选文第三段在说明银河系时，为什么要提到牛郎织女

精选知识

在文段中穿插这一故事：是因为可以使说明文 更富有生动性,让人生动形象的联想到“银河系是一个环,套在地球周围”.

自我认为是这样,错了应该不怪我吧?!

帮忙采纳吧!

其他类似问题

问题1：对银河系的简单介绍,一段话就行,简略些.[物理科目]

银河系是地球和太阳所属的星系.因其主体部分投影在天球上的亮带被我国称为银河而得名.银河系约有2000多亿个恒星.银河系侧看像一个中心略鼓的大圆盘,整个圆盘的直径约为10万光年,太阳位于距银河中心2.3万光年处.鼓起处为银心是恒心密集区,故望去白茫茫的一片.银河系俯视像一个巨大的漩涡,这个漩涡有四个旋臂组成.太阳系位于其中一个旋臂（猎户座臂）,逆时针旋转（太阳绕银心旋转一周需要2.5亿年）.

问题2：银河系的英文介绍内容要全英的[英语科目]

The Milky Way is the galaxy which is the home of our Solar System together with at least 200 billion other stars (more recent estimates have given numbers around 400 billion) and their planets,and thousands of clusters and nebulae,including at least almost all objects of Messier's catalog which are not galaxies on their own (one might consider two globular clusters as possible exceptions,as probably they are just being,or have recently been,incorporated or imported into our Galaxy from dwarf galaxies which are currently in close encounters with the Milky Way:M54 from SagDEG,and possibly M79 from the Canis Major Dwarf).See our Messier Objects in the Milky Way page,where details are given for each object to which part of our Galaxy it is related.All the objects in the Milky Way Galaxy orbit their common center of mass,called the Galactic Center (see below).

As a galaxy,the Milky Way is actually a giant,as its mass is probably between 750 billion and one trillion solar masses,and its diameter is about 100,000 light years.Radio astronomial investigations of the distribution of hydrogen clouds have revealed that the Milky Way is a spiral galaxy of Hubble type Sb or Sc.Therefore,our galaxy has both a pronounced disk component exhibiting a spiral structure,and a prominent nuclear reagion which is part of a notable bulge/halo component.Decade-long observations have brought up more and more evidence that the Milky Way may also have a bar structure (so that it would be type SB),so that it may look like M61 or M83,and is perhaps best classified as SABbc.Recent investigations have brought up support for the assumption that the Milky Way may even have a pronounced central bar like barred spiral galaxies M58,M91,M95,or M109,and thus be of Hubble type SBb or SBc.

More on the structure of the Milky Way

The Milky Way Galaxy belongs to the Local Group,a smaller group of 3 large and over 30 small galaxies,and is the second largest (after the Andromeda Galaxy M31) but perhaps the most massive member of this group.M31,at about 2.9 million light years,is the nearest large galaxy,but a number of faint galaxies are much closer:Many of the dwarf Local Group members are satellites or companions of the Milky Way.The two closest neighbors,both already mentioned,have only recently been discovered:The nearest of all,discovered in 2003,is an already almost disrupted dwarf galaxy,the Canis Major Dwarf,the nucleus of which is about 25,000 light-years away from us and about 45,000 light-years from the Galactic Center.Second comes SagDEG at about 88,000 light years from us and some 50,000 light years from the Galactic Center.These two dwarfs are currently in close encounters with our Galaxy and in sections of their orbits situated well within the volume ocupied by our Milky Way.They are followed in distance by the more conspicuous Large and Small Magellanic Cloud,at 179,000 and 210,000 light years,respectively.

The spiral arms of our Milky Way contain interstellar matter,diffuse nebulae,and young stars and open star clusters emerging from this matter.On the other hand,the bulge component consists of old stars and contains the globular star clusters; our galaxy has probably about 200 globulars,of which we know about 150.These globular clusters are strongly concentrated toward the Galactic Center:From their apparent distribution in the sky,Harlow Shapley has concluded that this center of the Milky Way lies at a considerable distance (which he overestimated by factors) in the direction of Sagittarius and not rather close to us,as had been thought previously.

Our solar system is thus situated within the outer regions of this galaxy,well within the disk and only about 20 light years "above" the equatorial symmetry plane (to the direction of the Galactic North Pole,see below),but about 28,000 light years from the Galactic Center.Therefore,the Milky Way shows up as luminous band spanning all around the sky along this symmetry plane,which is also called the "Galactic Equator".Its center lies in the direction of the constellation Sagittarius,but very close to the border of both neighbor constellations Scorpius and Ophiuchus.The distance of 28,000 light years has recently (1997) been confirmed by the data of ESA's astrometric satellite Hipparcos.Other investigations published consequently have disputed this value and propose a smaller value of some 25,000 light years,based on stellar dynamics; a recent investigation (McNamara et.al 2000,based on RR Lyrae variables) yields roughly 26,000 light years.These data,if of significance,wouldn't immediately effect values for distances of particular objects in the Milky Way or beyond.

The solar system is situated within a smaller spiral arm,called the Local or Orion Arm,which is merely connection between the inner and outer next more massive arms,the Sagittarius Arm and the Perseus Arm; see our Milky Way Spiral Structure page.

Similar to other galaxies,there occur supernovae in the Milky Way at irregular intervals of time.If they are not too heavily obscurred by interstellar matter,they can be,and have been seen as spectacular events from Earth.Unfortunately,none has yet appeared since the invention of the telescope (the last well observed supernova was studied by Johannes Kepler in 1604).

Milky Way pictures are wide-field exposures.Besides being attractive and often colorful,they are often suited to view the Milky Way objects (including nebulae and star clusters) in their celestial surroundings of field stars.Some fields include lots of Messier objects and thus included here:

Milky Way central region including constellations Sagittarius,Scorpius,Ophiuchus and Scutum,and map of the Milky Way Central Region,by Bill Keel of the University of Alabama

Milky Way in Sagittarius,including portions of Scorpius and Ophiuchus

Milky Way around M17,M18,and M24

Our image was obtained by David Malin of the Anglo-Australian Observatory,and shows the many Messier objects around the direction of the Galactic Center.It is copyrighted and may be used for private purpose only.For any other kind of use,including internet mirroring and storing on CD-ROM,please contact the Photo Permissions Department (photo at aaoepp.aao.gov.au) of the Anglo Australian Observatory.

More information on this image by David Malin

Old style AAT image

In order to obtain a picture of the whole Milky Way as it appears from Earth,one must either compose a mosaic of many photographs (optionally computer-processed),or create a drawing; fine examples may be accessed below:

A good Milky Way photo mosaic

Knut Lundmark's drawing of the Milky Way

In the infrared light,the structure of the Milky Way can be better investigated,as the obscurring dust clouds are of better transparency for long wavelength IR than for the visible light.The Cobe satellite has provided an infrared image of the Milky Way's central region.

The central region of the Milky Way,as those of many other galaxies,is more densely crouded with stars than the outer region,and contains a massive central object,Sagittarius A*.

Below we give some data for the Galactic Center (this and all following positions for epoch 2000.0):

Right ascension 17 :45.6 (h :m)

Declination -28 :56 (deg :m)

Distance 28 (kly)

The Galactic North Pole is at

Right ascension 12 :51.4 (h :m)

Declination +27 :07 (deg :m)

The coordinate data given here were extracted from the online coordinate calculator at Nasa/IPAC's Extragalactical Database (NED) (also available by telnet).

Our Sun,together with the whole Solar System,is orbiting the Galactic Center at the distance given,on a nearly circular orbit.We are moving at about 250 km/sec,and need about 220 million years to complete one orbit (so the Solar System has orbited the Galactic Center about 20 to 21 times since its formation about 4.6 billion years ago).

In addition to the overall Galactic Rotation,the solar system is moving between the neighboring stars (peculiar motion) at a velocity of about 20 km/s,to a direction called "Solar Apex," at the approximate position RA=18:01,Dec=+26 (2000.0); this motion has been discovered by William Herschel in 1783.

Considering the sense of rotation,the Galaxy,at the Sun's position,is rotating toward the direction of Right Ascension 21:12.0,Declination +48:19.This shows that it rotates "backward" in the Galactic coordinate system,i.e.the Galactic North Pole is actually a physical South Pole with respect to galactic rotation (defined by the direction of the angular momentum vector).

问题3：选文第三段在说明银河系时,为什么要提到牛郎织女的故事[语文科目]

诗篇本身讲的就是情人之间爱而不得的惆怅及感慨,在说明银河系时提及牛郎织女有两个作用：

1 设计典故,使词更具浪漫主义情怀,不管是此人自己还是读者都更能体会到所要表达的意境；

2 情节上的升华.以银河系中牛郎织女来做衬,某方面来讲是同样的境遇,唯美的结局.

自己写的,望参考~

问题4：牛郎织女【解释】牛郎织女：大河之东有织女,天帝之女也.年年机杼劳役,织成云锦天衣,帝怜其独处,许嫁河西牵牛郎,嫁后逐废织衽.天帝怒,责令归河东,但使一年一度相会.七夕织女当渡河,使[语文科目]

1:答应或允许;

2:逐渐或慢慢地;

3:但是;可以;

4:作为;

5:旧的;

6:天帝的女儿,也,表肯定的判断词

7:是由于作为桥梁让织女渡过的缘故

8:注意,文中没有涉及自然现象,而是想像

9:

问题5：牛郎织女银河系的下联是什么?一定要是像牛郎织女一样前四个字组成一个神话又包括在后一词银河系里.

牛郎织女银河系,山伯英台蝴蝶结 牛郎织女银河系,星海聂耳雷振帮 牛郎织女银河系,范子孟姜山海关 牛郎织女银河系,许仙白蛇断桥缘 牛郎织女银河系,张生莺莺红娘牵 牛郎织女银河系,杨过龙女古墓情 牛郎织女银河系,许郎素珍雷峰塔 牛郎织女银河系,宝玉黛玉红楼梦 牛郎织女银河系,西施范蠡鼋头渚 牛郎织女银河系,吕布貂禅凤仪亭 恩...会不会写太多了...希望有中意的.