                        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.

                                2026 March 18
      Clouds of gas glow red in the night sky above a dark tree on the
    horizon that stands in a meadow. Please see the explanation for more
                            detailed information.

                        Cygnus and the Solitary Tree
        Image Credit & Copyright: 2025 Horacio Lander / AstroHoracio
         Text: Keighley Rockcliffe (NASA GSFC, UMBC CSST, CRESST II)

   Explanation: A lone tree stands in a quiet meadow in Guadalajara,
   Spain, silhouetted against the Cygnus region rising above like flames
   in the night sky. This deep night skyscape is a composite of exposures
   that reveals a range of brightness and color human eyes can't quite see
   on their own. Spanning over a thousand times the angular size of the
   full moon, Cygnus sets the sky afire with active star formation where
   clouds of gas and dust collapse under gravity until nuclear fusion
   ignites and new stars are born. These stars ionize the surrounding
   hydrogen gas, causing it to glow crimson, while tendrils of
   interstellar dust absorb some of that light and cast dark shadows
   across the sky. Cygnus is a trove of celestial treasures, notably the
   Veil, Crescent, and Pelican nebulae, as well as Cygnus X-1, the first
   confirmed black hole. Cygnus continues to yield fresh science,
   including a new three-dimensional model of the Cygnus Loop made
   possible by the Chandra X-ray Observatory.

                  Almost Hyperspace: Random APOD Generator
                      Tomorrow's picture: A Jellyfish!
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       Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
            NASA Official: Amber Straughn Specific rights apply.
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                             & Michigan Tech. U.

