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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.   
      
                                    2024 July 1   
       An illustrated spiral is shown depicting many significant events that   
      have occurred since the big bang. The big bang is at the center, and a   
      city built by humans is at the spiral's end. Please see the explanation   
                          for more detailed information.   
      
                                    Time Spiral   
              Illustration Credit: Pablo Carlos Budassi via Wikipedia   
      
      Explanation: What's happened since the universe started? The time   
      spiral shown here features a few notable highlights. At the spiral's   
      center is the Big Bang, the place where time, as we know it, began   
      about 13.8 billion years ago. Within a few billion years atoms formed,   
      then stars formed from atoms, galaxies formed from stars and gas, our   
      Sun formed, soon followed by our Earth, about 4.6 billion years ago.   
      Life on Earth begins about 3.8 billion years ago, followed by cells,   
      then photosynthesis within a billion years. About 1.7 billion years   
      ago, multicellular life on Earth began to flourish. Fish began to swim   
      about 500 million years ago, and mammals because walking on land about   
      200 million years ago. Humans first appeared only about 6 million years   
      ago, and made the first cities only about 10,000 years ago. The time   
      spiral illustrated stops there, but human spaceflight might be added,   
      which started only 75 years ago, and useful artificial intelligence   
      began to take hold within only the past few years.   
      
                   Explore Your Universe: Random APOD Generator   
                         Tomorrow's picture: oyster stars   
        __________________________________________________________________   
      
          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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