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 September 21
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                            The Tulip in the Swan
                 Image Credit & [3]Copyright: [4]Robert Eder

   Explanation: Framing a bright emission region, [5]this telescopic view
   looks out across a pretty field of stars along the plane of our Milky
   Way Galaxy, toward the nebula rich constellation [6]Cygnus the Swan.
   Popularly called the Tulip Nebula, the reddish glowing cloud of
   interstellar gas and dust is also found in the [7]1959 catalog by
   astronomer Stewart Sharpless [8]as Sh2-101. About 8,000 light-years
   distant and 70 light-years across the complex and beautiful nebula
   blossoms near the center of this composite image. Ultraviolet radiation
   from young energetic [9]O stars at the edge of the Cygnus [10]OB3
   association, [11]ionizes the atoms and powers the emission from the
   Tulip Nebula.

                         Tomorrow's picture: eye sky
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    Authors & editors: [23]Robert Nemiroff ([24]MTU) & [25]Jerry Bonnell
                                 ([26]UMCP)
          NASA Official: Phillip Newman [27]Specific rights apply.
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                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/1909/Tulip_CropRobertEder.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://artis-mastering.at/
   5. https://www.astrobin.com/isz2bm/C/?nc=user
   6. http://en.wikipedia.org/wiki/Cygnus_(constellation)
   7. https://ui.adsabs.harvard.edu/abs/1959ApJS....4..257S/abstract
   8. http://galaxymap.org/cgi-bin/sharpless.py?s=101
   9. https://apod.nasa.gov/apod/ap070726.html
  10. http://en.wikipedia.org/wiki/Stellar_kinematics#OB_associations
  11. https://apod.nasa.gov/apod/ap111103.html
  12. https://apod.nasa.gov/apod/ap190920.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=190921
  22. https://apod.nasa.gov/apod/ap190922.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/