Chapter 206

Zhang Yuan pondered over these astronomical data carefully. He saw a circle of yellow and faintly purple things on Gliese 581g. This circle of yellow and purple, widely distributed in the twilight line, seems very neat, not natural.

Because the spacecraft is still seven astronomical units away from the planet, the photo resolution is not high, and I don't know what it is.

"Professor Fan, have you found traces of intelligent life?" Captain Zhao also saw the picture, pondered for a while and asked.

The astronomer immediately replied: "... No intelligent life has been found yet. The probe we launched is still on the journey. But at present, no regular electromagnetic waves have been found in space. "

"No man-made satellites and large buildings on the earth's surface have been observed..."

Zhang Yuan asked, "what are these yellow ones? Such a regular global wonder can't be formed naturally? "

Professor Fan said: "these abnormal colors are likely to be a large number of alien plants, but the colors are slightly different from those on earth. Our earth's vast virgin forests are green, and the plants here are yellow and purple... "

"We suspect that these lives do not need oxygen. They obtain energy through reactions such as sulfur oxide and nitrogen oxide. This way of breathing is essentially different from our aerobic breathing."

Alien life?

Zhang Yuan's heart jumped heavily, and many people sitting around couldn't help whispering.

In particular, some biologists are more excited than the sense of crisis. For them, any extraterrestrial life has a strong reference and guiding significance for issues such as the origin of life.

"These planets have been locked by tides. The side facing away from the star is too cold, and the side facing the star is too hot. The twilight line is neither cold nor hot. It is a very good place to live. "

"The large life community located at the dusk line can be exposed to eternal light and the temperature is appropriate..."

"The strength of life is incredible."

"Cough, please be quiet first. In a few days, the satellite will be able to transmit back the first-hand data... But I think..."

The professor said a lot. He meant that according to the current data, the probability of no intelligent life is higher. Even if there is intelligent life, it is likely to be only some aborigines, which is not enough to be afraid.

Anyway, as long as these lives do not have the ability to threaten human beings, there is nothing to worry about.

When mankind has reached a certain stage of development, we must conduct more detailed field visits to the life of this planet.

Zhang Yuan and many people here followed with a slight sigh of relief. Their biggest worry is that there is a strong interstellar civilization in this star region... Even if this probability is very small, once this civilization exists, their ship will undoubtedly become a turtle in a jar.

"It's impossible for civilization to develop into the space age without electromagnetic waves or satellites?"

"Yes."

Listening to the discussion, Zhang Yuan stood up and said, "for the sake of caution, we should shield the radio waves of the spacecraft itself as much as possible until more specific information appears."

The proposal was quickly adopted unanimously.

Next, after a series of discussions, combined with various mechanical equipment carried on the spacecraft, we still selected the No. 1 satellite closest to Gliese 581g for development.

The six major planets are called B, C, D, e, F and G, which are named in the order of human discovery. But the satellites attached to these planets are not named. For simplicity, people directly call the largest satellite of planet 581g as No. 1.

The moon is nearly 4000 kilometers in diameter. It is bare. Its surface is full of craters. Its revolution cycle is about 14 days.

Coupled with the tidal locking, its rotation period is equal to the revolution period.

The reason for choosing satellite 1 is that its distance from the star is moderate. Even if the star bursts a flare, the spacecraft will not be greatly affected. And theoretically, according to the formation conditions of the planet, it has all the resources needed by human beings, including all kinds of common metals, rare elements, radioactive elements and so on.

The only disadvantage is that it is relatively close to the life planet, and there may be some potential threats. Life always has infinite possibilities. Who knows what strange life will be in it.

However, the distance between the satellite and the planet is 360000 kilometers. If something really happens, there is time to respond. Zhang Yuan doesn't believe that there are creatures who can break away from the gravity of the planet and jump onto the earth times with their own bodies.

Therefore, being close to the life planet is not necessarily a disadvantage. On the contrary, it may also be an advantage. At least it will be much more convenient for scientific investigation in the future.

Compared with other planets, there may be irreparable defects. No. 1 is already a very good planet.

"However, Lao Zhang, at this rotation speed, if a space elevator is installed on this planet, the height of the synchronous orbit will be very exaggerated!"

Ye Kaifu whispered under his seat, "the rotation speed of this planet is too slow. I calculated casually. The height of the synchronous orbit is more than 80000 kilometers. We don't carry so many raw materials at all... What should we do?"

"No, you miscalculated..."

Zhang Yuan smiled and pointed to the right way: "in this case, the laying of the space elevator has to consider the huge gravity of another planet. Therefore, our spacecraft will not directly stay in synchronous orbit... "

"You can calculate the gravity of the satellite, offset the gravity of the planet, and then use the rest to calculate..."

"That makes sense!"

Ye Kaifu suddenly realized, "I haven't touched this thing for several years. I've forgotten it. Fortunately, I didn't ask questions directly, otherwise I'll lose my hair."

After careful calculation, he only needed 8000 kilometers to get the orbital height, and he couldn't help but rejoice secretly.

This distance is good. The construction difficulty of space elevator is greatly reduced. Don't worry about anything.

As for energy

"The planet should be able to find enough uranium to support the first few steps of human development."

Moreover, when the light is sufficient, we can consider laying solar panels on the sunny side of the planet to replace nuclear energy. Solar panel is a very cheap and simple technology. Zhang Yuan thinks that with the equipment carried by the current spacecraft, it can be mass produced in a year or two.

After some discussion, Captain Zhao clapped his hands with great pride and said: "... So it's decided to open our first landing point on satellite 1!"

……