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.

                                2021 July 29
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                          The Tulip and Cygnus X-1
               Image Credit & [3]Copyright: [4]Carlos Uriarte

   Explanation: [5]This tall telescopic field of view looks out along the
   plane of our Milky Way Galaxy toward the nebula rich constellation
   [6]Cygnus the Swan. Popularly called the Tulip Nebula, the brightest
   glowing cloud of interstellar gas and dust above center is also found
   in the [7]1959 catalog by astronomer Stewart Sharpless [8]as Sh2-101.
   Nearly 70 light-years across the complex and beautiful Tulip Nebula
   blossoms about 8,000 light-years away, shown in a Hubble palette image
   that maps the glow of the nebula's sulfur, hydrogen, and oxygen ions
   into red, green, and blue colors. Ultraviolet radiation from young
   energetic stars at the edge of the Cygnus [9]OB3 association, including
   [10]O star HDE 227018, [11]ionizes the atoms and powers the emission
   from the Tulip Nebula. Also in the field of view is microquasar
   [12]Cygnus X-1, one of the strongest X-ray sources in planet Earth's
   sky. Driven by powerful jets from a black hole accretion disk, its
   fainter bluish curved shock front is only just visible though, directly
   [13]above the cosmic Tulip's petals near the top of the frame.

                       Tomorrow's picture: Saturnshine
     __________________________________________________________________

      [14]< | [15]Archive | [16]Submissions | [17]Index | [18]Search |
   [19]Calendar | [20]RSS | [21]Education | [22]About APOD | [23]Discuss |
                                    [24]>
     __________________________________________________________________

    Authors & editors: [25]Robert Nemiroff ([26]MTU) & [27]Jerry Bonnell
                                 ([28]UMCP)
          NASA Official: Phillip Newman [29]Specific rights apply.
              [30]NASA Web Privacy Policy and Important Notices
                A service of: [31]ASD at [32]NASA / [33]GSFC
                           & [34]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2107/sh2_101_04.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.flickr.com/people/187879001@N05/
   5. https://www.flickr.com/photos/187879001@N05/51319579978/in/photostream/
   6. http://en.wikipedia.org/wiki/Cygnus_(constellation)
   7. http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1959ApJS....4..257S
   8. http://galaxymap.org/cat/list/sharpless/101
   9. http://en.wikipedia.org/wiki/Stellar_kinematics#OB_associations
  10. https://apod.nasa.gov/apod/ap070726.html
  11. https://apod.nasa.gov/apod/ap111103.html
  12. http://chandra.harvard.edu/photo/2011/cygx1/
  13. https://apod.nasa.gov/apod/ap090608.html
  14. https://apod.nasa.gov/apod/ap210728.html
  15. https://apod.nasa.gov/apod/archivepix.html
  16. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  17. https://apod.nasa.gov/apod/lib/aptree.html
  18. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  19. https://apod.nasa.gov/apod/calendar/allyears.html
  20. https://apod.nasa.gov/apod.rss
  21. https://apod.nasa.gov/apod/lib/edlinks.html
  22. https://apod.nasa.gov/apod/lib/about_apod.html
  23. http://asterisk.apod.com/discuss_apod.php?date=210729
  24. https://apod.nasa.gov/apod/ap210730.html
  25. http://www.phy.mtu.edu/faculty/Nemiroff.html
  26. http://www.phy.mtu.edu/
  27. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  28. http://www.astro.umd.edu/
  29. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  30. https://www.nasa.gov/about/highlights/HP_Privacy.html
  31. https://astrophysics.gsfc.nasa.gov/
  32. https://www.nasa.gov/
  33. https://www.nasa.gov/centers/goddard/
  34. http://www.mtu.edu/