Astronomy Picture of the Day——宇宙玫瑰，麒麟座内的玫瑰星云
A Cosmic Rose: The Rosette Nebula inMonoceros
Image Credit & Copyright: Jean Dean
Explanation: The Rosette Nebula, NGC 2237,is not the only cosmic cloud of gas and dust to evoke the imagery of flowers,but it is the most famous. At the edge of a large molecular cloud in Monoceros some 5,000 light years away, the petals of this cosmic rose are actually astellar nursery. The lovely, symmetric shape is sculpted by the winds andradiation from its central cluster of hot young, Otype stars. Stars in theenergetic cluster, cataloged as NGC 2244, are only a few million years young,while the central cavity in the Rosette Nebula, is about 50 light years indiameter. The nebula can be seen with a small telescope toward the constellationof Monoceros, the Unicorn. This natural appearing telescopic portrait of theRosette Nebula was made using broadband and narrowband filters, becausesometimes roses aren't red.
一朵宇宙玫瑰：麒麟座内的玫瑰星云
玫瑰星云也被称为NGC 2237，它虽然不是唯一让人联想到花朵的宇宙气体和尘埃云，但却是最出名的。它距离地球约5000光年，在麒麟座巨大分子云的边缘，这朵玫瑰的花瓣实际上是个恒星孕育场。其可爱又对称的形状是由于中央炽热的O型恒星发出的恒星风的侵蚀而成。高能星团内的恒星被编录为NGC 2244，年龄只有几百万年，而玫瑰星云的中央空洞直径约有50光年。用小型望远镜朝着麒麟座方向就能找到这片星云。这张展现自然色玫瑰星云的影像是利用宽带和窄带滤波片拍摄得到，因为有时玫瑰并非红色。
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