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   CHRS: LATIN-1 2   
                           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.   
      
                                    2023 July 5   
      A map of the observable universe is illustrated in a wedge with the the   
      Earth on the bottom and the universe fanning out above. Please see the   
                    explanation for more detailed information.   
      
                         A Map of the Observable Universe   
      Image Credit & Copyright: B. M+¬nard & N. Shtarkman; Data: SDSS, Planck,   
                               JHU, Sloan, NASA, ESA   
      
      Explanation: What if you could see out to the edge of the observable   
      universe? You would see galaxies, galaxies, galaxies, and then, well,   
      quasars, which are the bright centers of distant galaxies. To expand   
      understanding of the very largest scales that humanity can see, a map   
      of the galaxies and quasars found by the Sloan Digital Sky Survey from   
      2000 to 2020 -- out to near the edge of the observable universe -- has   
      been composed. Featured here, one wedge from this survey encompasses   
      about 200,000 galaxies and quasars out beyond a look-back time of 12   
      billion years and cosmological redshift 5. Almost every dot in the   
      nearby lower part of the illustration represents a galaxy, with redness   
      indicating increasing redshift and distance. Similarly, almost every   
      dot on the upper part represents a distant quasar, with blue-shaded   
      dots being closer than red. Clearly shown among many discoveries,   
      gravity between galaxies has caused the nearby universe to condense and   
      become increasingly more filamentary than the distant universe.   
      
                    More Detailed Maps: Related to Today's APOD   
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
                   NASA Web Privacy Policy and Important Notices   
                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
   --- BBBS/Li6 v4.10 Toy-6   
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