Is seeing a meteor a good thing or a bad thing?

It's good to see a meteor. People usually give it a beautiful meaning, thinking that seeing and wishing on a meteor can realize your wish. Meteor is a meteoroid running in interstellar space (usually including cosmic dust particles, solid blocks and other space substances), which is attracted by the earth because of its gravitational perturbation when it approaches the earth.

So as to enter the earth's atmosphere and rub with the atmosphere to burn the light trace. Meteorites used to revolve around the sun, and when they passed near the earth, they changed their orbits under the action of the earth's gravity, thus entering the earth's atmosphere. There are several kinds of meteors: single meteor, fireball and meteor shower.

Most of them have been burned to ashes before falling to the ground, and a few will become meteorites and fall to the ground. Most visible meteoroids are similar to sand grains and weigh less than 1 g. The velocity of meteors entering the atmosphere is between 1 1km/s and 72 km/s.

The Source of Meteors In fact, every meteor shower is not as beautiful as it seems. In fact, meteors are dust released by meteorites far away from the earth, and there will be relatively large stones inside. When it reaches the earth, it will be attracted by the gravity of the earth, thus rubbing against the atmosphere and producing a meteor shower.

The effect is like throwing a piece of dry and wet soil at an object and controlling the speed. The first thing that approaches the object is the dust on the soil, followed by the soil itself.

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The discovery and record of meteor shower was also the earliest in China. There is a record in the Annals of Bamboo Books that "in the fifteenth year of Xia Emperor, the stars fell like rain at night". The most detailed record can be found in Zuo Zhuan: "In the summer and April of the seventh year of Duke Zhuang of Lu, the stars disappeared, and the stars rained down at night." The seventh year of Duke Zhuang of Lu was 687 BC, which was the earliest record of Lyra meteor shower in the world.

There were about 180 meteor showers in ancient China. Among them, Lyra meteor shower recorded about 9 times, Perseid meteor shower recorded about 12 times, and Leo meteor shower recorded 7 times. These records will also be important information for studying the orbital evolution of meteor groups. The appearance of meteor shower is quite touching. China's ancient records are also wonderful.

Take the record of Lyra meteor shower as an example: In the Northern and Southern Dynasties, Emperor Liu Song filial piety "May and March of the Ming Dynasty, the moon covered Xuanyuan. There are tens of millions of meteors, long or short, big or small, facing west until dawn. " (Song Shu Tian Wen Zhi) This was in 46 1 year. Of course, the so-called "tens of millions" here is not an exact number, but a general term for "extremely many".

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