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 November 25
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                          NGC 6995: The Bat Nebula
                  Image Credit & Copyright: [3]Josep Drudis

   Explanation: Do you see the bat? It haunts [4]this cosmic close-up of
   the eastern [5]Veil Nebula. [6]The Veil Nebula itself is a large
   supernova remnant, the expanding debris cloud from the [7]death
   explosion of a massive star. While the Veil is roughly [8]circular in
   shape and covers nearly 3 degrees on the sky toward the constellation
   of the Swan ([9]Cygnus), the Bat Nebula, NGC 6995, spans only 1/2
   degree, about the apparent size [10]of the Moon. That [11]translates to
   12 light-years at the Veil's estimated distance, a reassuring 1,400
   light-years from [12]planet Earth. In the composite of image data
   recorded through broad and [13]narrow band filters, emission from
   [14]hydrogen atoms in the remnant is shown in red with strong emission
   from oxygen and nitrogen atoms shown in hues of blue. Of course, in the
   western part of the Veil lies another seasonal apparition: [15]the
   Witch's Broom Nebula.

                    Tomorrow's picture: galaxy-sized ring
     __________________________________________________________________

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    Authors & editors: [27]Robert Nemiroff ([28]MTU) & [29]Jerry Bonnell
                                 ([30]UMCP)
          NASA Official: Phillip Newman [31]Specific rights apply.
              [32]NASA Web Privacy Policy and Important Notices
                A service of: [33]ASD at [34]NASA / [35]GSFC
                           & [36]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1911/NGC6995_Drudis_3942.jpg
   3. http://www.astrodrudis.com/
   4. https://astrodrudis.com/ngc-6995-the-bat-nebula/
   5. https://en.wikipedia.org/wiki/Veil_Nebula
   6. https://apod.nasa.gov/apod/ap191031.html
   7. https://www.youtube.com/watch?v=OyntBsxoEkA
   8. https://www.mathsisfun.com/algebra/trig-interactive-unit-circle.html
   9. https://en.wikipedia.org/wiki/Cygnus_(constellation)
  10. https://apod.nasa.gov/apod/ap130801.html
  11. http://chandra.harvard.edu/photo/scale_distance.html
  12. https://www.globe.gov/en
  13. https://apod.nasa.gov/apod/ap071102.html
  14. https://periodic.lanl.gov/1.shtml
  15. https://apod.nasa.gov/apod/ap180408.html
  16. https://apod.nasa.gov/apod/ap191124.html
  17. https://apod.nasa.gov/apod/archivepix.html
  18. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  19. https://apod.nasa.gov/apod/lib/aptree.html
  20. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  21. https://apod.nasa.gov/apod/calendar/allyears.html
  22. https://apod.nasa.gov/apod.rss
  23. https://apod.nasa.gov/apod/lib/edlinks.html
  24. https://apod.nasa.gov/apod/lib/about_apod.html
  25. http://asterisk.apod.com/discuss_apod.php?date=191125
  26. https://apod.nasa.gov/apod/ap191126.html
  27. http://www.phy.mtu.edu/faculty/Nemiroff.html
  28. http://www.phy.mtu.edu/
  29. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  30. http://www.astro.umd.edu/
  31. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  32. https://www.nasa.gov/about/highlights/HP_Privacy.html
  33. https://astrophysics.gsfc.nasa.gov/
  34. https://www.nasa.gov/
  35. https://www.nasa.gov/centers/goddard/
  36. http://www.mtu.edu/