Astronomy Picture of the Day——猎户座内的星际云
The Interstellar Clouds of Orion
Image Credit & Copyright: AndrewKlinger
Explanation: The constellation of Orion ismuch more than three stars in a row. It is a direction in space that is richwith impressive nebulas. To better appreciate this well-known swath of sky, anew long exposure image was taken over several clear nights in January,February and March. After 23 hours of camera time and untold hours of imageprocessing, the featured collage in the light of hydrogen, oxygen, and sulfurwas produced spanning over 40 times the angular diameter of the Moon. Of themany interesting details that have become visible, one that particularly drawsthe eye is Barnard's Loop, the bright red orange arc just to the right of theimage center. The Rosette Nebula is not the giant orange nebula just to theleft of the image center -- that is larger but lesser known nebula known as theMeissa Ring. The Rosette Nebula is visible, though: it is the bright orange,blue and white nebula near the image bottom. The bright orange star just leftof the frame center is Betelgeuse, while the bright blue star on the upperright is Rigel. About those famous three stars that cross the belt of Orion theHunter -- in this busy frame they can be hard to locate, but a discerning eyewill find them just to the right of the image center.
猎户座内的星际云
猎户座是拥有一排多于三颗恒星的星座。这是一个富有壮丽星云的方向。为了更好地欣赏这个著名的天区，拍摄者在一月、二月和三月的多个晴朗夜晚拍摄了一组长曝光影像。经过23个小时的拍摄和更长时间的图像处理，这幅图像才制作完成，其实际大小为月球直径的40多倍，并呈现出氢、氧和硫所发出辉光。在众多可见的有趣细节中，最引人注目的是巴纳德环，即图像中心靠右侧的红橙色光弧。影像中心左侧的庞大橙色星并不是云玫瑰星云，它被称为梅萨环，是一个更为庞大但鲜为人知的星云。而玫瑰星云在图像的底部，它呈现出亮橙色、蓝色和白色光泽。图像中心左侧的亮橙色恒星是参宿四，而右上方的亮蓝色恒星是参宿七。这三颗著名的恒星分布在猎户腰带上，在这幅内容丰富的图像中，它们很难被发现，但是仔细看，会在图像中心右侧找到它们。
参考文献：
https://apod.nasa.gov/apod/image/1906/OrionDeep_Klinger_3181.jpg
近期文章：
Astronomy Picture of the Day——M63：向日葵星系