射手座的三联体
(原标题: A Sagittarius Triplet)
2024-07-10
浏览次数: 18
这三个明亮的星云经常出现在人马座和银河系中心拥挤的星场的望远镜之旅中。事实上，18世纪的宇宙游客查尔斯·梅西耶（Charles Messier）记录了其中的两个；中央上方的大星云M8和画面左侧下方的彩色星云M20。第三个发射区域包括NGC 6559，位于M8的右边，被一条黑暗的尘埃带与较大的星云分开。这三个都是恒星托儿所，距离大约5000光年。横跨一百多光年的广阔的M8也被称为泻湖星云。M20的流行绰号是三叉戟。发光的氢气形成了发射星云的主要红色。但与之形成鲜明对比的是，三裂星云中的蓝色色调是由于尘埃反射的星光。广阔的星际天空几乎跨越了4度，相当于天空中的8个满月。
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These three bright nebulae are often featured on telescopic tours of the constellation Sagittarius and the crowded starfields of the central Milky Way. In fact, 18th century cosmic tourist Charles Messier cataloged two of them; M8, the large nebula above center, and colorful M20 below and left in the frame. The third emission region includes NGC 6559, right of M8 and separated from the larger nebula by a dark dust lane. All three are stellar nurseries about five thousand light-years or so distant. Over a hundred light-years across the expansive M8 is also known as the Lagoon Nebula. M20's popular moniker is the Trifid. Glowing hydrogen gas creates the dominant red color of the emission nebulae. But for striking contrast, blue hues in the Trifid are due to dust reflected starlight. The broad interstellar skyscape spans almost 4 degrees or 8 full moons on the sky.
© Andy Ermolli