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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.

                               2024 August 25
    A light-colored spherical body is shown mostly illuminated against a
   dark background. Many craters are visible. Unusual blue stripes meander
        on the surface. Please see the explanation for more detailed
                                information.

                  Fresh Tiger Stripes on Saturn's Enceladus
           Image Credit: NASA, ESA, JPL, SSI, Cassini Imaging Team

   Explanation: Do underground oceans vent through canyons on Saturn's
   moon Enceladus? Long features dubbed tiger stripes are known to be
   spewing ice from the moon's icy interior into space, creating a cloud
   of fine ice particles over the moon's South Pole and creating Saturn's
   mysterious E-ring. Evidence for this has come from the robot Cassini
   spacecraft that orbited Saturn from 2004 to 2017. Pictured here, a high
   resolution image of Enceladus is shown from a close flyby. The unusual
   surface features dubbed tiger stripes are visible in false-color blue.
   Why Enceladus is active remains a mystery, as the neighboring moon
   Mimas, approximately the same size, appears quite dead. An analysis of
   ejected ice grains has yielded evidence that complex organic molecules
   exist inside Enceladus. These large carbon-rich molecules bolster --
   but do not prove -- that oceans under Enceladus' surface could contain
   life.

                Explore Your Universe: Random APOD Generator
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       Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
            NASA Official: Amber Straughn Specific rights apply.
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                      A service of: ASD at NASA / GSFC,
                           NASA Science Activation
                             & Michigan Tech. U.

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