Titan then captured a total of 3,000 tons of asteroids, but only one piece of Earth was missing.

Ruan Lin said at this time: "Wit, it's almost time to return." This harvest plus the Spirit Star is enough for us to build two comet-class ships. ”

"Okay, Dr. Nguyen. It's about to start full acceleration. Wit replied.

Ruan Lin wanted to return to Europa right now to begin dissecting this fragment of Earth, and he longed for the existence of familiar life on Earth. It will also make him feel a little less lonely.

The Titan gradually passed through Europa's atmosphere, and from this height it was already visible that the huge body of the Spirit Star was like a prey being eaten away, and even on top of its body there were digging robots at work.

WIT began the landing announcement: "The hovering landing device is on, and the Titan is currently 10 kilometers above the surface, and the capture module door has been opened. ”

I saw the capture capsule behind the Titan slowly open, and countless asteroids slipped out from the inside, smashing heavily into Europa's surface.

Ruan Lin is also very helpless at the moment, these actions may cause environmental pollution on Europa, if there is life in that fragment, maybe many years later, Europa will appear familiar Earth creatures again.

Ruan Lin said: "WIT, let a small group of excavation robots stop the work at hand later, and now the main task is to disassemble and analyze this fragment of the earth. ”

Ruan Lin's consciousness returned to his body, and he hurriedly ran out of the "Sun" base and rushed to the asteroid drop site.

I saw that a small number of robots stopped working, turned their heads and ran to the drop site with Ruan Lin.

Its color was so conspicuous that the digging robot soon began dismantling it. Ruan Lin just sat next to them, silent.

He suddenly sighed: "In the final analysis, it is still my feelings as an earth creature and a human being that are at fault. But I can't be an emotionless robot, and this will be the last time I'll do this. ”

The excavation robot sent the dismantled debris to the "Sun" base in waves. Ruan Lin always sat next to him in the same position until the fragments in front of him disappeared.

Ruan Lin began the analysis of specific substances. The results showed that the piece of debris may have come from the bottom of the Pacific Ocean, where the neutron star was on the western hemisphere of the Earth at the time. Although the Eastern Hemisphere does not face neutron stars, it is also a place of life, with all volcanoes erupting at the same time, which is why this fragment of the Earth still has magmatic rocks.

"It's... Water bears? They're still alive! Ruan Lin exclaimed at this moment.

Several of the tardigrades in the microscope have stopped moving and their bodies have shrunk, but this is only a sign of their cryptogenesis, and they may be resurrected if the surroundings improve.

They seem to have been born as a favored species, and they can resist countless harsh environments, even the radiation of the atomic bomb cannot kill them.

The idea of putting them on Europa's surface crossed Ruan Lin's mind for a moment. Perhaps this is their best destination, and although it is unfair to the protists under Europa's ocean, Ruan Lin still hopes that they can thrive here, they are the oldest creatures on Earth.

Ruan Lin decided to find an area on Europa that was not too cold and put them there, and it was up to them to survive or not.

It's been seven months since I've returned to Europa again.

In the past seven months, half of the mining progress of the Psyche has passed, and the iron ore of the remaining 3,000 tons of asteroids has also been collected.

Ruan Lin devoted himself to one thing - the space dock. This is a permanent plan.

He realized that it was impossible to lay such a time-consuming and laborious base for every planet, and that he had to have a spaceyard to meet his ship's production, and assemble the ship's parts on the surface and send them directly to the spaceyard through a space elevator.

Assembling in a shipyard significantly reduces the required costs. For example, the next two comet-class destroyers that need to be built can reach a length of about 600 meters, the widest point is nearly 200 meters, and the weight is at least about 160,000 tons.

The first step was to build a space elevator.

Ruan Lin learned through relevant knowledge retrieval that it turned out that in 2089, there was already a country that had successfully built a space elevator, but he was still on the Titan at the time and didn't know the news.

Ruan Lin then flipped through the blueprints of its design, which consisted of a cable connecting the planet to the space dock. The first thing I had to do was to build a pedestal on Europa's equator, because this would have the shortest distance to hang down from Europa's synchronous orbit, and this would also ensure the safety of the space elevator, since the eccentricity and inclination of the orbit were both 0.

Eight months later, all of the Psitron's minerals have been mined, and countless refining bases are working non-stop to refine fragments into usable raw materials. The space elevator base on Europa's equator has also been officially established, which is circular in shape and has a radius of 7 kilometers. The pedestal will hold the cable to Europa, and since Europa's gravity is only one-seventh that of Earth, there is no need to worry too much about breaking through the ice that is up to 25 kilometers thick.

The main cable of the elevator will be made of carbon nanotube composite cable ribbon, which is only a few centimeters wide and almost as thin as a piece of paper, but its bearing capacity should not be underestimated.

On the way to build, Ruan Lin is still considering what kind of driving force to use, the driving force of ordinary elevators on the earth is mainly electric motors and traction machines, and the two cooperate to form a complete lifting system. At present, the best adaptability should be the laser power system, if you borrow the rocket to propulsion, it is easy to cause the space elevator to be unbalanced, and the altitude of the synchronous orbital station will also decrease.

The space elevator's synchronous orbital station is located in Europa's geostationary orbit, about 16,000 kilometers above the surface.

The subsequent weights and cars were easy to manufacture, and they did not give Ruan Lin a headache.

The Sky Elevator, which uses all of Europa's available power, was completed 14 months later. By this time, the available inventory of all materials had been reduced by almost 30 percent.

Ruan Lin stood at the base of the space elevator at the moment, looking up at the sky, as if God had drawn a dividing line between heaven and earth, with no end in sight, straight into the sky.

Nguyen Lam decided to be its first passenger.

Since its propulsion is a laser power system, the lift cabin can operate almost 24 hours a day. The standard lift cabin is 20 tons, it is capable of carrying up to 13 tons of payload and has 900 cubic meters of space.

Ruan Lin stepped into the lifting cabin: "WIT! Commencement of the first operational trial. ”