On October 25, in Shijiazhuang, Hebei, a student accidentally photographed a huge "fireball" passing through the sky, and emitted a shining green light, suspected to be a meteor passing by. Many netizens said: Aliens are here.
According to the video content, the luminous huge "fireball" flies very fast, and it is dragging a long tail at the back end, with an orange-red tail and a huge fireball green. What exactly is this?
giant "fireball" is a meteor?
According to the video content analysis, the giant green "fireball" emits light instantly, which is actually a kind of meteor. So, why is the color of a meteor green?
The meteors we are familiar with are usually more white and yellow. In fact, the color of the meteor is different depending on the meteor body . For example, the colors of meteors are: blue, red, green, purple, etc.
Why do shooting stars appear in various colors? It is mainly related to the chemical composition of the meteorite, the temperature, speed of the reaction and the vaporization height. For example, the body of a meteor contains sodium atoms that emit orange-yellow light, iron is yellow, magnesium is blue-green, calcium is purple, and silicon is red. Therefore, the colors appear in different meteor bodies.
In our space, where does the meteoroid with different chemical elements come from? In the solar system we are familiar with, in addition to the star sun, the eight major planets of , and related natural satellites, asteroids, comets, , there are also a large number of dust particles and tiny solid blocks.
These tiny solid blocks may come from comets, remnants of collisions from asteroids or other forms of space debris. When approaching the earth, they are affected by the gravity of the earth, causing the orbit to change, enter the atmosphere, and generate a large amount of light and heat when rubbing with the air.
Due to tiny solid blocks, other celestial bodies in the universe, their compositions are different, so the colors entering the atmosphere are also different.
It is reported that the popular tiny particles correspond to the earth at a high speed, about 11~72 km/sec. The gases in front are compressed to produce high temperatures and electronic transitions occur. They appear as a light trace in the night sky, and usually have an altitude of 80~120 km. The lowest Fire Meteor will disappear only about 10 to 20 kilometers from the ground.
Most Meteorites are destroyed by frictional heat when they penetrate the Earth's atmosphere. Arriving at a small portion of the Earth's surface has attracted great interest because they allow us to chemically analyze their composition and refine the information we gather from their spectrum .
Will the shooting star turn green?
It is understood that when Perseid meteor shower comes, it is often accompanied by bright moonlight, but many people say "the moon is not made of green cheese."
Some astronomical enthusiasts say that the reason why the meteor emits green light is the atmosphere. When the meteor body passes through the atmosphere, the air on its path will become very hot.
According to scientists' analysis, at high temperatures of hundreds of degrees Celsius, oxygen molecules will briefly lose an electron, but they recombined very quickly (e - + O 2 +), and their process emits green photons, which is a bit similar to green aurora.
Scientists conducted detailed observations of the green light of the meteor and found that the green line is not simply green. There may be a red and yellow line next to the green line. In fact, the yellow line is caused by the burning of the meteor.
Scientists explain: When a celestial body rich in sodium passes through the atmosphere, the hot sodium vapor will emit yellow light like a sodium-containing radiation lamp. However, depending on the angle of each person, the observed colors may also vary.
In people's observations of fire meteors, the color of the meteor is usually reported because the brightness of fire meteors is large enough to give human color perception a chance.The color range in the report can cover the entire visible light spectrum, from red to blue, and very little purple.
Summary
Meteors are a very common natural phenomenon. In the orbit of our earth, there are a large number of particles or small meteorites. After entering the atmosphere, due to the very high speed, it is very easy to rub high altitudes with the atmosphere, emit dazzling light, and may even explode in serious cases.
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