﻿ 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 __________________________________________________________________ [26]< | [27]Archive | [28]Submissions | [29]Index | [30]Search | [31]Calendar | [32]RSS | [33]Education | [34]About APOD | [35]Discuss | [36]> __________________________________________________________________ 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/