Zhang Yuan pondered these astronomical data carefully, and he saw a circle of yellow and faint purple on the Gliese 581g. This circle of yellow and purple, widely distributed within the twilight line, seems to be very neat, not like it is naturally produced.

Because the spacecraft is still seven astronomical units away from the planet, the photo resolution is not high, and it is not known what it is.

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

The astronomer immediately replied, "...... For the time being, no intelligent life has been discovered, and the probe we launched is still on its way. But for now, no regular electromagnetic waves have been found in space. ”

"There are no artificial satellites and large buildings on the surface...... "The new 81 Chinese network is updated the fastest Computer:/

Zhang Yuan couldn't help asking, "Then what are these yellow ones?" Such a regular global spectacle can't be a natural formation, right? ”

Professor Fan said: "These anomalous colors are likely to be a large number of alien plants, but the color is slightly different from the plants on Earth. Most of the primeval forests of our earth are green, and the plants here are yellow and purple......"

"We suspect that these beings do not need oxygen, and that they obtain energy through reactions such as sulfur oxide, nitrogen oxide, etc., which is fundamentally different from our aerobic respiration."

Extraterrestrial life?

Zhang Yuan's heart jumped heavily, and many people sitting around him couldn't help but whisper to discuss.

In particular, some biologists have a sense of excitement compared to the sense of crisis, and for them, any bit of extraterrestrial life has a strong reference and guidance significance for questions such as the origin of life.

"These planets are already stellarly tidally locked. The side facing away from the star is too cold, the side facing the star is too hot, and the twilight line is neither hot nor cold, so it is a very good place to live. ”

"A large community of life at the twilight line, which can be exposed to eternal light and the temperature is suitable for ......"

"The strength of life is incredible."

"Ahem, let's be quiet for a while, and in a few days, the satellite will be able to transmit back first-hand information...... But I think ......"

The professor said a lot of things, and what he meant was that, according to the current information, there was a greater probability that there would be no intelligent life, and even if there was intelligent life, it was probably just some indigenous people, and there was nothing to be afraid of.

Anyway, as long as these lives don't have the ability to threaten humans, there's nothing to worry about.

When human beings reach a certain stage of development, they will definitely have to conduct more detailed field investigations of life on this planet.

Zhang Yuan and many people present breathed a sigh of relief, what they were most worried about was that there was already a strong interstellar civilization in this star field...... Even if this probability is very small, once this civilization exists, their boatman will undoubtedly become a turtle in the urn.

"There can't be a civilization that can develop into the space age without electromagnetic waves or satellites or anything like that, right?"

"yes."

Listening to everyone's discussion, Zhang Yuan stood up and said, "For the sake of prudence, we still have to 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 the various mechanical equipment carried on the spacecraft, everyone still selected the No. 1 satellite closest to Gliese 581g for development.

The 6 major planets are named B, C, D, E, F, G, etc., and this name is named in the order in which it was discovered by humans. However, the satellites attached to these planets are not named, and for the sake of simplicity, people directly call the largest satellite of the 581g planet No. 1.

The satellite is almost 4,000 kilometers in diameter, bare, the surface is full of craters, and the orbital period is about 14 days.

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

The reason for choosing Satellite 1 is that it is at a moderate distance from the star, and even if the star flares, the spacecraft will not be affected too much. And theoretically, according to the conditions for the formation of the planet, it has all the resources needed by humans, including all kinds of common metals, as well as rare elements, radioactive elements, and so on.

The only drawback is that it is relatively close to the living planet, and there may be some potential threats. Life has endless possibilities, and who knows what strange life will be in it.

However, the distance between the satellite and the planet is 360,000 kilometers, and if something really happens, there is time to react. Zhang Yuan didn't believe that any creature could break free from the gravitational pull of the planet and jump onto the Earth Age with its own body.

Therefore, being close to the living planet is not necessarily a disadvantage, but it may also be an advantage, at least it will be much easier to conduct scientific research and investigation in the future.

Compared to other planets, which may have shortcomings that are difficult to remedy, No. 1 is already quite a good planet.

"But, Lao Zhang, at this rotation speed, if a space elevator is placed 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 altitude of the synchronous orbit is more than 80,000 kilometers, and we don't carry so many raw materials at all...... What to do? ”

"No, you've miscalculated......"

Zhang Yuan smiled and pointed out: "In this case, the laying of the space elevator also has to consider the huge gravitational pull of another planet. So, our spacecraft will not stay directly in synchronous orbit......"

"You calculate again, the gravitational pull of the moon, cancel out the gravitational pull of the planet, and then use the rest to calculate......" ァ新ヤ~(8)~1~Chinese網ωωω.χ~8.~1zщ.còм

"Makes sense!"

Ye Kaifu suddenly realized, "I haven't touched this thing for several years, and I have forgotten it a little, but fortunately I didn't ask directly, otherwise it would be embarrassing." ”

He calculated carefully, and it only took 8,000 kilometers to get the orbital altitude, and he couldn't help but secretly rejoice.

This distance is good, and the construction difficulty of the space elevator is greatly reduced, so there is nothing to worry about.

As for the issue of energy......

"There should be enough uranium deposits on the planet to support the first few steps of human development."

Moreover, when there is sufficient sunlight, solar panels can be considered on the sunny side of the planet to replace nuclear energy. Solar panels are a very cheap and simple technology, and 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 proudly clapped his hands and said, "...... So it was decided, to open our first landing site on satellite 1! ”

……