Copyright:Francesco
di Biase
原文:
While hunting for comets in the skies above 18th century France, astronomer Charles Messier diligently kept a list of the things he encountered that were definitely not comets. This is number 27 on his now famous not-a-comet list. In fact, 21st century astronomers would identify it as a planetary nebula, but it’s not a planet either, even though it may appear round and planet-like in a small telescope. Messier 27 (M27) is an excellent example of a gaseous emission nebula created as a sun-like star runs out of nuclear fuel in its core. The nebula forms as the star’s outer layers are expelled into space, with a visible glow generated by atoms excited by the dying star’s intense but invisible ultraviolet light. Known by the popular name of the Dumbbell Nebula, the beautifully symmetric interstellar gas cloud is over 2.5 light-years across and about 1,200 light-years away in the constellation Vulpecula. This impressive color composite highlights details within the well-studied central region and fainter, seldom imaged features in the nebula’s outer halo. It incorporates broad and narrowband images recorded using filters sensitive to emission from sulfur, hydrogen and oxygen atoms.
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在18世紀法國尋找彗星的天文學家查爾斯·梅西耶（Charles Messier）認真地整理了一份他遇到的明顯不是彗星的物體名單。這是他著名的不是彗星名單上的第27項。事實上，21世紀的天文學家會將其認定為行星狹縫，但它也不是一顆行星，雖然在小型望遠鏡中看起來圓圓的、像一顆行星。梅西耶27（M27）是一個優秀的例子，展示了一顆類太陽星在其核心燃料耗盡時形成的氣體發射星雲。當這顆星的外層被噴出到太空中時，星雲就會形成，而可見的光芒是由於死去的星星的強烈但不可見的紫外線光照激發的原子所產生的。這個以「啞鈴星雲」（Dumbbell Nebula）著稱的美麗對稱的星際氣體雲長達超過2.5光年，距離地球約1200光年，位於小狐狸座（Vulpecula）內。這張令人印象深刻的彩色合成圖展示了在研究得很透徹的中央區域內的細節，以及星雲外圍光暈中鮮有影像的細微特徵。它結合了使用對硫、氫和氧原子輻射敏感的濾鏡錄製的廣角和窄帶影像。
#梅西耶27 #啞鈴星雲 #行星狹縫 #天文學 #星雲 #小狐狸座 #夜空探索 #天文圖片 #宇宙之美 #星際氣體雲
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來源:NASA每日圖片
