Astronomy Picture of the Day

   [1]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
    [2]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: [3]NASA, [4]ESA, [5]CSA, [6]Webb; Processing: [7]Tom Ray
                              ([8]DIAS Dublin)

   Explanation: Do [9]stars always create jets as they form? No one is
   sure. As a gas cloud [10]gravitationally contracts, it forms a [11]disk
   that can spin too fast to continue contracting into a [12]protostar.
   Theorists [13]hypothesize that this spin can be reduced by expelling
   jets. This speculation coincides with known [14]Herbig-Haro (HH)
   objects, young stellar objects seen to emit jets -- sometimes in
   [15]spectacular fashion. [16]Pictured is Herbig-Haro 211, a young star
   in formation [17]recently imaged by the [18]Webb Space Telescope (JWST)
   in [19]infrared light and in [20]great detail. Along with the [21]two
   narrow beams of particles, red [22]shock waves can be seen as the
   outflows impact [23]existing interstellar gas. The jets of [24]HH 221
   will likely change shape as they brighten and fade over the next
   100,000 years, as research into the details of [25]star formation
   continues.

                 Tomorrow's picture: another star's planets
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    Authors & editors: [37]Robert Nemiroff ([38]MTU) & [39]Jerry Bonnell
                                 ([40]UMCP)
          NASA Official: Phillip Newman [41]Specific rights apply.
              [42]NASA Web Privacy Policy and Important Notices
                A service of: [43]ASD at [44]NASA / [45]GSFC,
                         [46]NASA Science Activation
                           & [47]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2309/HH211_webb_3846.jpg
   3. https://www.nasa.gov/
   4. https://www.esa.int/
   5. https://www.asc-csa.gc.ca/eng/
   6. https://webb.nasa.gov/
   7. https://www.dias.ie/2019/12/06/professor-tom-ray/
   8. https://www.dias.ie/
   9. https://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve
  10. https://en.wikipedia.org/wiki/Star_formation#Cloud_collapse
  11. https://apod.nasa.gov/apod/ap991219.html
  12. https://en.wikipedia.org/wiki/Protostar
  13. https://ui.adsabs.harvard.edu/abs/2016ApJ...816...32J/abstract
  14. https://en.wikipedia.org/wiki/Herbig–Haro_object
  15. https://apod.nasa.gov/apod/ap180311.html
  16. https://webbtelescope.org/contents/media/images/2023/141/01H9NWH9JEBFPKVD3M1RRTGGQJ
  17. https://webbtelescope.org/contents/news-releases/2023/news-2023-141
  18. https://webbtelescope.org/
  19. https://science.nasa.gov/ems/07_infraredwaves
  20. https://i0.hippopx.com/photos/807/839/788/cat-pet-cat-cat-maine-coon-cat-preview.jpg
  21. https://apod.nasa.gov/apod/ap200525.html
  22. https://apod.nasa.gov/apod/ap200202.html
  23. https://apod.nasa.gov/apod/ap100829.html
  24. https://iaaa.org/herbig-haro-hh-211/
  25. https://hubblesite.org/science/stars-and-nebulas
  26. https://apod.nasa.gov/apod/ap230918.html
  27. https://apod.nasa.gov/apod/archivepix.html
  28. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  29. https://apod.nasa.gov/apod/lib/aptree.html
  30. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  31. https://apod.nasa.gov/apod/calendar/allyears.html
  32. https://apod.nasa.gov/apod.rss
  33. https://apod.nasa.gov/apod/lib/edlinks.html
  34. https://apod.nasa.gov/apod/lib/about_apod.html
  35. https://asterisk.apod.com/discuss_apod.php?date=230919
  36. https://apod.nasa.gov/apod/ap230920.html
  37. http://www.phy.mtu.edu/faculty/Nemiroff.html
  38. http://www.phy.mtu.edu/
  39. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  40. http://www.astro.umd.edu/
  41. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  42. https://www.nasa.gov/about/highlights/HP_Privacy.html
  43. https://astrophysics.gsfc.nasa.gov/
  44. https://www.nasa.gov/
  45. https://www.nasa.gov/centers/goddard/
  46. https://science.nasa.gov/learners
  47. http://www.mtu.edu/