Military Technology

Hearing what Wu Hao said, several people couldn't help but nodded, but Zhang Xiaoman was still a little bit worried about not being able to cook on the moon.

Seeing this, Wu Hao smiled and said: "Actually, if you want to stir-fry, you can still stir-fry. It's just inconvenient. For example, the gravity on the moon is only one-sixth of that on the earth, which means that if you turn the spoon, the pot will It took a long time for the vegetables to fall down, which was very inconvenient.

Secondly, cooking is easy to produce fumes and the smell is strong. The space inside the scientific research station is limited, and the ventilation effect is relatively poor, so the air is circulated. Therefore, when you cook a dish, the smell and fumes may spread throughout the scientific research station.

Even if there is a special range hood, we still need to collect the fume and then process it, and the cost will be much higher. This is actually the same as why cooking cannot be done on a submarine.

Finally, open flames are prohibited in the scientific research station, so you can only use electric ceramic stoves or induction cookers for heating. If an open flame is used, it will greatly consume the oxygen in the scientific research station, which is not worth the gain, and it can also easily cause a fire.

If the astronauts and scientific researchers on the space station want to eat stir-fried vegetables, they can definitely supply them from the earth. It is fried on the earth and then vacuum-sealed and refrigerated, and then transported to the moon for processing. "

Pre-made dishes? Lin Wei asked

No, Wu Hao smiled and shook his head: "It still needs to be cooked for a while."

"How big is your lunar research station?" Zhang Xiaoman couldn't help but wonder after hearing Wu Hao's words. Although she also watches the news, the news is too unintuitive. It was a rare opportunity, so she wanted to hear Wu Hao speak in person.

The entire Lunar Zhihai Lunar Surface Scientific Research Station is divided into three phases. We are currently preparing to build this first phase project. The total construction area of ​​the entire first phase project is about more than 500 square meters.

So big. Hearing Wu Hao's words, several people couldn't help but be stunned, and Zhang Xiaoman was also surprised.

Wu Hao smiled and nodded: "This is only the total building area, which also includes the space occupied by some facilities. The real space for people to live in is only about three to four hundred square meters, which is equivalent to about a large flat floor."

That's pretty big too. Wu Jianhua said.

It is relatively large, much larger than in space. However, for people who are active for a long time, this area is still too small. If you are bound to this space for a long time, some psychological problems will still occur.

At present, the astronauts and scientists on our National Space Station basically adopt a semi-annual rotation system to rotate personnel up and down. The reason for adopting the semi-annual rotation method is mainly based on comprehensive considerations in many areas such as cost, personnel health, and material consumption.

We are orbiting in a low-Earth orbit of about two to three hundred kilometers above us, and the distance is about the same as the journey back to our hometown.

The distance between the moon and the earth is 380,000 kilometers. The distance between the space station and the ground is not worth mentioning compared to the distance between the earth and the moon.

What is the concept of 380,000 kilometers? The circumference of the earth's equator is about 40,000 kilometers. If converted, the distance between the earth and the moon is almost nine times the circumference of the earth's equator. That is to say We're going nine and a half times around the Earth's equator!

so far!

After hearing Wu Hao's description with examples, Zhang Xiaoman, Wu Tong, and Lin Wei all showed expressions of experience. They had only heard that there was such a distance before, but they had no reference, so they had no idea. Wu Hao listed out the reference objects, which made them surprised.

If it's so far away, why do we still have to go to the moon? Isn't it said that the moon is full of sand and people can't live at all? Zhang Xiaoman expressed his doubts.

Wu Hao smiled and replied: "Because the moon is the closest planet to our earth. Compared to the boundless universe, the distance from the earth to the moon is simply no distance.

For example, if the universe is compared to the earth, then the distance from the earth to the moon may be only one foot, or even shorter. "

Looking at the surprised expressions of several people, Wu Hao smiled and continued to popularize science: "In addition to the moon, Mars is also an important planet for our exploration, because Mars is a planet relatively close to our earth and a neighbor of our earth. So. How far is it from our earth? It's almost 200 million kilometers."

This is too rational. Wu Tong was the one who sighed this time. She was also shocked by the huge astronomical figure.

Hahaha, this is relatively close within the astronomical unit. You must know that the longest expression in astronomy is light year, which is the time it takes for light to travel for one year.

So how fast is the speed of light? It is 300,000 kilometers per second, which means that the distance from the earth to the moon, light only needs a little more than one second to reach.

The nearest star to our solar system, Proxima Centauri, is about 4.2 light-years away from our sun. As for our current known universe, that is, how big the observable universe is, it is probably a sphere with the Earth as the center and a radius of 46 billion light-years.

this……

After hearing Wu Hao's description, everyone including Wu Jianhua opened their mouths and could not calm down the surprise in their hearts for a long time.

After such a conversion, a human being in the universe may be equivalent to a bacterium in the natural world. No, it may be an atom smaller than a bacterium, which is insignificant.

"So how many stars like the sun are there in the known universe? I don't know because it is difficult to estimate. But scientists have a rough estimate. The number is probably equivalent to all the sand on the earth.

In other words, our sun is just like a grain of sand on the earth in the universe, insignificant. "

This is too huge. Everyone couldn't help but sigh.

Wu Hao smiled and said: "Yes, it is precisely because the universe is so big that we have to go out.

The father of modern aerospace and Soviet scientist Konstantin Tsiolkovsky once said that the earth is the cradle of mankind, but mankind cannot live in the cradle forever.

With the continuous development of our human society, the resources on the earth are increasingly insufficient for human use. So what should we do at this time? We can only go out.

In this huge universe, there are inexhaustible resources for us. Not to mention anything else, the resources in the solar system alone are enough for us humans to use for tens of thousands of years.

The solar system is equivalent to a drop in the ocean in the entire universe. In the future, when the resources on our earth and the solar system are used up, we will have to look further afield.

Although this time is still far away from us, we cannot wait until all resources are used up before thinking about this. We must prepare for a rainy day. "