Copyright:
Markus Noller
(Deep-Sky-Images)
原文:
Why is the sky near Antares and Rho Ophiuchi so colorful? The colors result from a mixture of objects and processes. Fine dust illuminated from the front by starlight produces blue reflection nebulae. Gaseous clouds whose atoms are excited by ultraviolet starlight produce reddish emission nebulae. Backlit dust clouds block starlight and so appear dark. Antares, a red supergiant and one of the brighter stars in the night sky, lights up the yellow-red clouds on the lower center of the featured image. Rho Ophiuchi lies at the center of the blue nebula on the left. The distant globular cluster M4 is visible to the upper right of center. These star clouds are even more colorful than humans can see, emitting light across the electromagnetic spectrum. Astrophysicists: Browse 1,000+ codes in the Astrophysics Source Code Library
中文翻譯:
為何安塔瑞斯（Antares）及蛇夫座（Rho Ophiuchi）附近的天空如此色彩斑斕？這些色彩是由多種物體和過程的混合所造成的。精細的塵埃在恆星光的照耀下產生藍色的反射星雲；而氣體雲中的原子受到紫外線恆星光的激發則產生紅色的發射星雲。背光的塵埃雲遮擋了恆星光，因而顯得暗淡。
安塔瑞斯是一顆紅超巨星，也是夜空中最亮的星星之一，照亮了圖像中央下方的黃紅色雲朵。而蛇夫座位於左側的藍色星雲中心。遠處的球形星團M4則位於圖像中央的右上方。這些星雲的顏色比人類可見的色彩更加鮮豔，因為它們在整個電磁波譜上發光。
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#安塔瑞斯 #Antares #蛇夫座 #RhoOphiuchi #星雲 #宇宙 #天文學 #色彩斑斕 #反射星雲 #發射星雲 #M4星團 #天文攝影 #太空之美 #深空探索 #天文愛好者
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來源:NASA每日圖片
