a hurry to put a hat on someone, the LHC can't create a black hole." The old cat shook his head, "The mass of the earth is so large, it can disappear out of thin air silently, this is obviously against the law of conservation of mass, according to the physics we have so far, the only possible cause is a black hole...... Because the black hole event horizon does not follow all the laws of physics that we know. ”

"But black holes are actually not right, if the earth is really sucked into the black hole, then in a short period of time there will be a huge amount of mass converted into energy radiated out, in our eyes, the earth may become as bright as the sun in a short period of time." The old cat thought about it and overturned the conjecture of the black hole.

"Black holes are also wrong, what should be the reason?"

"I don't know, maybe it's because of some natural phenomenon that is beyond our knowledge, such as a big filter that we have never heard of before." The old cat said, "It is also possible that some intelligent civilization beyond our knowledge did it." ”

Alien?

Tang Yue was stunned.

Aliens erased the Earth?

If you put it in normal times, Tang Yue must think that the old cat is talking nonsense, as a materialist atheist who grew up under the red flag, how can he believe in these ethereal things? But Tang Yue now has to accept this statement, the earth is gone, the most unthinkable thing has happened, what else is impossible? Maybe it was really a god-level civilization that was far beyond human imagination to do it?

Something like a god, sitting high in the galaxy, accidentally farted.

Oops, no, I had a bad stomach last night.

God thought silently, and then quietly looked around.

Well...... Everything is normal in the galaxy, it's okay, no one noticed that I farted, I didn't cause any damage, and I continued to sit and pretend to be cold.

The earth is gone.

People sit at home, and farts come from the sky.

"Alien bastards—" Tang Yue roared angrily, "I'm your uncle——! ”