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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 February 20   
      
                           Aurora Over White Dome Geyser   
                      Image Credit & Copyright: Robert Howell   
      
      Explanation: Sometimes both heaven and Earth erupt. Colorful auroras   
      erupted unexpectedly a few years ago, with green aurora appearing near   
      the horizon and brilliant bands of red aurora blooming high overhead. A   
      bright Moon lit the foreground of this picturesque scene, while   
      familiar stars could be seen far in the distance. With planning, the   
      careful astrophotographer shot this image mosaic in the field of White   
      Dome Geyser in Yellowstone National Park in the western USA. Sure   
      enough, just after midnight, White Dome erupted -- spraying a stream of   
      water and vapor many meters into the air. Geyser water is heated to   
      steam by scalding magma several kilometers below, and rises through   
      rock cracks to the surface. About half of all known geysers occur in   
      Yellowstone National Park. Although the geomagnetic storm that caused   
      the auroras subsided within a day, eruptions of White Dome Geyser   
      continue about every 30 minutes.   
      
                         Tomorrow's picture: barred spiral   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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