Lantern Festival, come to a bowl of cold knowledge about the moon
Xinhua News Agency, Nanjing, February 26th (Reporter Wang Jueping) The Lantern Festival is ushered in on the 26th.
Everyone enjoys reunion, eats Lantern Festival, and don’t forget to appreciate the first full moon of the Xin Chou Year of the Ox.
The popular science experts of the Purple Mountain Observatory of the Chinese Academy of Sciences have compiled a collection of "cold knowledge" on the moon, allowing you to enjoy the "super-large bowl" of the moon encyclopedia while tasting the Lantern Festival.
Why is the moon sometimes yellow and sometimes white?
Hu Fanghao, director of the Science Popularization Department of the Purple Mountain Observatory of the Chinese Academy of Sciences, said that the moon itself does not emit light.
When this light enters the earth's atmosphere, it will scatter.
When the moon rises or there is more dust and water vapor in the air, light with shorter wavelengths is blocked and absorbed more, and the remaining light enters the human eye and looks yellow.
When the moon is high and the air is clean and there are few clouds, most of the light can penetrate the atmosphere. At this time, the moon appears bright and white.
What's on the moon?
As humans continue to explore the moon, the illusion of Toad Palace and Chang'e on the moon no longer exists, but the mysterious and rich lunar landforms also deeply attract us.
On the moon, there are more than 33,000 craters with a diameter of more than 1 km, which are mainly formed by asteroid impacts.
The dark area on the front of the moon is called the Moon Sea. They are low-lying plains on the moon. They were filled with basalt during the early volcanic eruption on the moon and appeared darker and darker.
The highlands 2 to 3 kilometers above the moon sea are moon land and mountains.
In addition, there are moon valleys, moon creeks, and moon radiation patterns. Is there a different kind of romance?
What is the relationship between the moon and the earth?
The moon revolves around the earth and is a natural satellite of the earth.
Usually, we can intuitively feel the gravitational force between the earth and the moon through tidal phenomena.
Interestingly, tides also slow down the rotation of the earth.
On average every century, the time for the earth to rotate one revolution increases by about 0.0018 seconds.
According to rough calculations, 400 million years ago, the earth's rotation took only 22 hours.
Why "the moon is cloudy and clear"?
The moon is a spherical celestial body, and only half of it can be illuminated by the sun at the same time.
The moon moves in space, so that the illuminated half is constantly changing: the side facing the earth is completely illuminated, and we see the full moon.
The side facing away from the earth is completely illuminated, and we cannot see the moon, which is called the new moon.
Between the full moon and the new moon, we can only see a part of the area that is illuminated, so there is a roundness of change.
I know you have endured it for a long time, and I want to ask: Can I grow vegetables on the moon? Unfortunately, this is not possible under natural conditions. The soil layer of the moon is called floating soil, which is composed of dust and rock debris. There is no water in the soil. The moon’s atmosphere is also very thin, close to a vacuum, which does not meet the growth conditions of the earth’s plants. Before the moon greenhouse goes online, if you want to "dry food" on the moon, you should bring your own dry food.