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.

                                 2022 May 17
   [2]The featured image shows a deep image of the giant elliptical galaxy
   NGC 1316 featuring many concentric shells which embed a smaller galaxy.
          Please see the explanation for more detailed information.

                      NGC 1316: After Galaxies Collide
   Image Credit & Copyright: Capture: [3]Greg Turgeon; Processing: [4]Kiko
                                  Fairbairn

   Explanation: Astronomers turn detectives when trying to figure out the
   cause of startling sights like [5]NGC 1316. Investigations indicate
   that [6]NGC 1316 is an enormous [7]elliptical galaxy that started,
   about 100 million years ago, to devour a smaller [8]spiral galaxy
   neighbor, [9]NGC 1317, just on the upper right. Supporting evidence
   includes the dark [10]dust lanes characteristic of a [11]spiral galaxy,
   and faint swirls and shells of stars and gas visible in this wide and
   deep image. One thing that [12]>remains unexplained is the unusually
   small [13]globular star clusters, seen as faint dots on the image. Most
   [14]elliptical galaxies have [15]more and brighter globular clusters
   than [16]NGC 1316. Yet the observed [17]globulars are too old to have
   been created by the recent [18]spiral collision. One hypothesis is that
   these [19]globulars survive from an even earlier [20]galaxy that was
   subsumed into [21]NGC 1316. Another surprising attribute of [22]NGC
   1316, also known as Fornax A, is its [23]giant lobes of gas that glow
   brightly in [24]radio waves.

                       Tomorrow's picture: open space
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    Authors & editors: [36]Robert Nemiroff ([37]MTU) & [38]Jerry Bonnell
                                 ([39]UMCP)
          NASA Official: Phillip Newman [40]Specific rights apply.
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                A service of: [42]ASD at [43]NASA / [44]GSFC
                           & [45]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2205/Ngc1316_Turgeon_1300.jpg
   3. https://www.instagram.com/gregturgeon_astro/
   4. https://www.instagram.com/kikofairbairn/
   5. https://hubblesite.org/contents/media/images/2005/11/1671-Image.html
   6. https://www.eso.org/public/images/eso0024a/
   7. https://apod.nasa.gov/apod/ap120914.html
   8. https://en.wikipedia.org/wiki/Spiral_galaxy
   9. https://en.wikipedia.org/wiki/NGC_1317
  10. https://apod.nasa.gov/apod/ap980116.html
  11. http://apod.nasa.gov/apod/spiral_galaxies.html
  12. https://media.istockphoto.com/photos/lovely-puppy-portrait-picture-id92359506?k=20&m=92359506&s=612x612&w=0&h=tZkP0X2qQ-dyjj4hj_5K4RSdNoqRNMt1U_fFgsTTXvU=
  13. https://apod.nasa.gov/apod/ap190324.html
  14. https://en.wikipedia.org/wiki/Elliptical_galaxy
  15. https://ui.adsabs.harvard.edu/abs/1998MNRAS.298.1123K/abstract
  16. https://ui.adsabs.harvard.edu/abs/1996AJ....111.2212S/abstract
  17. https://apod.nasa.gov/apod/ap150620.html
  18. https://apod.nasa.gov/apod/ap130514.html
  19. https://en.wikipedia.org/wiki/Globular_cluster
  20. https://spaceplace.nasa.gov/galaxy/en/
  21. https://en.wikipedia.org/wiki/NGC_1316
  22. https://www.youtube.com/watch?v=_nBm9M8LMZg
  23. https://apod.nasa.gov/apod/ap050628.html
  24. https://science.nasa.gov/ems/05_radiowaves
  25. https://apod.nasa.gov/apod/ap220516.html
  26. https://apod.nasa.gov/apod/archivepix.html
  27. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  28. https://apod.nasa.gov/apod/lib/aptree.html
  29. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  30. https://apod.nasa.gov/apod/calendar/allyears.html
  31. https://apod.nasa.gov/apod.rss
  32. https://apod.nasa.gov/apod/lib/edlinks.html
  33. https://apod.nasa.gov/apod/lib/about_apod.html
  34. http://asterisk.apod.com/discuss_apod.php?date=220517
  35. https://apod.nasa.gov/apod/ap220518.html
  36. http://www.phy.mtu.edu/faculty/Nemiroff.html
  37. http://www.phy.mtu.edu/
  38. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  39. http://www.astro.umd.edu/
  40. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  41. https://www.nasa.gov/about/highlights/HP_Privacy.html
  42. https://astrophysics.gsfc.nasa.gov/
  43. https://www.nasa.gov/
  44. https://www.nasa.gov/centers/goddard/
  45. http://www.mtu.edu/