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 July 18
   [2]The picture shows the Andromeda Galaxy, M31, as seen by NASA's GALEX
    spacecraft in ultraviolet light. Please see the explanation for more
                            detailed information.

                     The Andromeda Galaxy in Ultraviolet
               Image Credit: [3]NASA, [4]JPL-Caltech, [5]GALEX

   Explanation: What does the Andromeda galaxy look like in ultraviolet
   light? Young blue stars circling the galactic center dominate. A mere
   2.5 million light-years away, the [6]Andromeda Galaxy, also known as
   M31, really is just next door as large galaxies go. [7]Spanning about
   230,000 light-years, it took 11 different image fields from NASA's
   [8]Galaxy Evolution Explorer (GALEX) satellite telescope to produce
   this gorgeous portrait of the [9]spiral galaxy in [10]ultraviolet light
   in 2003. While its spiral arms stand out in [11]visible light images,
   Andromeda's arms look more like [12]rings in ultraviolet. The rings are
   sites of intense [13]star formation and have been interpreted as
   evidence that Andromeda collided with its smaller neighboring
   [14]elliptical galaxy M32 more than 200 million years ago. The
   [15]Andromeda galaxy and our own comparable [16]Milky Way galaxy are
   the most massive members of the [17]Local Group of galaxies and are
   [18]projected to collide in several billion years -- perhaps around the
   time that our Sun's [19]atmosphere will expand to [20]engulf the Earth.

                    Tomorrow's picture: the galaxy above
     __________________________________________________________________

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    Authors & editors: [32]Robert Nemiroff ([33]MTU) & [34]Jerry Bonnell
                                 ([35]UMCP)
          NASA Official: Phillip Newman [36]Specific rights apply.
              [37]NASA Web Privacy Policy and Important Notices
                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/2107/M31_Galex_6000.jpg
   3. https://www.nasa.gov/
   4. https://www.jpl.nasa.gov/
   5. http://www.galex.caltech.edu/
   6. https://en.wikipedia.org/wiki/Andromeda_Galaxy
   7. https://apod.nasa.gov/apod/ap200925.html
   8. https://www.nasa.gov/mission_pages/galex/galex20120516.html
   9. https://en.wikipedia.org/wiki/Spiral_galaxy
  10. https://science.nasa.gov/ems/10_ultravioletwaves
  11. https://apod.nasa.gov/apod/ap181217.html
  12. https://svs.gsfc.nasa.gov/10485
  13. https://kids.frontiersin.org/articles/10.3389/frym.2019.00092
  14. https://www.nasa.gov/feature/goddard/2017/messier-32
  15. https://apod.nasa.gov/apod/ap200426.html
  16. https://solarsystem.nasa.gov/resources/285/the-milky-way-galaxy/
  17. http://www.atlasoftheuniverse.com/localgr.html
  18. https://ui.adsabs.harvard.edu/abs/2008MNRAS.386..461C/abstract
  19. https://en.wikipedia.org/wiki/Future_of_Earth
  20. https://photobest1.com/wp-content/uploads/2018/11/Funny-Cats-wallpaper-backgrounds-images-09.jpg
  21. https://apod.nasa.gov/apod/ap210717.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=210718
  31. https://apod.nasa.gov/apod/ap210719.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/