APOD: 2026 September 21 – Cocoon Nebula Wide Field
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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 lower right, with a long trail of interstellar dust clouds to the left, 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 dust y tail spans nearly 100 light years. Both are located about 2,500 light years away. A bright star near the colorful nebula’s center likely supplies power and helps clear out a cavity. The long dusty filaments of the tail, although dark in this visible light image, hide stars in the process of formation . The featured image was captured in July from Death Valley , California , USA . APOD’s main NASA site is moving : From apod.nasa.gov to science.nasa.gov/apod Tomorrow’s picture: triple eclipse
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