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                        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 March 1
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                     The Pelican Nebula in Red and Blue
     Image Credit & [3]Copyright: M. Petrasko, M. Evenden, [4]U. Mishra
                              ([5]Insight Obs.)

   Explanation: The Pelican Nebula is changing. The entire nebula,
   officially designated IC 5070, is divided from the larger [6]North
   America Nebula by a [7]molecular cloud filled with dark [8]dust. The
   [9]Pelican, however, is particularly interesting because it is an
   unusually active mix of [10]star formation and evolving gas clouds. The
   [11]featured picture was processed to bring out two main colors, red
   and blue, with the red dominated by light emitted by interstellar
   [12]hydrogen. [13]Ultraviolet light emitted by young energetic stars is
   slowly transforming cold gas in the nebula to hot gas, with the
   [14]advancing boundary between the two, known as an [15]ionization
   front, visible in bright red across the image center. Particularly
   dense [16]tentacles of cold gas remain. Millions of years from now this
   nebula might no longer be known as the [17]Pelican, as the [18]balance
   and placement of stars and gas will surely leave something that
   [19]appears completely different.

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                     Tomorrow's picture: more from mars
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    Authors & editors: [55]Robert Nemiroff ([56]MTU) & [57]Jerry Bonnell
                                 ([58]UMCP)
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References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2102/Pelican_PetraskoEtAl_3555.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.instagram.com/mr_deepsky/
   5. https://www.insightobservatory.com/p/home-page.html
   6. https://apod.nasa.gov/apod/ap000501.html
   7. https://apod.nasa.gov/apod/ap201122.html
   8. http://curator.jsc.nasa.gov/stardust/interstellardust.cfm
   9. https://www.youtube.com/watch?v=m1jUJQyzv8M
  10. https://apod.nasa.gov/apod/ap120722.html
  11. https://www.astrobin.com/fxphu9/
  12. https://en.wikipedia.org/wiki/Hydrogen
  13. https://science.nasa.gov/ems/10_ultravioletwaves
  14. https://apod.nasa.gov/apod/ap180205.html
  15. https://apod.nasa.gov/apod/ap031013.html
  16. https://en.wikipedia.org/wiki/Tentacle#/media/File:Snail-front-0A.jpg
  17. http://apod.nasa.gov/cgi-bin/apod/apod_search?tquery=Pelican
  18. https://ui.adsabs.harvard.edu/abs/1980ApJ...239..121B/abstract
  19. https://www.barkbusters.co.uk/images/articles/7a4120f095480e9f2a2ad2a165d90313.jpg
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  50. https://apod.nasa.gov/apod.rss
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  55. http://www.phy.mtu.edu/faculty/Nemiroff.html
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  57. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
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