                        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.

                                2023 April 3
    A false-color yellow-on red radio image of our Galactic Center shows
      yellow radio-emitting arcs above streaks and a bright cocoon that
    contains our Galaxy's central black hole. Please see the explanation
                       for more detailed information.

                        The Galactic Center Radio Arc
                Image Credit: Ian Heywood (Oxford U.), SARAO;

   Explanation: What causes this unusual curving structure near the center
   of our Galaxy? The long parallel rays slanting across the top of the
   featured radio image are known collectively as the Galactic Center
   Radio Arc and point out from the Galactic plane. The Radio Arc is
   connected to the Galactic Center by strange curving filaments known as
   the Arches. The bright radio structure at the bottom right surrounds a
   black hole at the Galactic Center and is known as Sagittarius A*. One
   origin hypothesis holds that the Radio Arc and the Arches have their
   geometry because they contain hot plasma flowing along lines of a
   constant magnetic field. Images from NASA's Chandra X-ray Observatory
   appear to show this plasma colliding with a nearby cloud of cold gas.

                     Tomorrow's picture: from inner mars
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