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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.   
      
                                  2022 August 14   
      
                                  4000 Exoplanets   
         Video Credit: SYSTEM Sounds (M. Russo, A. Santaguida); Data: NASA   
                                 Exoplanet Archive   
      
      Explanation: Over 4000 planets are now known to exist outside our Solar   
      System. Known as exoplanets, this milestone was passed last month, as   
      recorded by NASA's Exoplanet Archive. The featured video highlights   
      these exoplanets in sound and light, starting chronologically from the   
      first confirmed detection in 1992 and continuing into 2019. The entire   
      night sky is first shown compressed with the central band of our Milky   
      Way Galaxy making a giant U. Exoplanets detected by slight jiggles in   
      their parents-star's colors (radial velocity) appear in pink, while   
      those detected by slight dips in their parent star's brightness   
      (transit) are shown in purple. Further, those exoplanets imaged   
      directly appear in orange, while those detected by gravitationally   
      magnifying the light of a background star (microlensing) are shown in   
      green. The faster a planet orbits its parent star, the higher the   
      accompanying tone played. The retired Kepler satellite has discovered   
      about half of these first 4000 exoplanets in just one region of the   
      sky, while the TESS mission is on track to find even more, all over the   
      sky, orbiting the brightest nearby stars. Finding exoplanets not only   
      helps humanity to better understand the potential prevalence of life   
      elsewhere in the universe, but also how our Earth and Solar System were   
      formed.   
      
                         Tomorrow's picture: wall of stars   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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