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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.   
      
                                 2021 November 28   
      
                    A High Cliff on Comet Churyumov-Gerasimenko   
        Image Credit & Licence: ESA, Rosetta spacecraft, NAVCAM; Additional   
                            Processing: Stuart Atkinson   
      
      Explanation: This high cliff occurs not on a planet, not on a moon, but   
      on a comet. It was discovered to be part of the dark nucleus of Comet   
      Churyumov-Gerasimenko (CG) by Rosetta, a robotic spacecraft launched by   
      ESA that rendezvoused with the Sun-orbiting comet in 2014. The ragged   
      cliff, as featured here, was imaged by Rosetta in 2014. Although   
      towering about one kilometer high, the low surface gravity of Comet CG   
      would likely make it an accessible climb -- and even a jump from the   
      cliff survivable. At the foot of the cliff is relatively smooth terrain   
      dotted with boulders as large as 20 meters across. Data from Rosetta   
      indicates that the ice in Comet CG has a significantly different   
      deuterium fraction -- and hence likely a different origin -- than the   
      water in Earth's oceans. Rosetta ended its mission with a controlled   
      impact onto Comet CG in 2016. Comet CG has just completed another close   
      approach to Earth and remains visible through a small telescope.   
      
                       Tomorrow's picture: stellar pinwheel   
        __________________________________________________________________   
      
          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   
                                & Michigan Tech. U.   
      
      
      
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