Copyright:
Jos� Jim�nez Priego
原文:
The Horsehead Nebula is one of the most famous nebulae on the sky. It is visible as the dark indentation to the red emission nebula in the center of the above photograph. The horse-head feature is dark because it is really an opaque dust cloud that lies in front of the bright red emission nebula. Like clouds in Earth’s atmosphere, this cosmic cloud has assumed a recognizable shape by chance. After many thousands of years, the internal motions of the cloud will surely alter its appearance. The emission nebula’s red color is caused by electrons recombining with protons to form hydrogen atoms. On the image left is the Flame Nebula, an orange-tinged nebula that also contains filaments of dark dust. Just to the lower left of the Horsehead nebula featured picture is a blueish reflection nebulae that preferentially reflects the blue light from nearby stars. Free APOD Lectures: Editor to Speak in January in Philadelphia and New York City
中文翻譯:
🌌 馬頭星雲（Horsehead Nebula）係天空上最著名的星雲之一。在上面的照片中，馬頭特徵呈現為紅色發射星雲中間的黑暗凹陷。馬頭形狀之所以顯得黑暗，是因為佢其實係一個不透明的塵雲，位於明亮的紅色發射星雲前面。就像地球大氣中的雲一樣，這個宇宙雲因機緣巧合而形成可辨認的形狀。經過數千年後，雲內部的運動肯定會改變其外觀。發射星雲的紅色是由於電子與質子重新結合形成氫原子所造成的。圖片左邊是火焰星雲（Flame Nebula），這個帶有橙色的星雲中也包含有黑暗塵埃的絲狀結構。在馬頭星雲的左下方，有一個偏藍的反射星雲，主要反射附近恆星的藍光。
🪐 #馬頭星雲 #HorseheadNebula #火焰星雲 #FlameNebula #宇宙探索 #星際尘埃 #天文學 #CosmicWonder #SpacePhotography #AstronomyLovers #星雲 #月球 #星際旅行
來源:NASA每日圖片
