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                        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 August 30
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                    NGC 6357: Cathedral to Massive Stars
   Image Credit: [3]NASA, [4]ESA and Jesús Maíz Apellániz ([5]IAA, Spain);
              Acknowledgement: Davide De Martin ([6]ESA/Hubble)

   Explanation: How massive can a normal star be? Estimates made from
   distance, brightness and standard [7]solar models had given one star in
   the [8]open cluster Pismis 24 over 200 times the mass of our [9]Sun,
   making it one of the most massive stars known. This [10]star is the
   brightest object [11]located just above the gas front in the
   [12]featured image. Close inspection of [13]images taken with the
   [14]Hubble Space Telescope, however, have shown that Pismis 24-1
   derives its brilliant luminosity [15]not from a single star but from
   [16]three at least. [17]Component stars would still remain near 100
   solar masses, making them among the more [18]massive stars currently on
   record. Toward the bottom of the image, [19]stars are still forming in
   the associated [20]emission nebula [21]NGC 6357. Appearing perhaps like
   a [22]Gothic cathedral, energetic stars near the center appear to be
   [23]breaking out and illuminating a [24]spectacular cocoon.

     Teachers & Students: [25]Ideas for Utilizing APOD in the Classroom
                  Tomorrow's picture: micro-quasar imagined
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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]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2008/ngc6357_hubble_3140.jpg
   3. https://www.nasa.gov/
   4. https://www.esa.int/
   5. https://www.iaa.es/
   6. https://www.spacetelescope.org/
   7. http://spiff.rit.edu/classes/phys230/lectures/star_age/star_age.html
   8. https://apod.nasa.gov/apod/open_clusters.html
   9. https://www.nasa.gov/sun
  10. https://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve/
  11. https://www.youtube.com/watch?v=iLbY7PYzku8
  12. https://www.spacetelescope.org/news/html/heic0619.html
  13. https://hubblesite.org/newscenter/archive/releases/2006/54/image/
  14. https://apod.nasa.gov/apod/ap010806.html
  15. https://www.spacetelescope.org/news/heic0619/
  16. https://ui.adsabs.harvard.edu/abs/2007ApJ...660.1480M/abstract
  17. https://apod.nasa.gov/apod/ap160205.html
  18. https://en.wikipedia.org/wiki/List_of_most_massive_stars
  19. http://asterisk.apod.com/viewtopic.php?f=24&t=18010
  20. https://apod.nasa.gov/apod/emission_nebulae.html
  21. https://apod.nasa.gov/apod/ap081009.html
  22. http://upload.wikimedia.org/wikipedia/commons/6/65/Catedral_Metropolitana_de_Sao_Paulo_1_Brasil-edit-01.jpg
  23. http://cdn.images.express.co.uk/img/dynamic/1/590x/cat-439127.jpg
  24. https://apod.nasa.gov/apod/ap150517.html
  25. https://apod.nasa.gov/apod/lib/apodclass.html
  26. https://apod.nasa.gov/apod/ap200829.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. http://asterisk.apod.com/discuss_apod.php?date=200830
  36. https://apod.nasa.gov/apod/ap200831.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. http://www.mtu.edu/