                        Astronomy Picture of the Day

    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 June 25

                 Rubin's First Look: A Sagittarius Skyscape
          Image Credit & License: NSF–DOE Vera C. Rubin Observatory

   Explanation: This interstellar skyscape spans over 4 degrees across
   crowded starfields toward the constellation Sagittarius and the central
   Milky Way. A First Look image captured at the new NSF–DOE Vera C. Rubin
   Observatory, the bright nebulae and star clusters featured include
   famous stops on telescopic tours of the cosmos: Messier 8 and Messier
   20. An expansive star-forming region over a hundred light-years across,
   Messier 8 is also known as the Lagoon Nebula. About 4,000 light-years
   away the Lagoon Nebula harbors a remarkable cluster of young, massive
   stars. Their intense radiation and stellar winds energize and agitate
   this cosmic lagoon's turbulent depths. Messier 20's popular moniker is
   the Trifid. Divided into three parts by dark interstellar dust lanes,
   the Trifid Nebula's glowing hydrogen gas creates its dominant red
   color. But contrasting blue hues in the colorful Trifid are due to dust
   reflected starlight. The Rubin Observatory visited the Trifid-Lagoon
   field to acquire all the image data during parts of four nights (May
   1-4). At full resolution, Rubin's magnificent Sagittarius skyscape is
   84,000 pixels wide and 51,500 pixels tall.

                     Tomorrow's picture: pixels in space
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       Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
            NASA Official: Amber Straughn Specific rights apply.
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                           NASA Science Activation
                             & Michigan Tech. U.

