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 November 17
   [2]The Hubble image shows the two spiral galaxies directly overlapping
   in the system designated NGC 3314. Please see the explanation for more
                            detailed information.

                       NGC 3314: When Galaxies Overlap
       Image Credit: [3]NASA, [4]ESA, Hubble; Processing & Copyright:
              [5]William Ostling ([6]The Astronomy Enthusiast)

   Explanation: Why doesn't the nearby galaxy create a [7]gravitational
   lensing effect on the background galaxy? It does, but since both
   [8]galaxies are so nearby, the angular shift is much smaller than the
   [9]angular sizes of the galaxies themselves. The featured [10]Hubble
   image of [11]NGC 3314 shows two large spiral galaxies which happen to
   [12]line up exactly. The foreground spiral [13]NGC 3314a appears nearly
   face-on with its [14]pinwheel shape defined by young bright star
   clusters. Against the glow of the background galaxy NGC 3314b, though,
   dark swirling lanes of [15]interstellar dust can also be seen tracing
   the nearer spiral's structure. Both galaxies appear on the edge of the
   [16]Hydra Cluster of Galaxies, a cluster that is about 200 million
   light years away. [17]Gravitational lens distortions are much easier to
   see when the [18]lensing galaxy is smaller and further away. Then, the
   background galaxy may even be distorted into a [19]ring around the
   nearer. Fast gravitational lens flashes due to stars in the foreground
   galaxy [20]momentarily magnifying the light from stars in the
   background galaxy might one day be visible in future observing
   campaigns with high-resolution telescopes.

                       Tomorrow's picture: open space
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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/2111/NGC3314_HubbleOstling_2014.jpg
   3. https://www.nasa.gov/
   4. https://esahubble.org/
   5. https://www.instagram.com/the_astronomy_enthusiast/
   6. https://theastroenthusiast.com/
   7. https://www.science.org.au/curious/space-time/gravitational-lensing
   8. https://spaceplace.nasa.gov/galaxy/en/
   9. https://lonewolfonline.net/angular-size/
  10. https://www.nasa.gov/content/goddard/hubble-history-timeline
  11. https://en.wikipedia.org/wiki/NGC_3314
  12. https://i.redd.it/18w9o6xdiip21.jpg
  13. https://ui.adsabs.harvard.edu/abs/2001AJ....122.1369K/abstract
  14. https://apod.nasa.gov/apod/ap150614.html
  15. https://curator.jsc.nasa.gov/stardust/interstellardust.cfm
  16. https://apod.nasa.gov/apod/ap120512.html
  17. https://apod.nasa.gov/apod/ap210823.html
  18. https://www.reddit.com/r/Astronomy/comments/2peq2b/hey_guys_this_is_ngc_3314_according_to_nasa_this/
  19. https://apod.nasa.gov/apod/ap111221.html
  20. https://ui.adsabs.harvard.edu/abs/2003hst..prop.9977B/abstract
  21. https://apod.nasa.gov/apod/ap211116.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=211117
  31. https://apod.nasa.gov/apod/ap211118.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/