射手座的星雲和星團
Nebulas and Clusters in Sagittarius

來源:J. De Winter,
C. Humbert,
C. Robert &
V. Sabet;
Text: Ogetay Kayali
(MTU)|發表日期:2025-09-17
你能在這張圖片中發現著名的天體嗎? 18 世紀的天文學家查爾斯-梅西耶(Charles Messier)只記錄了其中的兩個:底部明亮的礁湖星雲(M 8 )和右上方色彩斑斕的三葉星雲(M 20 )。 左邊那個像貓爪一樣的星雲是NGC 6559 ,它比其他兩個要暗得多。 更難發現的是左邊的藍色細絲,它來自超新星遺蹟(SNR G 007 . 5 - 01 . 7 )。 它們的光輝來自於少量發光的氧原子,這些氧原子非常微弱,需要曝光 17 個多小時才能呈現出一種藍色。在這個恆星誕生和死亡的場景中,有兩個星團:三葉草上方的疏散星團 M 21 和左下方的球狀星團 NGC 6544 。
原文:Can you spot famous celestial objects in this image? 18th-century astronomer Charles Messier cataloged only two of them: the bright Lagoon Nebula (M8) at the bottom, and the colorful Trifid Nebula (M20) at the upper right. The one on the left that resembles a cat's paw is NGC 6559, and it is much fainter than the other two. Even harder to spot are the thin blue filaments on the left, from supernova remnant (SNR G007.5-01.7). Their glow comes from small amounts of glowing oxygen atoms that are so faint that it took over 17 hours of exposure with just one blue color to bring up. Framing this scene of stellar birth and death are two star clusters: the open cluster M21 just above Trifid, and the globular cluster NGC 6544 at lower left.
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