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Comet: Night Sky "Alternative" Ranger – Technology & # 39; Daily – Hanfeng.com



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2018-12-06 01:30:51 Source: Science and Technology & # 39; Daily


The Comet Halley once visited the world in 1986. NASA Since December, the Comet 46P gradually became better and brighter. Photo by Wang Zhuoyu

spectral

F & # 39; December, the star of photography enthusiasts are working again. In addition to Gemini meteor shower, are also keen to star "alternative" – ​​the comet 46P.

Looking at the night sky, the stars and the moon, each follow their own trajectory and appears regularly in the vision of people. But comets are a special group. Free between the sun and many planets, in & # 39; close contact with Earth for decades & # 39; years or centuries. Every time they show, they all emit light shiny, and even more, dragging their long tails and swaying through the night sky.

The comet is ċelestiku body in the solar system and enters the brightness and shape changed by the change of distance & # 39; day. The comet is divided into three parts: the nucleus, the iskorpru and tail. The quality and density of comets are very small: when & # 39; away from the sun, only "dirty dirty ball" made of frozen cubes of ice like water, ammonia and methane. When approaching the sun, the comets divided into & # 39; għadaq and sin under the action of solar radiation, such as a broom.

In order to better identify the comet, all confirmed KOMEF has its own name. Comet is named after the last name or number finder. When called by name, comet can & # 39; is mentioned only three discoveries, like a comet "Sumek-Levy 9" in 1994.

If the number called, before 1995, the comets were named in the order of discovery every year. Since 1995, the International Astronomical Union adopted a new method of & # 39; numbering f & # 39; in alphabetical order & # 39; half months. The specific method is to remove the letters I and Z, and ssortja 24 remaining letters, corresponding to 12 months of the year, and then use the numeric numbers & # 39; 1 sequence, 2 , 3, etc. to name the comet found in & # 39; half a month. At the same time, to identify the comet status, the corresponding letters are marked later: P for & # 39; short period comet; Comet C for a long period; D for a comet to m & # 39; m still back or still & # 39; still, and for a comet that you & # 39; is an asteroid; X indicates that it is impossible to calculate the comet & # 39; orbit.

In ancient times, because comets were too attractive and formed in the sky the night, the old associate some of the great things that have happened, especially bad things, by the appearance & # 39; comets . The History of History says "seven & # 39; years, the comet is out, see the North, see the West in & # 39; May", which corresponds to the fact that after the Qin Dynasty was succeeded to the throne at the end of the period of the Holy States, genres military meritarji monks died. But the power of & # 39; this comet is not limited to this. After some time, the comet reappeared, and a half months, was hung in the sky, and grandmother Jixia Xia, who was in charge of the government, has died again. There are more records & # 39; stories like this. Each comet in history is accompanied by various disasters. Because dragged its long tail, like a broom, the ancients believed that the nebula was not known, it brings bad luck. But with the advancement of science, humans realize that the comet is just a special celestial body around the Japanese movement, has cycle & # 39; his own return, and m & # 39; is x & # 39; share anything humans with special events.


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