Astronomy Picture of the Day [1]Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2025 July 16 [2]A deep image of the Rosette Nebula is shown along with a field of stars. As many color filters were used, the flowery nebula takes on many colors with blue in the center, yellow and orange around the blue, and red around the outside. Please see the explanation for more detailed information. The Rosette Nebula from DECam Image Credit: [3]CTIO, [4]NOIRLab, [5]DOE, [6]NSF, [7]AURA; Processing: [8]T. A. Rector ([9]U. Alaska Anchorage), D. de Martin ([10]NSF’s [11]NOIRLab) & [12]M. Zamani Explanation: Would the [13]Rosette Nebula by any other [14]name look as sweet? The bland [15]New General Catalog designation of [16]NGC 2237 doesn't appear to diminish the appearance of [17]this flowery [18]emission nebula, as captured by the [19]Dark Energy Camera (DECam) on the [20]Blanco 4-meter telescope at the [21]NSF's [22]Cerro Tololo Inter-American Observatory in [23]Chile. Inside the nebula lies an [24]open cluster of bright young stars designated [25]NGC 2244. These stars [26]formed about four million years ago from the nebular material and their [27]stellar winds are [28]clearing a hole in the nebula's center, insulated by a layer of [29]dust and hot gas. [30]Ultraviolet light from the hot cluster stars causes the surrounding nebula to [31]glow. The [32]Rosette Nebula spans about 100 [33]light-years across, lies [34]about 5000 light-years away, and can be seen with a small telescope towards the [35]constellation of the Unicorn ([36]Monoceros). Open Science: [37]Browse 3,700+ codes in the Astrophysics Source Code Library Tomorrow's picture: 3I __________________________________________________________________ [38]< | [39]Archive | [40]Submissions | [41]Index | [42]Search | [43]Calendar | [44]RSS | [45]Education | [46]About APOD | [47]Discuss | [48]> __________________________________________________________________ Authors & editors: [49]Robert Nemiroff ([50]MTU) & [51]Jerry Bonnell ([52]UMCP) NASA Official: Amber Straughn [53]Specific rights apply. [54]NASA Web Privacy, [55]Accessibility, [56]Notices; A service of: [57]ASD at [58]NASA / [59]GSFC, [60]NASA Science Activation & [61]Michigan Tech. U. 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