A red emission nebula is shown against a busy starfield with many dark dust filaments near the nebula’s center. Near the bottom of the image is a smaller blue reflection nebula. Please see the explanation for more detailed information.
红色发射星云映衬着繁华的星场，星云中心附近有许多尘埃暗条。图片底部附近是一个较小的蓝色反射星云。有关更多详细信息，请参阅说明。
2022年10月26日 Cocoon Nebula Wide Field Image Credit & Copyright: Andy Ermolli Explanation: When does a nebula look like a comet? In this crowded starfield, covering over two degrees within the high flying constellation of the Swan (Cygnus), the eye is drawn to the Cocoon Nebula. A compact star forming region, the cosmic Cocoon punctuates a nebula bright in emission and reflection on the left, with a long trail of interstellar dust clouds to the right, making the entire complex appear a bit like a comet. Cataloged as IC 5146, the central bright head of the nebula spans about 10 light years, while the dark dusty tail spans nearly 100 light years. Both are located about 2,500 light years away. The bright star near the bright…
