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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.   
      
                                 2025 November 23   
        A diagram is shown depicting various parts of the universe that are   
       observable. In the middle are the parts closest to Earth, and around   
      the far edges are parts furthest from Earth. Planets, galaxies, and the   
         CMB are illustrated. Please see the explanation for more detailed   
                                   information.   
      
                              The Observable Universe   
          Illustration Credit & Licence: Wikipedia, Pablo Carlos Budassi   
      
      Explanation: How far can you see? Everything you can see, and   
      everything you could possibly see, right now, assuming your eyes could   
      detect all types of radiations around you -- is the observable   
      universe. In light, the farthest we can see comes from the cosmic   
      microwave background, a time 13.8 billion years ago when the universe   
      was opaque like thick fog. Some neutrinos and gravitational waves that   
      surround us come from even farther out, but humanity does not yet have   
      the technology to detect them. The featured image illustrates the   
      observable universe on an increasingly compact scale, with the Earth   
      and Sun at the center surrounded by our Solar System, nearby stars,   
      nearby galaxies, distant galaxies, filaments of early matter, and the   
      cosmic microwave background. Cosmologists typically assume that our   
      observable universe is just the nearby part of a greater entity known   
      as "the universe" where the same physics applies. However, there are   
      several lines of popular but speculative reasoning that assert that   
      even our universe is part of a greater multiverse where either   
      different physical constants occur, different physical laws apply,   
      higher dimensions operate, or slightly different-by-chance versions of   
      our standard universe exist.   
      
              Explore the Observable Universe: Random APOD Generator   
                      Tomorrow's picture: stellar shell game   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
                     NASA Web Privacy, Accessibility, Notices;   
                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
   --- BBBS/Li6 v4.10 Toy-7   
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