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.

                               2019 August 24
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                     Millions of Stars in Omega Centauri
       Image Credit & [3]Copyright: [4]Michael Miller, [5]Jimmy Walker

   Explanation: Globular star cluster [6]Omega Centauri, also known as NGC
   5139, is some 15,000 light-years away. The cluster is [7]packed with
   about 10 million stars much older than the Sun within a volume about
   150 light-years in diameter. It's the largest and brightest of 200 or
   so known [8]globular clusters that roam the halo of our Milky Way
   galaxy. Though most star clusters consist of stars with the same age
   and composition, the enigmatic Omega Cen exhibits the presence of
   [9]different stellar populations with a spread of ages and chemical
   abundances. In fact, [10]Omega Cen may be the remnant core of a small
   galaxy merging with the Milky Way.

                      Tomorrow's picture: Leaving Earth
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    Authors & editors: [22]Robert Nemiroff ([23]MTU) & [24]Jerry Bonnell
                                 ([25]UMCP)
          NASA Official: Phillip Newman [26]Specific rights apply.
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                A service of: [28]ASD at [29]NASA / [30]GSFC
                           & [31]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1908/OmegaCentauriMillerWalker2048.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. http://www.remarkableheavens.com/
   5. http://jwalk.smugmug.com/
   6. http://earthsky.org/clusters-nebulae-galaxies/omega-centauri-milky-ways-prize-star-cluster
   7. https://apod.nasa.gov/apod/ap080906.html
   8. http://en.wikipedia.org/wiki/Globular_clusters
   9. http://arxiv.org/abs/0912.4176
  10. http://www.spacetelescope.org/news/html/heic0809.html
  11. https://apod.nasa.gov/apod/ap190823.html
  12. https://apod.nasa.gov/apod/archivepix.html
  13. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  14. https://apod.nasa.gov/apod/lib/aptree.html
  15. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  16. https://apod.nasa.gov/apod/calendar/allyears.html
  17. https://apod.nasa.gov/apod.rss
  18. https://apod.nasa.gov/apod/lib/edlinks.html
  19. https://apod.nasa.gov/apod/lib/about_apod.html
  20. http://asterisk.apod.com/discuss_apod.php?date=190824
  21. https://apod.nasa.gov/apod/ap190825.html
  22. http://www.phy.mtu.edu/faculty/Nemiroff.html
  23. http://www.phy.mtu.edu/
  24. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  25. http://www.astro.umd.edu/
  26. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  27. https://www.nasa.gov/about/highlights/HP_Privacy.html
  28. https://astrophysics.gsfc.nasa.gov/
  29. https://www.nasa.gov/
  30. https://www.nasa.gov/centers/goddard/
  31. http://www.mtu.edu/