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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.   
      
                                    2022 June 8   
      
                        Ship Tracks over the Pacific Ocean   
            Image Credit: NASA, Terra, MODIS; Text: Raymond Shaw (MTU)   
      
      Explanation: What are those unusual streaks? Some images of planet   
      Earth show clear bright streaks that follow the paths of ships. Known   
      as ship tracks, these low and narrow bands are caused by the ship's   
      engine exhaust. Water vapor condenses around small bits of exhaust   
      known as aerosols, which soon grow into floating water drops that   
      efficiently reflect sunlight. Ship tracks were first discovered in 1965   
      in Earth images taken by NASA's TIROS satellites. Multiple ship tracks   
      are visible across the featured image that was captured in 2009 over   
      the Pacific Ocean by the MODIS instrument on NASA's Terra satellite.   
      Inspired by ship-tracks, some scientists have suggested deploying a   
      network of floating buoys in the worlds' oceans that spray salt-aerosol   
      containing sea-water into the air so that, with the help of the wind,   
      streams of sunlight-reflecting clouds would also form. Why do this?   
      These human-made clouds could reflect so much sunlight they might help   
      fight global warming.   
      
                            Today is: World Oceans Day   
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          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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