On June 26, 2022, a strange scene appeared in the sky over Chang'an District, Shijiazhuang, Hebei: A huge square shadow appeared in the sky. The overall color of this square shadow was black, but it was mixed with red, and its There is a layer of yellow-white light surrounding it.
Witnesses have made a lot of guesses about what this square shadow is. Many people say that it may be UFO (UFO), but this square shadow does not move or fly, it just keeps hanging there, so it should be unlikely. It's a UFO.
So what exactly is this square shadow?
Actually, this square shadow is just a normal light and shadow effect of . This square shadow may be cast by a nearby building on the clouds. The reason why has red light is probably because of the building. The light above contains red.
In order to present similar light and shadow effects in the sky, two conditions generally need to be met: the first is that the weather should be mainly cloudy and rainy, there must be thick clouds in the sky, so that the light on the ground can be reflected , and The cloud layer should not be too high, and should be lower than 600 meters;
The second condition is that the lights on the buildings above the ground should be relatively strong, and the spotlights should be basically turned on, otherwise it will not be reflected that far.
As long as these two conditions are met, there is a high possibility of a similar scene appearing in the sky.
On April 19, 2019, an unknown light group also appeared in the night sky in Shijiazhuang, and these light groups kept changing colors, sometimes blue, sometimes purple, sometimes green, sometimes red... It was very gorgeous, and the citizens exclaimed that it was magical. The weather in Shijiazhuang that night was also cloudy . The clouds were very thick, like a curtain. The colorful lights on the ground viaduct hit the clouds to form this colorful light and shadow. Effect.
On the evening of June 21, 2021, a huge triangular object appeared in the clouds in the night sky over the North Bund in Shanghai. It was very shocking with sharp edges and corners. As soon as the
video and photos were leaked, many people speculated that it was a UFO. Some people also claimed that it was the TR-3B, the most advanced anti-gravity reconnaissance aircraft in the United States. They even gave a series of evidence that seemed reasonable. But in fact, the unknown triangle was also projected by the light from the building. That night, the sky in Shanghai was covered with dark clouds. Opposite the North Bund riverside viewing platform was the Bayfront Tower, and there were many landscape spotlights around it. In the sky near the building.
On the night of March 11, 2022, a mysterious halo appeared in the sky over Beijing. Everyone’s imagination was wide open. Some people called it the “Gateway to Time and Space”, while others called it “the trace of aliens who have just arrived.” ...In fact, this halo like a "giant smoke ring" is just because the light from the Bird's Nest is projected onto the clouds.
So why has it not appeared before, but it appeared on this night? It is also because Beijing was in a cloudy state that day, the sky was covered with dark clouds, and the clouds were very thick, and the spotlights on the Bird's Nest were very strong. , when such light is projected into the clouds, the clouds will produce a high reflectivity , so this mysterious halo appears in the sky.
There are actually many similar light projections that have occurred all over the world, so I won’t list them all here. Many times people will speculate whether these phenomena are related to alien planets and UFOs, but in fact , At this stage, there is no evidence to prove that there are unknown alien civilizations in the universe. These seemingly mysterious phenomena are actually normal natural phenomena and have scientific basis.
So let’s take a look at some other magical natural phenomena.
Heliotrope is a optical phenomenon in nature. Three or more suns will appear in the sky. Everyone knows that there is only one sun in the sky, so the remaining suns are not real, so they are called It is the "phantom sun".
The reason why human eyes can see multiple suns is due to the refraction of light. The real sunlight in the middle of is refracted through the hexagonal prism. In , two or more suns will appear on both sides of the real sun. , but in fact they are just virtual images of the real sun.
So where do these hexagonal prisms come from? In fact, they are hexagonal columnar ice crystals, they float in thin translucent clouds high in the sky, and are neatly arranged vertically. When the sunlight shines on them, they will be refracted.
Generally, when three suns are seen with the naked eye, it is called "22-degree sundog" , because the degree of refraction of the sun's rays in the horizontal direction to the left and right is about 22 degrees at this time. At this time, the sun comes out of the icicles. The three rays of light will be refracted into the human eye, and the human eye can see three suns. When five suns are seen on the same horizontal line
with the naked eye, the sun dog at this time is called "44-degree sun dog" . This phenomenon is rarer than the "22-degree sun dog".
The sun dog phenomenon usually occurs in the morning or evening. It does not last long, usually a few minutes, but it has lasted for more than ten minutes. Moreover, the occurrence of sundog requires very harsh climatic conditions, so that people can enjoy this spectacle.
The first thing is to have altostratus clouds , because there must be clouds to form ice crystals;
The second thing is The cloud layer should not be too thick, but should be thin, so that there is good light transmittance ;
again temperature It should be lower, otherwise there would be no ice crystals in the clouds, usually in ice and snow days, when the temperature is more than ten degrees or even dozens of degrees below zero. Another important point about
is that from the perspective of the observer of , cannot be seen even if the angle is off.
Combined with the above conditions, especially the temperature conditions, the sun dog phenomenon generally occurs in winter in high latitude areas, such as Harbin, Jilin, Changchun, Urumqi, Hohhot, Mohe and other places in my country, as well as Sweden Stockholm , Russia's and Siberia have all appeared, but cities with lower latitudes may also appear when they encounter colder days, such as Shanghai, Chongqing, and Jiaxing, or the sun dog phenomenon also occurs.
The cold night light column phenomenon is a very rare and beautiful natural phenomenon. To the naked eye, it looks like multiple vertical lights shining from the ground to the sky. In fact, this is just like the sun, it is also a phenomenon in the human eye. virtual image .
The hexagonal flat ice crystals in the atmosphere are like mirrors floating in the air. The light is reflected into the air by these ice crystals, forming virtual images of vertical light beams.
Since the cold night light pillar phenomenon is also related to ice crystals, the conditions for its occurrence also require low temperatures, usually around minus 20 degrees, and it must be at night with clean air and bright lights.
In my country's Xinjiang Altay region, there have been several beautiful light pillar phenomena at cold nights. The intensity is extremely strong, close to the world's top level. The colorful light pillars penetrate into the starry sky, like a dream, comparable to the aurora. .
In addition to Altay, Shenyang, Harbin, Xilinhot, and other places have experienced the phenomenon of light pillars at cold nights. This beautiful landscape has also appeared in Norway and Canada.
In addition to sundogs and cold night light pillars, there are mirages, morning glory clouds, volcanic lightning and other very magical and spectacular natural phenomena.
We have seen that nature is really full of wonders. It is simply a magical creator. When we see many strange phenomena, we should not immediately connect them with alien planets and unknown objects. Maybe they are nature's A work of extraordinary craftsmanship.
Author: Qiao Mu Proofreading Editor: Xiaowan
