"What have they been up to these two days? It seems to be something very professional. ”

"Yes, Elder, it's about the comet."

"Is there any more detailed information?"

"Elder, for such a highly professional thing, we people in the Armed Security Department always don't know the essentials. I'm so sorry...... I don't know if you can give us a hint? ”

The hobbit yawned and said, "Maybe...... They're doing a serious job. Just pay close attention. Isn't there any news from Watson yet? ”

"Elder, now our eyes are also black, but we have noticed that the great leader of Yelu will go out every day."

"Well, you're getting smaller...... You don't seem to have a good voice, but I didn't call you at night. ”

"Nasty!"

The second meeting on the comet.

"The comet's orbit is elliptical, parabolic or hyperbolic, and because of its special shape, when it is far from the Sun, it appears as a small glowing cloud-like speck, and when it approaches the Sun, it drags out a long tail. This is due to the sun's light pressure and particle radiation driving out the gases, dust, and water in the coma. ”

"To put it simply, you just say this comet, what kind of temperament is it?"

Antowanvsky flipped back more than twenty pages of his carefully prepared report to the meeting, and said, "This comet has only one cometarytail -- the big chief, you know, some comets have as many as six comet tails, in that case, the rate of consumption of its body is enormous -- this little comet flying towards us has a total mass of only 1/25 of Halley's comet, and its density is about 1 gram per cubic centimeter." ”

"Isn't that the density of water?"

"No, Great Chief, it was originally less dense because it was a whole block of ice. It's just a little mixed with impurities. ”

"Its speed?"

"Based on the length of its tail and the reduction in the diameter of its head, its speed is about 56 kilometers per second, and it has just entered the solar system. The distance between the sun and the earth is 145,490,000 kilometers, so if it gets here, it will take a whole month. ”

"Who's going to calculate what the overall water content of this little comet is?"

One expert came up with a formula on a laptop computer and soon figured out, "400 billion tons of water, but by the time it gets here, there won't be so much, and about 75 billion tons will be lost." ”

"That's 325 billion tons, which is only 1 billion tons less than the total amount of water in the oceans of Earth1." Yelu Zhousheng said.

Antoine asked in surprise, "Great Chief, what is the use of your comparison?" , even if the common gravitational pull of the earth and the moon can't completely capture it, it will still pass by! If only the tail part of the comet is harvested, the amount of water is negligible. ”

"Are you talking about the gravitational pull of Earth 2 right now? We can try to increase its gravitational pull to its previous level. ”

"Great Chief, interlacing is like separating mountains, so I don't know what you can do to improve the gravitational pull of Earth 2. However, even if the gravitational pull of Earth-2 is raised to the previous level, plus the Moon's, it is only 1. 25 gravity - we still can't do it, it's almost impossible task. ”

Yelu Zhousheng said, "Think again. ”

All the experts, including Antowanski, thought for a while and shook their heads.

"What if we find a way to break it?"

The experts suddenly realized, "How did we not think of it!" Here's the way. If you were to turn this large comet into dozens, or even hundreds, of smaller individuals, it would be possible to do so almost with the gravitational pull of Earth-2 alone. ”

Then another expert shouted, "No! Are we going to use the moon to hit it head-on? It's something we haven't tried since we lived on the moon! ”

Antowanvsky said, "Great Chief, our moon has a good external protection system, its eight-kilometer-thick monolithic hard shell made of nickel-tungsten alloy, with good thermal conductivity, can conduct the temperature of the shell to rise or fall by 180 degrees in one hour; It also has good seismic performance, and the impact energy generated by the impact of a small meteorite on a certain point will be quickly and evenly spread to the entire lunar surface in a spherical surface. However, we are facing a huge ice hockey ball weighing 325 billion tons and traveling 56 kilometers per second! That's tantamount to a super cannonball! We've always said it's small, and that's only for Halley's Comet! ”

"Haha, when did I say I was going to hit it? Did I say that? Yelu Zhousheng smiled.

"That ......"

"I know that when our ancestors put such an advanced aircraft in our hands, they prepared a weapon for it -- a space nuclear cannon."

Antowanvsky's face flushed, and he said, "Great Chief, you know, we have been away from Earth 1 for more than 500 years, 562 years to be exact. During this time, we have had at least 18 generations on the moon. Those who were the first to set foot on the moon also became our ancestors, and we didn't even know that there was such a thing on the moon. Nor have I ever heard of a record of its use...... Not to mention how it performs now. ”

One said, "Before, we were a little puzzled by the fact that the Elder had recommended you to be the Great Leader when he was alive. I beg your pardon for thinking that there was an element of Miss Hejing in this. Now I understand, understand the real reason why you are the Grand Leader of our Moon Dwellers! I also have a stronger respect for Elder He! ”

"Thank you for your comments on Elder He, who is also my father-in-law, and it makes me feel the weight of the burden on my shoulders. We have survived on the moon for 18 generations, and each generation has done their part to shelter the elders of the previous generation and the children of the next generation. I think there is a once-in-a-lifetime opportunity coming our way, and what we have to do is not to find a reason, but to find a way to get as close as possible to our goal. ”

"Great Chief, all you have to do is tell us what to do!"

"With Antowanvsky as the team leader, make full use of the Yamada and lunar observation platforms, closely track the trajectory of the near-moon comet, activate the moon if necessary, attract it to low-earth orbit, calculate the angle of shelling and the position of the shelling, and the best goal is to let those pieces of broken ice fly to the earth on their own2, and that's it."

"Great Chief, we understand!"

"Space Nuka, I will arrange another professional to inspect it, and if there is a problem, it will be repaired within 29 days...... Everyone can split up. ”

After the meeting, Yelu Zhousheng and He Jing returned home, he was very serious, waiting for the moment of the ban. He has to give Big Brother Watson and his expedition team one final task: to gradually activate the geocentric power from now on. At the moment of the comet's arrival, let the geocentric dynamics reach the maximum that the earth's crust can withstand under the current conditions.

He looked at the time and waited......