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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.   
      
                                 2023 November 26   
       A dark and jagged hill is shown strewn with rocks. On the slope is a   
       white foggy area that appears to emanate from a non-descript place on   
            the rock face. Please see the explanation for more detailed   
                                   information.   
      
                     A Dust Jet from the Surface of Comet 67P   
                     Image Credit: ESA, Rosetta, MPS, OSIRIS;   
                         UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA   
      
      Explanation: Where do comet tails come from? There are no obvious   
      places on the nuclei of comets from which the jets that create comet   
      tails emanate. In 2016, though, ESA's Rosetta spacecraft not only   
      imaged a jet emerging from Comet 67P/Churyumov-Gerasimenko, but flew   
      right through it. Featured is a telling picture showing a bright plume   
      emerging from a small circular dip bounded on one side by a 10-meter   
      high wall. Analyses of Rosetta data show that the jet was composed of   
      both dust and water-ice. The rugged but otherwise unremarkable terrain   
      indicates that something likely happened far under the porous surface   
      to create the plume. This image was taken about two months before   
      Rosetta's mission ended with a controlled impact onto Comet 67P's   
      surface.   
      
                           Tomorrow's picture: eagle ray   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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