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.

                               2023 January 4
   [2]The featured image shows a distant galaxy on the left next to a gas
   cloud on the right. An opening in the gas cloud is on the same side as
    the galaxy. Please see the explanation for more detailed information.

                       CG4: The Globule and the Galaxy
         Image Credit & [3]Copyright: [4]Mike Selby & [5]Mark Hanson

   Explanation: Can a gas cloud eat a galaxy? It's not even close. The
   "claw" of this odd looking "creature" in the [6]featured photo is a gas
   cloud known as a [7]cometary globule. This globule, however, [8]has
   ruptured. Cometary [9]globules are typically characterized by [10]dusty
   heads and elongated [11]tails. These features cause cometary
   [12]globules to have visual similarities to [13]comets, but in reality
   they are very much different. [14]Globules are frequently the
   birthplaces of stars, and many show very young [15]stars in their
   heads. The reason for the rupture in the head of this object is not yet
   known. The [16]galaxy to the left of the globule is huge, very far in
   the distance, and only placed near [17]CG4 by [18]chance superposition.

    Discovery + Outreach: [19]Graduate student research position open for
                                    APOD
                       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/2301/cg4_selby_5430.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.facebook.com/masterdarksastro/
   5. https://www.hansonastronomy.com/
   6. https://www.facebook.com/photo/?fbid=512470817529735
   7. https://en.wikipedia.org/wiki/cometary_globule
   8. https://ui.adsabs.harvard.edu/abs/1995A%26A...293..493G/abstract
   9. https://apod.nasa.gov/apod/ap020325.html
  10. https://apod.nasa.gov/apod/lib/glossary.html#dust
  11. https://ui.adsabs.harvard.edu/abs/1996ApJ...463L.105M/abstract
  12. https://apod.nasa.gov/apod/ap140414.html
  13. https://apod.nasa.gov/apod/ap170409.html
  14. https://en.wikipedia.org/wiki/Dark_nebula
  15. https://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve
  16. http://en.wikipedia.org/wiki/Galaxy
  17. https://en.wikipedia.org/wiki/CG_4
  18. https://blogmais.files.wordpress.com/2008/04/imagem_ht_07-04-23.jpg
  19. http://asterisk.apod.com/viewtopic.php?t=42847
  20. https://apod.nasa.gov/apod/ap230103.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=230104
  30. https://apod.nasa.gov/apod/ap230105.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/