NGC 1232 :宏觀螺旋星系
NGC 1232: A Grand Design Spiral Galaxy

發表日期:2024-01-01
星系的魅力不僅在於它的可見性,還在於它的不可見性。大螺旋星系 NGC 1232 就是一個很好的例子,其中一個甚大望遠鏡捕捉到了它的細節。 數以百萬計的明亮恆星和暗色塵埃被捲入圍繞中心旋轉的旋臂引力漩渦中,成為可見的主宰。沿著這些旋臂可以看到散佈著明亮藍色恆星的疏散星團,而在它們之間則可以看到散佈著濃密星際塵埃的暗道。數十億顆暗淡的普通恆星和大量的星際氣體雖然不那麼顯眼,但也能被探測到,它們的質量非常大,主導著內銀河系的動力學。 主要的理論表明,還有更多的物質是不可見的,其形式我們還不知道。據推測,這種無處不在的暗物質在一定程度上可以解釋星系外部區域可見物質的運動。 免費 APOD 講座: 2024 年 1 月 9 日,紐約業餘天文學家協會
原文:Galaxies are fascinating not only for what is visible, but for what is invisible. Grand spiral galaxy NGC 1232, captured in detail by one of the Very Large Telescopes, is a good example. The visible is dominated by millions of bright stars and dark dust, caught up in a gravitational swirl of spiral arms revolving about the center. Open clusters containing bright blue stars can be seen sprinkled along these spiral arms, while dark lanes of dense interstellar dust can be seen sprinkled between them. Less visible, but detectable, are billions of dim normal stars and vast tracts of interstellar gas, together wielding such high mass that they dominate the dynamics of the inner galaxy. Leading theories indicate that even greater amounts of matter are invisible, in a form we don't yet know. This pervasive dark matter is postulated, in part, to explain the motions of the visible matter in the outer regions of galaxies. Free APOD Lecture: January 9, 2024 to the Amateur Astronomers of Association of New York
※ 本文由萌芽機器人自動轉貼自每日一天文圖(Astronomy Picture of the Day,APOD),原文為英文,正體中文是透過 DeepL 翻譯及 OpenCC 進行自動處理,內容僅供參考,若有任何錯誤之處還請見諒!
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