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Spectacular meteor shower

Spectacular meteor shower (Picture 1)


The occurrence of meteor showers is generally thought to be the result of friction between meteoroids and the Earth's atmosphere. Meteor groups are often produced by fragments of comet splitting. Therefore, the orbits of meteor groups are often associated with the orbit of comets. Groups of meteors form a meteor shower. The meteor shower looks like a meteor bursting from the night sky and falling down. This or this small block of sky is called the radiant point of the meteor shower. Meteor showers are fundamentally different from sporadic meteors. Sometimes there are only a few meteors in an hour, but they all seem to "flow out" from the same radiant point, so they are also in the category of meteor showers; when there are more than 1000 meteors per hour, we call them For "Meteor Storm." The meteor shower is usually named after the constellation of the sky zone where the meteor shower is located to distinguish meteor showers from different directions.

For example, the Leonid meteor shower appears around November 14-21 every year. In general, the number of meteors is about 10 to 15 per hour, but on average, every 33 to 34 years, the Leonid meteor shower will have a peak period, and the number of meteors can exceed thousands per hour. This phenomenon is related to the cycle of Tamp-Tat and Comet. When a meteor shower occurs, the meteor appears to be emitted by a specific point in the sky. This point is called the "radiation point" and is named after the Leonid meteor shower's radiant point is in Leo. The Orion Meteor Shower, the Aquarius Meteor Shower, and the Perseid Meteor Shower are also named after this. A single meteor is random in both direction and time, and there is no point of radiation. This meteor is called an accidental meteor. One of the important features of meteor showers that are essentially different from sporadic meteors is that the inverse extension lines of all meteors intersect at the radiant point.

It is best not to use telescopes when observing meteor showers, only our eyes and the clear, dark sky. Secondly, the observation of meteor showers is not as rainy as it is supposed to be. If you observe some meteor showers with relatively small flows, or if the conditions for observing meteor showers are poor (the sky is not dark enough), it is common to see a meteor in a few hours. thing. No matter how big the meteor shower, in general, only a few can be seen in an average of 1 minute, and some may reach dozens, such as the Leonid meteor shower in 2001, and as much as the rainy meteor shower is rare, historically There have been times, such as the Leonid meteor shower in November 1833, which was the most spectacular meteor shower in history, with as many as 35,000 meteors per hour.

Some meteoroids are large in size, and in the atmosphere, less than all of them are burned to ashes, and when they fall to the ground, they are comets. Comet is divided into vermiculite (stone-based) and ferroniobium (iron-based) due to different content of components. There are many craters on Earth, which are the product of meteorite impact. However, due to the weathering of the Earth region, the vast majority have long been destroyed and unrecognizable, and more than 150 have been confirmed. The most famous of these is a large crater located in the deserts of northern Arizona. It has a diameter of 1,245 meters and a depth of 172 meters. In the pit, people have collected several tons of stellite fragments. According to projections, this is a pothole caused by the fall of an iron comet weighing more than 100,000 tons about 20,000 years ago.

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