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 December 8
   [2]The featured image shows Comet Hale-Bopp over the Dolomite mountains
     as it appeared in 1997 Please see the explanation for more detailed
                                information.

                    Comet Hale-Bopp Over Val Parola Pass
      Image Credit & Copyright: A. Dimai, ([3]Col Druscie Obs.), [4]AAC

   Explanation: [5]Comet Hale-Bopp, the Great Comet of 1997, became much
   brighter than any surrounding stars. It was seen even over [6]bright
   city lights. Away from city lights, however, it put on quite a
   [7]spectacular show. Here Comet Hale-Bopp was photographed above [8]Val
   Parola Pass in the [9]Dolomite [10]mountains surrounding [11]Cortina
   d'Ampezzo, [12]Italy. [13]Comet Hale-Bopp's blue [14]ion tail,
   consisting of [15]ions from the [16]comet's nucleus, is pushed out by
   the [17]solar wind. The white [18]dust tail is composed of larger
   particles of [19]dust from the nucleus driven by the pressure of
   sunlight, that orbit behind the [20]comet. Comet Hale-Bopp (C/1995 O1)
   remained [21]visible to the unaided eye for 18 months -- [22]longer
   than any other [23]comet in recorded history. The [24]large comet is
   next expected to return around the [25]year 4385. This month, [26]Comet
   Leonard is [27]brightening and may soon become visible to the unaided
   eye.

                       Tomorrow's picture: open space
     __________________________________________________________________

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    Authors & editors: [39]Robert Nemiroff ([40]MTU) & [41]Jerry Bonnell
                                 ([42]UMCP)
          NASA Official: Phillip Newman [43]Specific rights apply.
              [44]NASA Web Privacy Policy and Important Notices
                A service of: [45]ASD at [46]NASA / [47]GSFC
                           & [48]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2112/halebopp_dimai_960.jpg
   3. https://www.cortinastelle.it/joomla30/index.php/it/osservatorio/osservatorio-del-col-druscie
   4. https://www.cortinastelle.it/joomla30/index.php/it/
   5. http://www2.jpl.nasa.gov/comet/
   6. https://apod.nasa.gov/apod/ap970408.html
   7. https://apod.nasa.gov/apod/ap970313.html
   8. https://youtu.be/VkpNkoC4hz4
   9. https://youtu.be/Dm7O9FnvsuE?t=17
  10. https://en.wikipedia.org/wiki/Dolomites
  11. https://en.wikipedia.org/wiki/Cortina_d%27Ampezzo
  12. https://en.wikipedia.org/wiki/Italy
  13. https://en.wikipedia.org/wiki/Comet_hale_bopp
  14. http://www2.ess.ucla.edu/~jewitt/tail.html
  15. https://en.wikipedia.org/wiki/Ion
  16. https://apod.nasa.gov/apod/ap100104.html
  17. https://apod.nasa.gov/apod/ap000318.html
  18. https://apod.nasa.gov/apod/ap001227.html
  19. https://apod.nasa.gov/apod/ap011117.html
  20. https://solarsystem.nasa.gov/asteroids-comets-and-meteors/comets/overview/
  21. https://apod.nasa.gov/cgi-bin/apod/apod_search?tquery=Bopp
  22. https://i.kym-cdn.com/photos/images/newsfeed/000/002/110/longcat.jpg?1241726484
  23. https://solarsystem.nasa.gov/asteroids-comets-and-meteors/comets/c-1995-o1-hale-bopp/in-depth/
  24. https://apod.nasa.gov/apod/ap970414.html
  25. https://en.wikipedia.org/wiki/5th_millennium
  26. https://en.wikipedia.org/wiki/C/2021_A1_(Leonard)
  27. http://www.aerith.net/comet/catalog/2021A1/mag2.gif
  28. https://apod.nasa.gov/apod/ap211207.html
  29. https://apod.nasa.gov/apod/archivepix.html
  30. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  31. https://apod.nasa.gov/apod/lib/aptree.html
  32. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  33. https://apod.nasa.gov/apod/calendar/allyears.html
  34. https://apod.nasa.gov/apod.rss
  35. https://apod.nasa.gov/apod/lib/edlinks.html
  36. https://apod.nasa.gov/apod/lib/about_apod.html
  37. http://asterisk.apod.com/discuss_apod.php?date=211208
  38. https://apod.nasa.gov/apod/ap211209.html
  39. http://www.phy.mtu.edu/faculty/Nemiroff.html
  40. http://www.phy.mtu.edu/
  41. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  42. http://www.astro.umd.edu/
  43. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  44. https://www.nasa.gov/about/highlights/HP_Privacy.html
  45. https://astrophysics.gsfc.nasa.gov/
  46. https://www.nasa.gov/
  47. https://www.nasa.gov/centers/goddard/
  48. http://www.mtu.edu/