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M51: Cosmic Whirlpool 
2005, January 
  
Digital image 
NASA 
S. Beckwith (STScI) Hubble Heritage Team, (STScI/AURA), ESA, NASA 
  
 
LL/36999 
  
Follow the handle of the Big Dipper away from the dipper's bowl, until you get to the handle's last bright star. Then, just slide your telescope a little south and west and you might find this stunning pair of interacting galaxies, the 51st entry in Charles Messier's famous catalog. Perhaps the original spiral nebula, the large galaxy with well defined spiral structure is also cataloged as NGC 5194. Its spiral arms and dust lanes clearly sweep in front of its companion galaxy (right), NGC 5195. The pair are about 31 million light-years distant and officially lie within the boundaries of the small constellation Canes Venatici. Though M51 looks faint and fuzzy in small, earthbound telescopes, this sharpest ever picture of M51 was made in January 2005 with the Advanced Camera for Surveys on board the Hubble Space Telescope.
 
This image was the "NASA - Astronomy Picture of the Day" - 2008, January 5. 
 

 
  
 
  
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