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.

                               2020 January 23
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                       Globular Star Cluster NGC 6752
             Image Credit & [3]Copyright: [4]Jose Joaquin Perez

   Explanation: Some 13,000 light-years away toward the southern
   constellation Pavo, the globular star cluster NGC 6752 roams the halo
   of our Milky Way galaxy. Over 10 billion years old, [5]NGC 6752 follows
   clusters [6]Omega Centauri and [7]47 Tucanae as the third brightest
   globular in planet Earth's night sky. It holds over 100 thousand
   [8]stars in a sphere about 100 light-years in diameter. Telescopic
   [9]explorations of the NGC 6752 have found that a remarkable fraction
   of the stars near the cluster's core, are multiple star systems. They
   also reveal the presence of blue straggle stars, stars which appear to
   be too young and massive to exist in a cluster whose stars are all
   expected to be at least twice as old as the Sun. The blue stragglers
   are [10]thought to be formed by star mergers and collisions in the
   dense stellar environment at [11]the cluster's core. This sharp color
   composite also features the cluster's ancient red giant stars in
   yellowish hues. (Note: The bright, spiky blue star at 11 o'clock from
   the cluster center is a foreground star along the line-of-sight to NGC
   6752)

                       Tomorrow's picture: shadow play
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    Authors & editors: [23]Robert Nemiroff ([24]MTU) & [25]Jerry Bonnell
                                 ([26]UMCP)
          NASA Official: Phillip Newman [27]Specific rights apply.
              [28]NASA Web Privacy Policy and Important Notices
                A service of: [29]ASD at [30]NASA / [31]GSFC
                           & [32]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2001/NGC6752LRGBcrop.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. http://www.astro-austral.cl/aboutme.htm
   5. http://spider.seds.org/spider/MWGC/n6752.html
   6. https://apod.nasa.gov/apod/ap190824.html
   7. https://apod.nasa.gov/apod/ap121206.html
   8. http://astroanarchy.blogspot.com/2010/07/ngc-6752-as-stereo-pair-3d.html
   9. http://adsabs.harvard.edu/abs/1997ApJ...474..701R
  10. http://arxiv.org/abs/astro-ph/0409001
  11. https://apod.nasa.gov/apod/ap120210.html
  12. https://apod.nasa.gov/apod/ap200122.html
  13. https://apod.nasa.gov/apod/archivepix.html
  14. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  15. https://apod.nasa.gov/apod/lib/aptree.html
  16. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  17. https://apod.nasa.gov/apod/calendar/allyears.html
  18. https://apod.nasa.gov/apod.rss
  19. https://apod.nasa.gov/apod/lib/edlinks.html
  20. https://apod.nasa.gov/apod/lib/about_apod.html
  21. http://asterisk.apod.com/discuss_apod.php?date=200123
  22. https://apod.nasa.gov/apod/ap200124.html
  23. http://www.phy.mtu.edu/faculty/Nemiroff.html
  24. http://www.phy.mtu.edu/
  25. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  26. http://www.astro.umd.edu/
  27. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  28. https://www.nasa.gov/about/highlights/HP_Privacy.html
  29. https://astrophysics.gsfc.nasa.gov/
  30. https://www.nasa.gov/
  31. https://www.nasa.gov/centers/goddard/
  32. http://www.mtu.edu/