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.

                              2022 November 15
    [2]The featured image shows a long stretch of brown dust ending in a
   blue glow. Along the right a gas filament glows in red. Please see the
                 explanation for more detailed information.

                             Wolf's Cave Nebula
                 Image Credit & Copyright: [3]Gianni Lacroce

   Explanation: [4]The mysterious blue reflection nebula found in catalogs
   as [5]VdB 152 or Ced 201 really is very faint. It lies at the tip of
   the long [6]dark nebula Barnard 175 in a dusty complex that has also
   been called [7]Wolf's Cave. At the center of [8]this deep telescopic
   view, the [9]cosmic apparitions are nearly 1,400 [10]light-years away
   along the northern Milky Way in the [11]royal constellation Cepheus.
   [12]Interstellar dust in the region [13]blocks light from background
   stars and [14]scatters light from the embedded bright star, giving the
   end nebula its characteristic blue color. Though [15]stars do form in
   [16]molecular clouds, this star seems to have only accidentally
   wandered into the area, as its measured velocity through space is very
   different from the cloud's velocity. At [17]the image bottom is the
   planetary nebula [18]Dengel-Hartl 5, while red glowing gas from an
   ancient supernova remnant is [19]also visible along the image's right
   side.

                       Tomorrow's picture: open space
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    Authors & editors: [31]Robert Nemiroff ([32]MTU) & [33]Jerry Bonnell
                                 ([34]UMCP)
          NASA Official: Phillip Newman [35]Specific rights apply.
              [36]NASA Web Privacy Policy and Important Notices
                A service of: [37]ASD at [38]NASA / [39]GSFC,
                         [40]NASA Science Activation
                           & [41]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2211/WolfsCave_Lacroce_3053.jpg
   3. https://www.flickr.com/photos/194921065@N03/
   4. https://ui.adsabs.harvard.edu/abs/1908MNRAS..69..117W/abstract
   5. https://noirlab.edu/public/images/noao-vdb152/
   6. https://apod.nasa.gov/apod/ap090425.html
   7. http://bf-astro.com/vdB152/vdB152.htm
   8. https://www.flickr.com/photos/194921065@N03/52425057847/in/pool-apods/
   9. https://apod.nasa.gov/ap201026.html
  10. https://exoplanets.nasa.gov/faq/26/what-is-a-light-year/
  11. https://earthsky.org/sky-archive/constellation-cepheus-looks-like-a-house
  12. https://curator.jsc.nasa.gov/stardust/interstellardust.cfm
  13. https://apod.nasa.gov/apod/ap201122.html
  14. https://en.wikipedia.org/wiki/Reflection_nebula
  15. https://coolcosmos.ipac.caltech.edu/infrared_gallery/4
  16. https://en.wikipedia.org/wiki/Molecular_cloud
  17. https://www.astrobin.com/bxbmqc/
  18. https://astrodonimaging.com/gallery/dengel-hartl-5-in-cepheus/
  19. http://bf-astro.com/vdB152/vdB152.htm
  20. https://apod.nasa.gov/apod/ap221114.html
  21. https://apod.nasa.gov/apod/archivepix.html
  22. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  23. https://apod.nasa.gov/apod/lib/aptree.html
  24. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  25. https://apod.nasa.gov/apod/calendar/allyears.html
  26. https://apod.nasa.gov/apod.rss
  27. https://apod.nasa.gov/apod/lib/edlinks.html
  28. https://apod.nasa.gov/apod/lib/about_apod.html
  29. http://asterisk.apod.com/discuss_apod.php?date=221115
  30. https://apod.nasa.gov/apod/ap221116.html
  31. http://www.phy.mtu.edu/faculty/Nemiroff.html
  32. http://www.phy.mtu.edu/
  33. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  34. http://www.astro.umd.edu/
  35. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  36. https://www.nasa.gov/about/highlights/HP_Privacy.html
  37. https://astrophysics.gsfc.nasa.gov/
  38. https://www.nasa.gov/
  39. https://www.nasa.gov/centers/goddard/
  40. https://science.nasa.gov/learners
  41. http://www.mtu.edu/