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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 July 30
      Four images of the Sun's edge are shown. In each a loop of bright
        material is captured above the Sun's surface. Please see the
                 explanation for more detailed information.

                          Coronal Loops on the Sun
                   Image Credit & Copyright: Andrea Vanoni

   Explanation: Our Sun frequently erupts in loops. Hot solar plasma jumps
   off the Sun's surface into prominences, with the most common type of
   prominence being a simple loop. The loop shape originates from the
   Sun's magnetic field, which is traced by spiraling electrons and
   protons. Many loops into the Sun's lower corona are large enough to
   envelop the Earth and are stable enough to last days. They commonly
   occur near active regions that also include dark sunspots. The featured
   panel shows four loops, each of which was captured near the Sun's edge
   during 2024 and 2025. The images were taken by a personal telescope in
   Mantova, Italy and in a very specific color of light emitted primarily
   by hydrogen. Some solar prominences suddenly break open and eject
   particles into the Solar System, setting up a space weather sequence
   that can affect the skies and wires of Earth.

                Jigsaw Universe: Astronomy Puzzle of the Day
                       Tomorrow's picture: open space
     __________________________________________________________________

       Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
            NASA Official: Amber Straughn Specific rights apply.
                  NASA Web Privacy, Accessibility, Notices;
                      A service of: ASD at NASA / GSFC,
                           NASA Science Activation
                             & Michigan Tech. U.

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