Copyright:Astro Anarchy
原文:
Chaotic in appearance, these filaments of shocked, glowing gas break across planet Earth’s sky toward the constellation of Cygnus, as part of the Veil Nebula. The Veil Nebula itself is a large supernova remnant, an expanding cloud born of the death explosion of a massive star. Light from the original supernova explosion likely reached Earth over 5,000 years ago. Blasted out in the cataclysmic event, the interstellar shock waves plow through space sweeping up and exciting interstellar material. The glowing filaments are really more like long ripples in a sheet seen almost edge on, remarkably well separated into the glow of ionized hydrogen and sulfur atoms shown in red and green, and oxygen in blue hues. Also known as the Cygnus Loop, the Veil Nebula now spans nearly 3 degrees or about 6 times the diameter of the full Moon. While that translates to over 70 light-years at its estimated distance of 1,500 light-years, this field of view spans less than one third that distance. Identified as Pickering’s Triangle for a director of Harvard College Observatory and cataloged as NGC 6979, the complex of filaments might be more appropriately known as Williamina Fleming’s Triangular Wisp.
中文翻譯:
這些看似混亂的發光氣體絲線穿越地球的天空，朝著天鵝座的方向延伸，構成了維爾星雲。維爾星雲本身是一個大型的超新星殘骸，是一顆大質量恆星死亡爆炸後產生的擴展雲氣。來自原始超新星爆炸的光，在5000多年前很可能就已經抵達地球。這場災難性的事件中爆炸出的星際震波穿過太空，掃蕩並激發著星際物質。這些發光的絲線實際上更像是一塊幾乎邊緣向上的薄膜中的長波紋，分別呈現出被電離的氫和硫原子（紅色和綠色）以及氧（藍色）的光芒。維爾星雲，又稱為天鵝環，現在的直徑近3度，約為滿月直徑的六倍。這相當於在其約1500光年的距離上，跨越了70光年，而這個視野範圍的距離還不到三分之一。被識別為皮克林的三角形，紀念哈佛天文台的主任，並且編入NGC 6979，這組絲狀結構或許更適當地被稱為威廉娜·弗萊明的三角絲。
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來源:NASA每日圖片
