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                        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 December 10

                            The Horsehead Nebula
               Image Credit & Copyright: George Chatzifrantzis

   Explanation: Sculpted by stellar winds and radiation, this dusty
   interstellar molecular cloud has by chance has assumed an immediately
   recognizable shape. Fittingly known as The Horsehead Nebula, it lies
   some 1,500 light-years distant, embedded in the vast Orion cloud
   complex. About five light-years "tall," the dark cloud is cataloged as
   Barnard 33, first identified on a photographic plate taken in the late
   19th century. B33 is visible primarily because its obscuring dust is
   silhouetted against the glow of emission nebula IC 434. Hubble space
   telescope images from the early 21st century find young stars forming
   within B33. Of course, the magnificent interstellar cloud will slowly
   shift its apparent shape over the next few million years. But for now
   the Horsehead Nebula is a rewarding though difficult object to view
   with small telescopes from planet Earth.

                 Tomorrow's picture: the spectrum of the Sun
     __________________________________________________________________

       Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
            NASA Official: Amber Straughn Specific rights apply.
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