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 February 23
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                      Arp 78: Peculiar Galaxy in Aries
                Image Credit & [3]Copyright: [4]Josep Drudis

   Explanation: [5]Peculiar spiral galaxy Arp 78 is found within the
   boundaries of the head strong [6]constellation Aries. Some 100 million
   light-years beyond the stars and nebulae of our Milky Way galaxy, the
   island universe is an enormous 200,000 light-years across. [7]Also
   known as NGC 772, it sports a prominent, outer spiral arm in [8]this
   detailed cosmic portrait. Tracking along sweeping dust lanes and
   [9]lined with young blue star clusters, Arp 78's overdeveloped spiral
   arm is [10]pumped-up by galactic-scale gravitational tides.
   Interactions with its brightest companion galaxy, the more compact NGC
   770 seen above and right of the larger spiral, are likely responsible.
   Embedded in faint star streams revealed in the deep telescopic
   exposure, NGC 770's fuzzy, elliptical appearance contrasts nicely with
   spiky foreground Milky Way stars in matching yellowish hues.

                 Tomorrow's picture: beyond Jones-Emberson 1
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    Authors & editors: [22]Robert Nemiroff ([23]MTU) & [24]Jerry Bonnell
                                 ([25]UMCP)
          NASA Official: Phillip Newman [26]Specific rights apply.
              [27]NASA Web Privacy Policy and Important Notices
                A service of: [28]ASD at [29]NASA / [30]GSFC,
                         [31]NASA Science Activation
                           & [32]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2302/NGC772-L2bh-RGB-19-8aT-cC.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. http://www.astrodrudis.com/
   5. http://ned.ipac.caltech.edu/level5/Arp/frames.html
   6. http://hawastsoc.org/deepsky/ari/index.html
   7. https://www.nasa.gov/image-feature/goddard/2019/hubble-spots-a-curious-spiral
   8. https://astrodrudis.com/ngc-772-and-companions/
   9. http://arxiv.org/abs/0810.1748
  10. https://noirlab.edu/public/images/noirlab2209a/
  11. https://apod.nasa.gov/apod/ap230222.html
  12. https://apod.nasa.gov/apod/archivepix.html
  13. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  14. https://apod.nasa.gov/apod/lib/aptree.html
  15. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  16. https://apod.nasa.gov/apod/calendar/allyears.html
  17. https://apod.nasa.gov/apod.rss
  18. https://apod.nasa.gov/apod/lib/edlinks.html
  19. https://apod.nasa.gov/apod/lib/about_apod.html
  20. http://asterisk.apod.com/discuss_apod.php?date=230223
  21. https://apod.nasa.gov/apod/ap230224.html
  22. http://www.phy.mtu.edu/faculty/Nemiroff.html
  23. http://www.phy.mtu.edu/
  24. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  25. http://www.astro.umd.edu/
  26. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  27. https://www.nasa.gov/about/highlights/HP_Privacy.html
  28. https://astrophysics.gsfc.nasa.gov/
  29. https://www.nasa.gov/
  30. https://www.nasa.gov/centers/goddard/
  31. https://science.nasa.gov/learners
  32. http://www.mtu.edu/