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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 September 19   
        Two jets are seen in red and blue moving out from a central object   
       shroueded by a diffuse dark brown. The rest of the frame is dark but   
      with an few bright stars. Please see the explanation for more detailed   
                                   information.   
      
                         HH 211: Jets from a Forming Star   
          Credit: NASA, ESA, CSA, Webb; Processing: Tom Ray (DIAS Dublin)   
      
      Explanation: Do stars always create jets as they form? No one is sure.   
      As a gas cloud gravitationally contracts, it forms a disk that can spin   
      too fast to continue contracting into a protostar. Theorists   
      hypothesize that this spin can be reduced by expelling jets. This   
      speculation coincides with known Herbig-Haro (HH) objects, young   
      stellar objects seen to emit jets -- sometimes in spectacular fashion.   
      Pictured is Herbig-Haro 211, a young star in formation recently imaged   
      by the Webb Space Telescope (JWST) in infrared light and in great   
      detail. Along with the two narrow beams of particles, red shock waves   
      can be seen as the outflows impact existing interstellar gas. The jets   
      of HH 221 will likely change shape as they brighten and fade over the   
      next 100,000 years, as research into the details of star formation   
      continues.   
      
                    Tomorrow's picture: another star's planets   
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          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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