Copyright:
Christian vd Berge
(DSLR Astrophotograhy)
原文:
These three bright nebulae are often featured in 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 left of center, and colorful M20 on the right. The third, NGC 6559, is above M8, separated from the larger nebula by a dark dust lane. All three are stellar nurseries about five thousand light-years or so distant. The expansive M8, over a hundred light-years across, 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, with contrasting blue hues, most striking in the Trifid, due to dust reflected starlight. The colorful skyscape recorded with telescope and digital camera also includes one of Messier’s open star clusters, M21, just above the Trifid. Astrophysicists: Browse 1,000+ codes in the Astrophysics Source Code Library
中文翻譯:
這三個璀璨的星雲經常在天文望遠鏡的導覽中被介紹，特別是在射手座及中央銀河的繁星之中。事實上，18世紀的天文旅行者查爾斯·梅西耶（Charles Messier）將其中兩個星雲編入了他的目錄：M8，即左側的大星雲，以及右側色彩斑斕的M20。第三個星雲是NGC 6559，位於M8的上方，兩者之間被一條黑暗的塵埃帶隔開。這三個星雲都是約五千光年外的恆星誕生區。廣袤的M8，直徑超過一百光年，也被稱為濕地星雲（Lagoon Nebula）。而M20則以其流行的名字三裂星雲（Trifid）而聞名。發光的氫氣造就了這些發射星雲的主要紅色，三裂星雲中最明顯的藍色調則是由星塵反射星光所致。這幅充滿色彩的天空景觀由望遠鏡和數字相機共同拍攝，還包含梅西耶的開放星團M21，正好位於三裂星雲的上方。
#星雲 #濕地星雲 #三裂星雲 #天文學 #銀河 #恆星誕生 #深空 #射手座 #天文觀測 #梅西耶 #NGC6559 #淺藍色塵埃 #科學探索 #天文愛好者 #昇空美景
來源:NASA每日圖片
