Vol 6 Chapter 2869: How big is the vast universe?
Hearing what Wu Hao said, several people couldn't help but nodded, but Zhang Xiaoman was still a little worried about not being able to cook on the moon.
Seeing this, Wu Hao smiled and said: "Actually, if you want to fry, you can still cook. It's just inconvenient. For example, the gravitational force on the moon is only one-sixth of that on the earth, which means that if you tilt the spoon, the pot will It takes a long time for the dishes in the dish to fall down, which is very inconvenient.
Secondly, cooking is prone to oily smoke and the taste is relatively strong. The space inside the scientific research station is limited, and the ventilation effect is relatively poor, and the air is circulated. So frying a dish may smell like oily fumes in the entire scientific research station.
Even if there is a special range hood, we still need to collect the fumes and then process them. The cost will be much higher. This is actually the same as why you can’t cook on a submarine.
Finally, open flames are prohibited in the scientific research station, so electric ceramic stoves or induction cookers can only be used for heating. If an open flame is used, it will greatly consume the oxygen in the scientific research station, which is not worth the loss, and it is also easy to cause a fire.
If the astronauts and researchers on the space station want to eat fried vegetables, they can 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. "
Prepared dishes? Lin Wei asked
No, Wu Hao shook his head with a smile: "It still needs to be cooked for a while."
"How big is your lunar research station?" Hearing Wu Hao's words, Zhang Xiaoman couldn't help asking curiously. Although she also reads the news, what's in the news is too unintuitive. It was a rare opportunity, so she still wanted to hear Wu Hao talk about it in person.
The entire Lunar Zhihai Lunar Surface Scientific Research Station is divided into three phases. We are currently preparing for the first phase of the project. The total construction area of the entire first phase of the project is about 500 square meters.
so big. Hearing Wu Hao's words, several people couldn't help being taken aback, and Zhang Xiaoman was also surprised.
Wu Hao nodded with a smile: "This is only the total building area, which also includes space occupied by some facilities. The real living space for people is only about 300 to 400 square meters, which is equivalent to about a large flat."
That is also very large. Wu Jianhua said.
It is relatively large, much larger than in the space above the outer space. However, for those who have been active for a long time, this area is still too small, and if you are confined in this space for a long time, there will still be some psychological problems.
At present, the astronauts and scientists on our national space station basically adopt a half-yearly rotation system for personnel rotation. The reason for adopting the half-yearly rotation method is mainly from the comprehensive consideration of many fields such as cost, personnel health, and material consumption.
We orbit around the low-Earth orbit two to three hundred kilometers above our heads, and the distance is about the same length as the journey back to our hometown.
The distance between the moon and the earth is 380,000 kilometers, and the distance from the space station to the ground is not worth mentioning between 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 to go around the Earth's equator nine and a half times!
so far!
Hearing Wu Hao's example description, Zhang Xiaoman, Wu Tong, and Lin Wei all showed expressions of experience. They had only heard that there was such a distance before, but without any reference, they naturally had no idea. And Wu Hao listed the reference objects, which surprised them belatedly.
If it is so far away, why do we still have to go to the moon? Doesn’t it mean that the moon is full of sand and people can’t live at all? Zhang Xiaoman raised his doubts.
Wu Hao smiled and replied: "Because the moon is the closest planet to our earth. Compared with 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 away, 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 that is relatively close to our earth and is our neighbor. Then How far is the distance between it and our earth, almost 200 million kilometers."
This is too reasonable. When Wu Tong sighed this time, she was also taken aback by the huge astronomical figure.
Hahaha, this is already relatively close in the astronomical unit. You must know that in astronomy, the longest thing we express is light years, that is, the time it takes for light to travel for one year.
So how fast is the speed of light, 300,000 kilometers per second, that is to say, the distance from the earth to the moon can be reached by light only a little longer than one second.
The closest star to our solar system, Proxima Centauri, is about 4.2 light-years away from our sun. And we currently know the universe, that is, how big is the universe that can be observed. It is probably a sphere with the earth as the center and a radius of 46 billion light-years.
this…
Hearing Wu Hao's description, everyone including Wu Jianhua opened their mouths, unable to calm down their surprise for a long time.
In 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 minuscule.
"So how many stars like the sun are there in this known universe? I don't know, because it's hard to estimate. But scientists have a rough estimate. The number is roughly 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. UU Reading www.uukanshu.com Everyone couldn't help sighing.
Wu Hao smiled and said: "Yes, it is because the universe is so big that we have to go out.
The father of modern spaceflight 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 becoming less and less enough for human use, so what should we do at this time, we can only go out.
In this vast universe, there are our inexhaustible resources. Not to mention other things, just the resources in the solar system are enough for us humans to use for tens of thousands of years.
And the solar system is equivalent to a drop in the ocean in the entire universe, a drop in the bucket. In the future, the resources on our earth and the solar system will be used up, so we can only go further afield to find them.
Although this time is still a long time away from us, we can't wait until all resources are used up before thinking about these things. We must plan ahead. "
(end of this chapter)
