The main body of the Kunlun station is a white hard shell, which is upside down on the surface of Mars like a big bowl. The main material of the shell is glass fiber reinforced PEEK plastic, which is the so-called polyether ether ketone, which is an aromatic crystal type.

Thermoplastic polymer materials are widely used in aerospace engineering. They have high strength and 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 shallow and one foot high, and walked around the Kunlun Station to carefully check that there should be no problems with the air tightness of the main station. The atmospheric pressure of Mars is only 700 Pa, less than one percent of the Earth's, and Kunlun

The station maintains a standard atmospheric pressure of 101 kPa. If there is a crack in the shell of the main station and air leakage, the entire main station may explode like a punctured balloon.

The weather is nice today, the sun is high overhead.

Tang Yue stroked the smooth outer wall of Kunlun Station. This white outer wall was nearly three meters high and was firmly fixed to the ground with straightened steel cables.

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

"Huh?" Lao Mao's voice came from the earphones, "What's the matter?"

"Under what circumstances will the earth explode?" Tang Yue asked.

"The earth will not explode under any circumstances." The old cat replied.

"Then why did the earth disappear?"

"How do I know why it disappeared? No matter how it disappeared, it was not blown up." Old Cat shrugged, "If the earth was really blown up, do you know how big it would take to blow up the earth?

Energy?"

"How big?"

Tang Yue reached out and pulled at the steel cables. There were six fixed steel cables at Kunlun Station. One end was hung on the outer wall, and the other end was driven deep into the ground with long nails.

"We can do a simple calculation. The average radius of the earth is 6,370 kilometers, and the circumference of the equator is 40,000 kilometers. Then according to the formula for calculating the volume of a sphere V=4/3πR∧3, the volume of the earth is about 1.08

×10∧12 cubic kilometers." said the old cat.

"The acceleration of gravity on the earth is 9.8m/s∧2. Based on the mg=GMm/R∧2 you learned in high school and the formula of circular motion, you can calculate that the density of the earth is about 5.5×10∧3 kilograms per cubic meter.

, that is to say, it is a little more than five times denser than water." The old cat continued, "So the mass of the earth is about 5.97×10∧24 kilograms."

"That's 597000000000000000000 tons."

Tang Yue didn't even hear clearly how many zeros the old cat said, his mind was filled with zeros.

"We can simply define 'blowing up the earth' as ​​'accelerating all matter on the earth to the first cosmic speed and breaking away from the constraints of the earth's gravity', that is, reaching a speed of 7.9 kilometers per second. According to the kinetic energy conservation formula,

It can be calculated that at least 2.24×10∧32 joules of energy are required to do this.”

"That's 224000000000000000000000000000000 joules."

Tang Yue:......

"The energy released by the atomic bomb that destroyed Hiroshima was about 5.5×10∧13 joules. That is to say, if you want to blow up the earth, you need 4×10∧18 Little Boy atomic bombs." Lao Mao finally gave

As a result, "This is equivalent to 6.5 billion people in the world. Each person is carrying 600 million nuclear bombs. Then everyone buries the nuclear bombs deeply underground and detonates them at the same time to blow up the earth."

"Given another 10,000 years, humans will not be able to build so many nuclear bombs."

Tang Yue:......

"Taking a step back, if someone could really blow up the Earth completely, billions of rock fragments would be scattered throughout the orbit, forming an asteroid belt, or they would reunite into a planet under the influence of gravity.

"Lao Mao said, "But judging from the current observation results, none of the above signs have occurred. The earth simply disappeared without any leftovers or debris... It was obviously not blown up."

"Then what's going on?"

The old cat paused and hesitated for a few seconds.

"It's more like the earth has been wiped out directly, as cleanly as if it were erased with an eraser. As far as I know, the only thing that can cause similar consequences is a miniature black hole falling into the earth." Old Mao said.

"What?" Tang Yue was startled, "Black hole?"

"A miniature black hole, for example, a black hole the size of a proton." Lao Mao explained, "Such a tiny black hole, if you leave it alone, it will quickly evaporate and disappear, but if you drop it on the earth, then

It will continue to absorb the earth's material and sink into the earth's core. After absorbing the earth's mass, the black hole's mass will gradually increase and it will become more stable."

"This method is cleaner and won't blow up pieces everywhere."

"The question is, where did the black hole come from on the earth?" Tang Yue frowned, "Did those people in Europe make a mistake in high-energy physics? Did they use the LHC to create a black hole?"

"I didn't say that the disappearance of the earth must be caused by black holes. Don't be so anxious to blame others. The LHC can't create black holes." The old cat shook his head, "How can the earth with such a huge mass be silent?

It disappears out of thin air, which obviously violates the law of conservation of mass. According to the physics we currently know, the only possible cause is a black hole... because the black hole's event horizon does not follow all the physical laws we know."

"But black holes are actually wrong. If the earth is really sucked in by a black hole, then a huge amount of mass will be converted into energy and radiated out in a short period of time. In our eyes, the earth may become like the sun in a short period of time.

Bright." Old Cat thought for a while and overturned the conjecture of black holes.

"The black hole is not right either, so what should be the reason?"

"I don't know. It may be due to some natural phenomenon beyond our cognition, such as a large filter that we have never heard of before." Old Mao said, "It may also be the work of some intelligent civilization beyond our cognition.

of."

alien?

Tang Yue was stunned.

Aliens wiped out the earth?

Normally, Tang Yue would have thought that Lao Mao was talking nonsense. As a materialist atheist who grew up under the red flag, how could he believe in these illusory things? But Tang Yue now had to accept this statement.

The earth is gone, the most unimaginable thing has happened, what else is impossible? Maybe it is really the work of some god-level civilization that far exceeds human imagination?

Some god-like thing, sitting high above the Milky Way, accidentally farted.

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

God thought silently, and then quietly looked around.

Well... everything is normal in the Milky Way. Fortunately, no one noticed that I farted. I didn't cause any damage. I continued to sit upright and pretend to be cool.

The earth is just gone.

When people sit at home, farts come from the sky.
Chapter completed!