The ion engines of the six ships emitted pale blue flames as they drifted away from Deep Space......

Under the vigorous dissuasion of everyone, Yu Yifeng did not play in person this time. He was just standing on the Deep Space observatory and watching the ships leave......

Half a day later, all the spacecraft centered on "Titan Z" and successfully reached the sky over "Dig-114", about 15,000 kilometers above the surface.

Then, they begin to slowly decelerate in order to reduce the height of the track.

If the plan can be successfully implemented, five "Leviathan" spacecraft will enter low-earth orbit 1,000 kilometers above the ground to carry out long-range remote control missions of unmanned machinery.

1,000 kilometers, which is equivalent to the distance between some artificial satellites and the Earth, produces an acceptable signal delay......

And "Titan Z", on the other hand, stayed on an orbit of three thousand kilometers.

It will be responsible for the processing of the relevant data, as well as the provision of the necessary fire support......

"Titan Z" is still a bit large in size and was specially designed for war. In order to maximize its combat capabilities, it looks like a spherical battlestar with a variety of complex weaponry.

But this complex construction also has certain limitations...... Like Deep Space, it can't land on planets.

"If Titan Z gets too into the deep well of the planet's gravity and wants to climb out, it's a bit of a struggle. It has its own ion engine, the power is not enough. ”

"If you look at it this way, should we design a large spacecraft that specializes in climbing deep gravitational wells?" Yu Yifeng couldn't help but ask in the captain's room.

"You mean...... A large spaceship that can land on planets? The manufacturing cost is too great, and there is no need for this! ”

"This kind of spaceship, all the structures have to be redesigned, troublesome."

Yuriko shook her head and said lightly, "You know, where gravity is strong, you can't use a curvature engine. According to our current theory, the spacecraft still has to be jetted in the opposite direction to get propulsion power......"

"The ion engine is spraying high-speed plasma, and in principle, it is still jet in the opposite direction...... Very low-end, isn't it? How much gas does a 100-million-ton large spacecraft have to spew out of the atmosphere! ”

Speaking of this, she smiled slightly: "So climbing the gravitational deep well, the space elevator is already a good choice." ”

Yu Yifeng nodded: "That's right, it's still very economical to convert potential energy with electricity...... So, what about some of the non-working fluid propulsion methods? Is there any scientific progress? ”

Yuriko thought for a moment and shook her head again: "Laser propulsion is the current mainstream of research, and it has been partially successful. But the impetus is not large, and it is difficult to lift up. Micro-motion is the same problem......"

"There is no working fluid to push, the cost performance is not good at all, we shoot a lot of high-energy laser backwards, but the recoil in exchange is only a little bit...... I don't think it's possible to replace the ion engine with working fluid propulsion, unless there is a theoretical qualitative change! ”

"Is it so difficult to push without working fluid...... Okay......" Yu Yifeng sighed.

Talking like this, the scientists ahead have made new discoveries.

Perhaps because of the war, there are scattered space junk in space low earth orbit, all of which are moving at high speed around the planet.

These space junks are very annoying things in aerospace engineering, because they have a certain probability of hitting spaceships and causing major accidents. They are more than ten times faster than regular bullets, so their kinetic energy is also much higher than bullets.

Although the human spacecraft has been reinforced in key parts, it will also be in trouble if it is hit by large space junk.

Therefore, the auto-defense lasers of each spaceship are all turned on......

"Space junk is never naturally generated, it can only be man-made!" All scientists see space junk as if they were treasures......

Then, in the pile of space junk, a spherical device similar to a communication satellite was observed, flying rapidly.

Its speed is about 7 kilometers per second.

One of the captains also reacted very quickly, and the moment he observed the satellite, he immediately said excitedly: "Capture!" Capture it! ”

With the captain's order, a highly maneuverable "Yuyan" broke out of the frigate and began to accelerate its flight, catching up with the satellite.

Upon approaching the satellite, the robotic arm throws a soft material that resembles an aerogel mesh to cut the satellite's velocity.

The satellite was smoothly covered, gliding inside for some distance, and finally slowed down, keeping pace with the ship.

Then, it was pulled back into the ship......

“…… Did you capture a satellite? ”

Deep Space is 900,000 kilometers away from the six spacecraft, and the images seen are all delayed by 3 seconds. Therefore, Yu Yifeng received the news 3 seconds later, and he frowned slightly.

If it were him, before capturing the satellite, it would be necessary to carefully inspect it to see if it was working properly to rule out some potential dangers.

So, from his point of view, this captain's approach was a little reckless......

However, he didn't say much.

The distance of 900,000 kilometers comes and goes, almost six seconds, and this delay is still too great for inconvenient command. Therefore, Yu Yifeng simply delegated most of the power to each captain in advance, and let them make their own decisions within the safety regulations.

This mission is also a training for the soldiers.

Except for the captain of "Titan Z" is Xu Yunjin, and the captain of the "Leviathan" below is Zhao Yao, the other four are all recruit captains.

In fact, it cannot be said that it is a "new soldier", but the kind that has never fought and seen blood......

There's no way, you can't always protect them, they have enough training, but the sense of crisis and mission experience are still seriously insufficient......

Soon after the satellite was transported back to the spacecraft, the first test was carried out.

It weighs about 560 kilograms, and a small hole has been punched out of the core by some kind of weapon, and because of this hole, it has become a pile of space junk, and no signal is released.

“…… The danger level should be low, and theoretically there will be no bombs or the like. ”

After assessing the risk, scientists immediately used a robotic arm to isolate and disassemble it to analyze its specific performance.

The first thing to analyze is the material system.

The results show that both metal and glass are the most conventional low-level space materials, such as titanium alloy, magnesium alloy, glass fiber reinforced plastic, etc.

Its level ...... Not even as good as the Knicks civilization!

"The material looks familiar...... Uh, didn't I say that we used it before, right? ”

"yes...... Isn't every civilization's tech tree the same? Several scientists wondered.

"To put it mildly, you'd like to have a unique tech tree come out...... This kind of underlying technology, maybe every low-level civilization is really similar. Only after reaching a higher level, with more and more development directions, will the unique scientific and technological ...... of civilization be formed" They analyzed,