人马座的星云和星团
(原标题: Nebulas and Clusters in Sagittarius)
2025-09-17
浏览次数: 1538
你能在这张图中找出著名的天体吗？18世纪的天文学家查尔斯·梅西耶只记录了其中的两个星云：底部明亮的泻湖星云（M8）和右上角彩色的三叶星云（M20）。左边这个像猫爪的是NGC 6559，它比其他两个要暗得多。更难以发现的是左边的蓝色细丝，来自超新星遗迹（SNR G007.5-01.7）。它们的光芒来自少量发光的氧原子，它们是如此微弱，以至于仅仅在一种蓝色的环境下暴露了17个多小时才被唤醒。构成这幅恒星诞生和死亡场景的是两个星团：三裂星上方的疏散星团M21和左下方的球状星团NGC 6544。
查看原文解释
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.
© J. De Winter, C. Humbert, C. Robert & V. Sabet; Text: Ogetay Kayali (MTU)