The atmosphere is very important for living organisms. It also plays an extremely important role in ecological evolution.

What would the Earth be like if it didn't have an atmosphere?

It is foreseeable that life will not be born on Earth. Liquid water also cannot be retained and is completely evaporated by solar radiation. The surface of the earth will be scorched, with temperatures soaring to hundreds of degrees Celsius during the day and even minus 200 degrees Celsius at night.

The atmosphere is so important, but for Chen Yue, it means a little trouble.

Originally, it was because Ganymede had no atmosphere that Chen Yue chose to land the Glowing spacecraft on it.

This ever-thickening atmosphere caused Chen Yue to be a little worried.

Because at this moment, he has already begun to plan to develop his own space industry.

Chen Yue has always been very aware that Europa is just the starting point of his own development. When you grow stronger, you will definitely leave it and move your focus to the rest of the planets.

Europa is too small to carry Chen's dreams.

In order to fulfill our dream of developing and expanding and traveling in space, we must develop the aerospace industry. The ultimate goal of developing the space industry is to build larger and more advanced spacecraft.

A more advanced ship than the Glowing Spaceship.

"It should be fine."

Chen Yue comforted himself like this: "Before I move away from Callisto, its atmosphere should not thicken to the point where it can affect me. ”

However, this also gave Chen Yue a little wake-up call, making him realize that the aerospace industry must start as soon as possible.

So...... Let's launch a few satellites first.

The satellites originally collected from Mars have been in orbit for more than ten years now. Under the influence of Jupiter's radiation, nine of them have completely broken down and lost all functions. The remaining usable ones have long been dilapidated and close to being scrapped.

They can barely run at less than 10% of their power.

Among these satellites, resource exploration, terrain mapping satellites and the like, Chen Yue simply no longer use them. However, communication satellites are Chen Yue's rigid needs, and they can't do without them.

Or is it because Ganymede is too small. At a distance of only a few hundred kilometers, the curvature of the ground has increased to the point where radio cannot communicate, and if you want to communicate, you must either lay communication fiber optic cables or relay through communication satellites.

As for the communication fiber optic cable, frankly speaking, Chen Yue has not been able to manufacture it on a large scale, at most he can only make a little bit in the laboratory, and it is already the limit to use it in the most critical places.

Then you can only rely on communication satellites.

"Then let's develop a rocket."

Chen Yue thought so.

So, in the third ring and four vertical railway network, Chen Yue picked a place, mobilized a large number of robots to go over, and immediately started the construction of the factory.

This time, Chen Yue was ambitious.

Not only do he have to build rockets, but the rockets he makes must also be recyclable, and they must be air-space. That is, it can operate in a space environment and fly in near-Earth space.

Fuel, Chen Yue plans to use liquid hydrogen and liquid oxygen.

This thing is easy to make, and it is not as complicated as metamethylhydrazine.

There is a large amount of water ice on Callisto, which can be prepared by direct electrolysis.

The electronic control system is more complicated, but it has also been solved after using some high-performance chips from the Martian base.

The rest is material properties.

Difficulties do exist, but there is only one. That is the high temperature resistance of the rocket vent material.

Chen Yue had to ensure that the liquid hydrogen and liquid oxygen were burned violently, and the high temperature of the tail flame sprayed did not melt the metal at the nozzle. In addition to this difficulty, there are no difficulties such as seismic resistance, structural strength, heat insulation tiles, and communication for launching rockets on Earth.

Rockets on a small, atmosphereless planet like Europa are so easy to do.

In order to achieve high-performance heat-resistant materials, Chen Yue had to carry out scientific research.

The ratio of heat-resistant materials is recorded in the database, but unfortunately, Chen Yue's current industrial strength cannot be built at all. He can only find a way to develop materials that can be made by the current stage of industrial strength.

To this end, Chen Yue had to build a materials research institute, which specially allocated a large amount of computing power and began to develop robots and equipment in the past.

After three months of research and development, Chen Yue finally gave up. He had to admit that with his current level of technology, it was impossible to create the ideal kind of material.

So what to do?

After thinking for a moment, Chen Yue had to lower the thrust of the rocket in the design.

If the heat resistance of the material is not reached, then reduce the heat production rate. When the heat production rate is low, there is less heat, and combined with the existing heat dissipation device, the temperature should be able to be suppressed so that the material will not be burned and melted.

"Solved" this problem, the follow-up research and development will be much faster. In less than a month, the prototype was developed.

The first rocket made by Chen Yue was named the "Wooden Five" by him.

The Mu-5 rocket is not a rocket body like an Earth rocket, it is not even a cylinder.

It is shaped like a square table, about two meters long on the side, with four lower legs that act as a jet chamber, and the thicker table board is equipped with corresponding instruments and equipment, such as communication equipment, attitude adjustment equipment, fuel storage room, electronic control equipment, cooling system, etc.

It's empty, and when you need to launch a satellite, you can just tie the satellite to it with a rope.

This shape is completely aerodynamic. On Earth, it can't even fly. But there's no air on Europa—no, there's a little bit now, but it doesn't matter either.

At this moment, liquid hydrogen and liquid oxygen have been filled. After the last check, Chen Yue gave an order, and the "rocket" immediately ignited.

Oxygen-burning flames erupted from under its four legs, propelling it to rise.

It's not fast, not as violently accelerating as an Earth rocket – because it doesn't have a lot of thrust. It can only reach a maximum power of 3 meters/s^2, and it takes about 82 seconds to reach an orbit about 10 kilometers above the surface of Ganymede.

At that time, it will have a orbital speed of about 40 meters per second, and it will be able to orbit around Calmede in a stable orbit.

If it still has satellites on it, then just untie the rope and let the satellites circle around themselves.

It's as simple and crude as that.

Compared to the complex process and various high-precision equipment required to launch a satellite on Earth, it is so simple that it is weakly explosive.

Even Chen Yue was complaining in his heart.

But...... As long as it works. And it should work just fine.

At this moment, the "table" rocket flew slowly into the sky, and leisurely circled around Ganymede twice, and then flew back slowly and landed in the same place.