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 February 16
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                  NGC 2392: Double-Shelled Planetary Nebula
     Image Credit: [3]NASA, [4]ESA, [5]Hubble, [6]Chandra; Processing &
                         [7]License: [8]Judy Schmidt

   Explanation: To some, this huge nebula resembles a person's head
   surrounded by a [9]parka hood. In 1787, astronomer [10]William Herschel
   discovered this unusual planetary nebula: [11]NGC 2392. More recently,
   the [12]Hubble Space Telescope imaged the nebula in [13]visible light,
   while the nebula was also [14]imaged in X-rays by the [15]Chandra X-ray
   Observatory. The [16]featured combined visible-X ray image, shows
   [17]X-rays emitted by [18]central hot gas in pink. The [19]nebula
   displays gas clouds so complex they are [20]not fully understood.
   [21]NGC 2392 is a double-shelled [22]planetary nebula, with the more
   distant gas having composed the outer layers of a [23]Sun-like star
   only 10,000 years ago. The outer shell contains unusual [24]light-year
   long orange filaments. The inner filaments visible are being ejected by
   strong [25]wind of particles from the central star. The [26]NGC 2392
   Nebula spans about 1/3 of a light year and lies in our [27]Milky Way
   Galaxy, about 3,000 light years distant, toward the constellation of
   the Twins ([28]Gemini).

                       Tomorrow's picture: fade to red
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    Authors & editors: [40]Robert Nemiroff ([41]MTU) & [42]Jerry Bonnell
                                 ([43]UMCP)
          NASA Official: Phillip Newman [44]Specific rights apply.
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                A service of: [46]ASD at [47]NASA / [48]GSFC
                           & [49]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2002/NGC2392_HubbleSchmidt_960.jpg
   3. https://www.nasa.gov/
   4. http://www.esa.int/
   5. https://www.nasa.gov/mission_pages/hubble/main/index.html
   6. https://chandra.harvard.edu/about/
   7. https://creativecommons.org/licenses/by/2.0/
   8. http://geckzilla.com/
   9. https://en.wikipedia.org/wiki/Fur_clothing#/media/File:Sherbrooke,_Canada_(Unsplash_S2sWHoVZF8s)_(cut).jpg
  10. https://en.wikipedia.org/wiki/William_Herschel
  11. https://en.wikipedia.org/wiki/NGC_2392
  12. https://apod.nasa.gov/apod/ap021124.html
  13. https://science.nasa.gov/ems/09_visiblelight
  14. http://chandra.harvard.edu/photo/2013/ngc2392/ngc2392_xray.jpg
  15. https://chandra.harvard.edu/about/
  16. https://www.flickr.com/photos/geckzilla/10347024995
  17. https://science.nasa.gov/ems/11_xrays
  18. http://chandra.harvard.edu/photo/2013/ngc2392/
  19. http://www.youtube.com/watch?v=Uxht89xv4-o
  20. https://ui.adsabs.harvard.edu/abs/2005A&A...430L..69G/abstract
  21. https://ui.adsabs.harvard.edu/abs/1990ApJ...362..226O/abstract
  22. http://antwrp.gsfc.nasa.gov/apod/planetary_nebulae.html
  23. https://apod.nasa.gov/apod/sun.html
  24. http://chandra.harvard.edu/photo/cosmic_distance.html
  25. http://www-istp.gsfc.nasa.gov/Education/wsolwind.html
  26. https://en.wikipedia.org/wiki/NGC_2392
  27. https://apod.nasa.gov/apod/ap090219.html
  28. https://en.wikipedia.org/wiki/Gemini_(constellation)
  29. https://apod.nasa.gov/apod/ap200215.html
  30. https://apod.nasa.gov/apod/archivepix.html
  31. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  32. https://apod.nasa.gov/apod/lib/aptree.html
  33. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  34. https://apod.nasa.gov/apod/calendar/allyears.html
  35. https://apod.nasa.gov/apod.rss
  36. https://apod.nasa.gov/apod/lib/edlinks.html
  37. https://apod.nasa.gov/apod/lib/about_apod.html
  38. http://asterisk.apod.com/discuss_apod.php?date=200216
  39. https://apod.nasa.gov/apod/ap200217.html
  40. http://www.phy.mtu.edu/faculty/Nemiroff.html
  41. http://www.phy.mtu.edu/
  42. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  43. http://www.astro.umd.edu/
  44. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  45. https://www.nasa.gov/about/highlights/HP_Privacy.html
  46. https://astrophysics.gsfc.nasa.gov/
  47. https://www.nasa.gov/
  48. https://www.nasa.gov/centers/goddard/
  49. http://www.mtu.edu/