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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.   
      
                                    2025 May 16   
      
                                    Messier 101   
                       Image Credit: NASA, ESA, CFHT, NOAO;   
        Acknowledgement - K.Kuntz (GSFC), F.Bresolin (U.Hawaii), J.Trauger   
                   (JPL), J.Mould (NOAO), Y.-H.Chu (U. Illinois)   
      
      Explanation: Big, beautiful spiral galaxy M101 is one of the last   
      entries in Charles Messier's famous catalog, but definitely not one of   
      the least. About 170,000 light-years across, this galaxy is enormous,   
      almost twice the size of our own Milky Way. M101 was also one of the   
      original spiral nebulae observed by Lord Rosse's large 19th century   
      telescope, the Leviathan of Parsontown. Assembled from 51 exposures   
      recorded by the Hubble Space Telescope in the 20th and 21st centuries,   
      with additional data from ground based telescopes, this mosaic spans   
      about 40,000 light-years across the central region of M101 in one of   
      the highest definition spiral galaxy portraits ever released from   
      Hubble. The sharp image shows stunning features of the galaxy's face-on   
      disk of stars and dust along with background galaxies, some visible   
      right through M101 itself. Also known as the Pinwheel Galaxy, M101 lies   
      within the boundaries of the northern constellation Ursa Major, about   
      25 million light-years away.   
      
                    Tomorrow's picture: (The) Martian landscape   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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