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.

                              2019 November 20
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                   Arp 273: Battling Galaxies from Hubble
      Image Credit: [3]NASA, [4]ESA, [5]Hubble; Processing & Copyright:
                                [6]Rudy Pohl

   Explanation: What's happening to these spiral galaxies? Although
   details remain [7]uncertain, there sure seems to be a titanic battle
   going on. The [8]upper galaxy is labelled UGC 1810 by itself, but
   together with its [9]collisional partners is known as [10]Arp 273. The
   overall shape of the UGC 1810 -- in particular its [11]blue outer ring
   -- is likely a result of wild and [12]violent [13]gravitational
   [14]interactions. The blue color of the outer ring at the top is caused
   by massive stars that are [15]blue hot and have formed only in the past
   few million years. The inner part of the upper galaxy -- itself an
   older spiral galaxy -- appears redder and threaded with cool
   [16]filamentary dust. A few bright [17]stars appear well in the
   foreground, unrelated to colliding galaxies, while several far-distant
   galaxies are visible in the background. [18]Arp 273 lies about 300
   million light years away [19]toward the constellation of Andromeda.
   Quite likely, UGC 1810 will [20]devour its [21]galactic sidekicks over
   the next billion years and settle into a classic [22]spiral form.

                       Tomorrow's picture: open space
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    Authors & editors: [34]Robert Nemiroff ([35]MTU) & [36]Jerry Bonnell
                                 ([37]UMCP)
          NASA Official: Phillip Newman [38]Specific rights apply.
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                A service of: [40]ASD at [41]NASA / [42]GSFC
                           & [43]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1911/Arp273_HubblePohl_1824.jpg
   3. https://www.nasa.gov/
   4. http://www.esa.int/
   5. https://www.nasa.gov/mission_pages/hubble/main/index.html
   6. https://www.astrobin.com/users/Rudy_Pohl/
   7. https://i.pinimg.com/originals/9d/b0/6a/9db06a017b05968973ad6b19556a7de7.jpg
   8. https://apod.nasa.gov/apod/ap170510.html
   9. https://apod.nasa.gov/apod/colliding_galaxies.html
  10. https://en.wikipedia.org/wiki/Arp_273
  11. https://apod.nasa.gov/apod/ap161218.html
  12. https://phys.org/news/2016-10-galaxies-collide.html
  13. http://burro.astr.cwru.edu/Academics/Astr221/Gravity/tides.html
  14. https://apod.nasa.gov/apod/ap130514.html
  15. http://www.webexhibits.org/causesofcolor/3.html
  16. https://apod.nasa.gov/apod/ap151023.html
  17. https://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve
  18. https://apod.nasa.gov/apod/ap110421.html
  19. http://www.spacetelescope.org/videos/heic1107a/
  20. http://www.space.com/19964-milky-way-galaxy-cannibalism-hubble.html
  21. https://en.wikipedia.org/wiki/Satellite_galaxies_of_the_Milky_Way
  22. https://apod.nasa.gov/apod/ap120107.html
  23. https://apod.nasa.gov/apod/ap191119.html
  24. https://apod.nasa.gov/apod/archivepix.html
  25. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  26. https://apod.nasa.gov/apod/lib/aptree.html
  27. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  28. https://apod.nasa.gov/apod/calendar/allyears.html
  29. https://apod.nasa.gov/apod.rss
  30. https://apod.nasa.gov/apod/lib/edlinks.html
  31. https://apod.nasa.gov/apod/lib/about_apod.html
  32. http://asterisk.apod.com/discuss_apod.php?date=191120
  33. https://apod.nasa.gov/apod/ap191121.html
  34. http://www.phy.mtu.edu/faculty/Nemiroff.html
  35. http://www.phy.mtu.edu/
  36. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  37. http://www.astro.umd.edu/
  38. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  39. https://www.nasa.gov/about/highlights/HP_Privacy.html
  40. https://astrophysics.gsfc.nasa.gov/
  41. https://www.nasa.gov/
  42. https://www.nasa.gov/centers/goddard/
  43. http://www.mtu.edu/