When waiting, it feels like the time is always very long, and the four of them have nothing else to do, but this state only lasted for three days, Liu Xuan was called back to the Star Ring Company alone, and the propeller system of the Star Ring Company still needs professional personnel to debug, and Liu Xuan is the best choice in the Star Ring Company.

For the future victory of the Federation, Liu Xuan had no choice but to rush back. His three partners couldn't go back with Liu Xuan because they had other things in space, and Liu Xuan could only let Zhang Tianxue give him another ride, Zhang Tianxue had no objection to this, and drove the flying machine to send Liu Xuan back to the Star Ring Company.

Liu Xuan's three companions didn't stay to play, they also had their own missions, after all, they had been to space many times, and only this time they had time to do some other things. For Wang Meng, he naturally wanted to stay and really fly a new type of flying machine that only the Federation had, which was also approved by Linge. Xuan Mu also wanted to take the opportunity to study the real environment of space to further transform his hibernation system, after all, the original hibernation system was only used on the ground, and the liquid would not fly all over the sky. As for Qin Ming, there are many free antimatter ions in space, and people have already determined that they have been studied, but there is no way to collect these ions and reduce them to antimatter. If this thing is solved, the preparation of antimatter is very simple, and long-range antimatter navigation is very possible.

When Liu Xuan returned to the ground, he immediately entered the assembly workshop of Transwarp Company, where small parts were produced and then assembled in the final place. This matter is simple, but the accuracy of these parts must reach a certain level, and Liu Xuan's role is to adjust these automated machines so that the accuracy of the parts they produce can reach the required level.

So, for this reason, Liu Xuan's plan to rest for five days was completely ruined, just debugging these machines, Liu Xuan spent a full four days, not counting the time spent on the road by flying machines. Liu Xuan boarded the aircraft to the Guardian almost immediately after the commissioning was completed.

Back on the Guardian, Liu Xuan just relaxed for a few hours, and Commander Ringer sent an internal message through the bracelet, which was already very close to the calculated collision time. He asked Liu Xuan to hurry up and gather in the research room, and Liu Xuan and the other researchers wanted to watch the process together.

Liu Xuan contacted his friend through the bracelet, and then walked towards the research room tiredly, Liu Xuan was still very nervous at this time, he was afraid that his guess would be wrong, and human beings could only choose the last way to fight, but now it is useless to be nervous, and the most important thing is to get the final result.

When the four of them arrived at the research room, all the researchers with some qualifications sat upright in their seats, looking at the large screen floating in the front, quietly waiting for the final collision to begin. Liu Xuan originally wanted to find a place to sit down in the back, but he was specially requested by Ringer to be at the front, almost sitting side by side with Ringer, so Liu Xuan was also a little more restrained.

After getting familiar with it for a while, Liu Xuancai shifted his gaze to the big screen in front of him, this time the angle was unexpectedly good, because there was a collision near Saturn, and the Saturn probe at this time was already ready to be in place below, just below the two colliding objects. The angle is definitely even better than last time.

Just when Liu Xuan just sat down, two shadows appeared on the big screen, that is, the two objects that were about to collide, the meteorite missile and the starfall, this time the calculation was quite accurate, according to the current state of visual inspection, the two should collide in the middle of the lens, this is still a very good news for Liu Xuan, after all, this can be observed more carefully, can be prepared for future plans, even if his guess is unsuccessful, it can also be more detailed to photograph the true form of the starfall.

The two are close to each other, and the contrast at this time is more obvious, because it was an interstellar missile last time, it exploded very quickly, and human beings have not yet had a very intuitive feeling of the size of the starfall, but now that it is compared, Liu Xuancai found that this starfall is really big, at least ten times the size of the interstellar missile they launched, at this time, the meteorite missile in front of it is like a small pencil hitting a large marker, and the impact on the eyeball is quite large.

Just when Liu Xuan was still thinking, the meteorite missile accelerated directly and collided directly in front of Starfall. This is a program that Liu Xuan and they have designed a long time ago, and they are afraid that the speed between the missile and Starfall will not be enough, so they deliberately designed the final acceleration program, and the start of this program means that there is about to collide.

A minute later, the two objects on the video finally collided together, just for a moment, the meteorite was crushed into pieces by the huge speed, but at this time, the scene they were looking forward to finally happened, just like putting metal sodium directly into the water, a strong chemical reaction broke out between the meteorite and the starfall, because there was no oxygen in outer space, so there was no obvious flame, but a lot of bright light was produced.

Many of the rocks that jumped on the starfall also reacted rapidly, and the reaction was very violent, and the strong light even obscured the lens of the camera, and the large screen in front of them was already filled with white light, and the starfall was almost invisible.

After waiting like this for ten minutes, they finally saw Starfall's current state, and there were some small holes all over his body, and each hole looked like it had been corroded, which was very miserable.

The whole research room was stunned for a moment, and then cheered directly, Ringer also stood up and gave a standard military salute to Liu Xuan, and the other researchers also came over to shake hands with Liu Xuan and congratulate them, they finally verified Liu Xuan's idea, Liu Xuan's discovery is feasible, the magical shell of Starfall actually has such special properties, if Liu Xuan and their probe discovered this situation, they still have no way to attack Starfall.

Now they can summarize the characteristics of the starfall magical shell, which should be a material unique to alien civilizations, almost 100% defense against explosions and impacts, but will react with rocks, or trace amounts of special elements such as iron and nickel. Looking at the situation just now, if it is really launched to the edge of the earth and reacts with the rocks on the earth, you can imagine how tragic it will be, although it will not directly exterminate the creatures on the earth, but the large-scale lethality is comparable to antimatter weapons.

Liu Xuan is naturally very happy at this time, human beings finally have their own means to block the invasion of this terrifying alien civilization, to say that the original Liu Xuan has no confidence in the war in a few years, but now it seems that who will live and who will die is still uncertain.

This video was quickly sent to the Federation, and after the Federation watched it, it first gave Liu Xuan a lot of praise, and then directly released the video to the outside world.

The rest is to summarize and carry out the next step of the plan, the summary is set for the evening, and the main explainer is still Liu Xuan.

In a small conference room on the Guardian, it was full, and some people even stood and waited for Liu Xuan's speech.

Liu Xuan appeared on time, but at this time, Liu Xuan was still the same as usual, there was no change in appearance, he was still very ordinary clothes, and he didn't even wear a tie, but all of this was unimportant, this was the image in the eyes of these researchers, with a genius-like mind and a unique dress.

"First of all, congratulations to everyone, God bless my earth civilization, we finally discovered the weakness of Starfall, I think everyone has seen the video of that collision, I won't play it here again, just talk about my discovery."

Then Liu Xuan cleared his throat and began to speak, which was preceded by a very simple and direct explanation, just a detailed explanation of the characteristics of the starfall metal, as for the naming, the Federation finally named this magical metal Ulu, that is to say, the main material that makes up the starfall is Ulu metal.

Just like there is a providence in the dark, the earth civilization did not expect that their casual name was actually unified with the name of the alien civilization, I have to say, this is really too much of a coincidence.

Of course, Liu Xuan also analyzed several more pressing issues.

"According to the video research, we found that in the whole reaction, it is actually more meteorites, probably three meteorites are needed to consume one Ulu, as for the volume of the starfall, everyone also clearly sees it, if you really want to completely consume the starfall, the minimum estimate is also five huge asteroids, at this time there are still six days before the starfall approaches the asteroid belt, these six days, we have to rearrange the position of some asteroids, so that they are just in front of the starfall, if you really calculate, Time is still quite tight. ”

After Liu Xuan finished speaking, many researchers below also nodded, they also recognized this problem, but since they were able to discover the secret of this Ulu metal, they were not afraid of the lack of time.

"We need to do remote thruster maneuvering, mounting thrusters directly on the asteroid and then moving the asteroid's position." Liu Xuan also said his thoughts, which can be said to be the only feasible plan at present, but the only disadvantage is that more space propulsion needs to be mobilized.