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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.   
      
                                  2023 October 17   
         An orange elliptical ring is shown that is a disk of gas and dust   
       around the star PDS 70. In the center of the disk is a fuzzy spot and   
      near the inner right edge of the disk is another fuzzy spot. Please see   
                  the explanation for more detailed information.   
      
                         PDS 70: Disk, Planets, and Moons   
               Image Credit: ALMA (ESO/NAOJ/NRAO); M. Benisty et al.   
      
      Explanation: It's not the big ring that's attracting the most   
      attention. Although the big planet-forming ring around the star PDS 70   
      is clearly imaged and itself quite interesting. It's also not the   
      planet on the right, just inside the big disk, thatCÇÖs being talked   
      about the most. Although the planet PDS 70c is a newly formed and,   
      interestingly, similar in size and mass to Jupiter. It's the fuzzy   
      patch around the planet PDS 70c that's causing the commotion. That   
      fuzzy patch is thought to be a dusty disk that is now forming into   
      moons -- and that had never been seen before. The featured image was   
      taken in 2021 by the Atacama Large Millimeter Array (ALMA) of 66 radio   
      telescopes in the high Atacama Desert of northern Chile. Based on ALMA   
      data, astronomers infer that the moon-forming exoplanetary disk has a   
      radius similar to our Earth's orbit, and may one day form three or so   
      Luna-sized moons -- not very different from our Jupiter's four.   
      
                       Tomorrow's picture: veiled supernova   
        __________________________________________________________________   
      
          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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