x
uploads/spiral galaxy.jpg

spiral galaxy 【天文學】螺旋星系。

spirality

“ if you start with a pair of spiral galaxies like the milky way and you put them into this collision process , a billion years later you have one galaxy but it ' s no longer a spiral - - it ' s probably an elliptical galaxy , “ says barnes 巴尼斯說: “如果你著手于一對像‘銀河’這樣的螺旋形星系并將其置于撞擊的過程當中, 10億年之后就會有一個新的星系,但是已經不是螺旋形的了? ?很可能是橢圓形的。 ”

( 2 ) base on the complete sample of 178 spiral galaxies in the virgo cluster given by fouque et al . ( 1990 ) , the sv orientation distribution of the spiral galaxies with known galactic inclinations is studied ( 2 )利用fouqueetal . ( 1990 )所得的帶有傾角數據的完備的virgo團旋渦星系樣本,對virgo團旋渦星系旋轉矢量分布進行了統計分析。

Though the details are still not clear , it seems that the growth of the black hole is intimately related to the growth of the spheroidal component - an elliptical galaxy , or the bulge of a spiral galaxy - in which it lives 雖然細節仍然不清晰,好象黑洞生長與類星體生長密切有關-一個橢圓的星系,或螺旋形的星系-它在里面的星系凸起。

In our own milky way , which is quite typical of nearby , massive spiral galaxies , the number of observed high - mass stars indicates that stars are forming at a rate of a few solar masses a year 銀河系可說是我們周遭大質量螺旋星系的典型,根據觀測到的大質量恒星數目判斷,銀河系的恒星形成率為每年數個太陽質量。

Whether an entire galaxy becomes a disk is a timing issue : spiral galaxies emerge from gas that becomes rotationally supported before patches of the gas contract into stars 至于整個星系變成一個圓盤則是時機問題:螺旋星系的出現,是因為在每一小團氣體因收縮而形成恒星前,整團氣體已經成為旋轉性支撐。

Through the optical telescope , ngc 6240 is shaped like a butterfly . it is so odd - looking because it is in fact the result of the collision of two spiral galaxies 以光學觀測, ngc 6240的形狀就像一只蝴蝶,它之所以這樣古怪,是因為它其實是兩個旋渦狀星系撞的結果。

The hubble space telescope captured the light variation of o e of the cepheids inside the spiral galaxy m100 which is at a distance of 56 million light years away from earth 距離地球五千六百萬光年的旋渦星系m100內,哈勃太空望遠鏡拍得當中一顆造父變星的光度變化

Orbital velocities in spiral galaxies , instead of declining with increasing distance from the galactic center , flatten out to a constant value , as predicted by mond 螺旋星系中的軌道速度并不會隨著離開星系中心的距離增加而不停降低,它會平緩下來成為一固定值。

Andromeda , a large spiral galaxy much like our milky way galaxy , is relatively nearby and can be easily seen with binoculars in the autumn sky 仙女座大星云是類似銀河系的大型旋渦星系,距離我們相對較近,在秋季的星空下,用雙筒望遠鏡就可以很容易地看到它。

As an astronomy fan , you probably know that picture is a spiral galaxy . but i guess most of you will not have any idea what kinds of object pictures to are 作為天文愛好者,你或許知道圖a是個旋渦星系,至于圖b至圖e ,是不是有點困難呢?

Through a time - lapse computer - generated simulation representing millions of years , two spiral galaxies collide , eventually merging into a single galaxy 電腦模擬展示了歷時數百萬年的星際碰撞兩個旋渦星系由碰撞漸漸匯合成一個新的星系。

We , including our sun and the solar system are in one galaxy , the milky way galaxy , which is a fairly typical spiral galaxy 星系是可見宇宙結構的基本單位,例如人類太陽以至整個太陽系便皆處身于我們稱為銀河系的一個典型旋渦星系里面。

Collisions also can transform the shape of galaxies involved ; specifically , the merger of two spiral galaxies may produce a single elliptical galaxy 碰撞也會改變星系的外形,特別是當兩螺旋星系融合后可能會產生單一的橢圓星系。

There are sub - classes for the elliptical and spiral galaxies . they are summarized in the following figure that was first worked out by hubble 橢圓及旋渦星系皆可根據天文學家哈勃首創的方法再細分為次型,有如下圖所示。

Because gas constitutes only a few percent of the mass of spiral galaxies , modelers had neglected it to make the simulations more tractable 由于氣體只占螺旋星系質量幾個百分點,研究人員為使模擬較容易處理而將之省略。

That might happen during the collision of two spiral galaxies , which have lots of spare gas available for making new stars 這種情況很可能發生在兩個螺旋星系碰撞時,因為這會剩下大量的氣體,可供制造新的恒星。

At least some elliptical galaxies , as well as the bulges and halos of spiral galaxies , may have arisen from such collisions 至少螺旋星系的核球與暈,以及某些橢圓星系,可能是由此種碰撞產生的。

Elliptical galaxies have much less dust and gas than spiral galaxies have , and few new stars appear to be forming in them 橢圓星系中的氣體和塵埃比旋渦星系要少得多,貌似其內部也少有恒星誕生。

As far as astronomers can determine , elliptical galaxies rotate much more slowly than spiral galaxies or not at all 直到天文學家能夠測定,橢圓星系自轉要比旋渦星系慢的多或者根本不旋轉。