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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.

                                 2020 May 10
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                       The Porpoise Galaxy from Hubble
      Image Credit: [3]NASA, [4]ESA, [5]Hubble, [6]HLA; Reprocessing &
                        Copyright: [7]Raul Villaverde

   Explanation: What's happening to this spiral galaxy? Just a few hundred
   million years ago, NGC 2936, the upper of the two large [8]galaxies
   shown, was likely a [9]normal spiral galaxy -- spinning, creating stars
   -- and minding its own business. But then it got too close to the
   [10]massive elliptical galaxy NGC 2937 below and took a dive. Dubbed
   the [11]Porpoise Galaxy for its iconic shape, NGC 2936 is not only
   being deflected but also being distorted by the [12]close gravitational
   interaction. A burst of young blue stars forms the nose of the porpoise
   toward the right of the upper galaxy, while the center of the spiral
   appears as an eye. Alternatively, the galaxy pair, together known as
   [13]Arp 142, look to some like a [14]penguin protecting an egg. Either
   way, intricate dark dust lanes and bright blue star streams trail the
   troubled galaxy to the lower right. The [15]featured re-processed image
   showing [16]Arp 142 in unprecedented detail was taken by the [17]Hubble
   Space Telescope last year. [18]Arp 142 lies about 300 million light
   years away toward the constellation, coincidently, of the Water Snake
   ([19]Hydra). In a billion years or so the [20]two galaxies will likely
   merge into one larger galaxy.

                    Tomorrow's picture: behind betelgeuse
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    Authors & editors: [32]Robert Nemiroff ([33]MTU) & [34]Jerry Bonnell
                                 ([35]UMCP)
          NASA Official: Phillip Newman [36]Specific rights apply.
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                A service of: [38]ASD at [39]NASA / [40]GSFC
                           & [41]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2005/PorpoiseGalaxy_HubbleFraile_1300.jpg
   3. https://www.nasa.gov/
   4. https://www.esa.int/
   5. https://www.nasa.gov/mission_pages/hubble/story/index.html
   6. https://hla.stsci.edu/
   7. https://www.flickr.com/photos/113243238@N08/
   8. https://www.flickr.com/photos/113243238@N08/31761249883/
   9. https://apod.nasa.gov/apod/ap130416.html
  10. https://apod.nasa.gov/apod/ap120914.html
  11. http://en.wikipedia.org/wiki/Porpoise
  12. https://apod.nasa.gov/apod/ap090426.html
  13. http://www.spacetelescope.org/videos/heic1311a/
  14. https://media.mnn.com/assets/images/2011/06/dads_intro.jpg.560x0_q80_crop-smart.jpg
  15. https://www.flickr.com/photos/113243238@N08/31761249883/
  16. https://ui.adsabs.harvard.edu/abs/2016AAS...22713511R/abstract
  17. http://hubblesite.org/the_telescope/hubble_essentials/quick_facts.php
  18. https://media.stsci.edu/image/3195/gallery/19-interacting-galaxies
  19. http://en.wikipedia.org/wiki/Hydra_(constellation)
  20. https://apod.nasa.gov/apod/ap120604.html
  21. https://apod.nasa.gov/apod/ap200509.html
  22. https://apod.nasa.gov/apod/archivepix.html
  23. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  24. https://apod.nasa.gov/apod/lib/aptree.html
  25. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  26. https://apod.nasa.gov/apod/calendar/allyears.html
  27. https://apod.nasa.gov/apod.rss
  28. https://apod.nasa.gov/apod/lib/edlinks.html
  29. https://apod.nasa.gov/apod/lib/about_apod.html
  30. http://asterisk.apod.com/discuss_apod.php?date=200510
  31. https://apod.nasa.gov/apod/ap200511.html
  32. http://www.phy.mtu.edu/faculty/Nemiroff.html
  33. http://www.phy.mtu.edu/
  34. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  35. http://www.astro.umd.edu/
  36. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  37. https://www.nasa.gov/about/highlights/HP_Privacy.html
  38. https://astrophysics.gsfc.nasa.gov/
  39. https://www.nasa.gov/
  40. https://www.nasa.gov/centers/goddard/
  41. http://www.mtu.edu/