Chapter 206 (2/2)
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!”
……