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.

                               2022 November 3
    [2]The featured image shows steam rising from several separated vents
   at Hverir, a geothermally active field in Iceland. Green aurora rage in
        the background. Please see the explanation for more detailed
                                information.

                         M33: The Triangulum Galaxy
         Image Credit & [3]Copyright: Processing - [4]Robert Gendler
   Data - [5]Hubble Legacy Archive, [6]KPNO, [7]NOIRLab, [8]NSF, [9]Aura,
                             [10]Amateur Sources

   Explanation: The small, northern constellation [11]Triangulum harbors
   this magnificent face-on spiral galaxy, M33. Its popular names include
   the Pinwheel Galaxy or just the [12]Triangulum Galaxy. M33 is over
   50,000 light-years in diameter, third largest in the [13]Local Group of
   galaxies after the Andromeda Galaxy (M31), and our own Milky Way.
   [14]About 3 million light-years from the Milky Way, M33 is itself
   thought to be a satellite of the Andromeda Galaxy and [15]astronomers
   in these two galaxies would likely have spectacular views of each
   other's grand spiral star systems. As for the view from the Milky Way,
   [16]this sharp image combines data from telescopes on and around planet
   Earth to show off M33's blue star clusters and pinkish [17]star forming
   regions along the galaxy's loosely wound spiral arms. In fact, the
   [18]cavernous NGC 604 is the brightest star forming region, seen here
   at about the 1 o'clock position from the galaxy center. Like M31, M33's
   population of well-measured variable stars have helped make this nearby
   spiral a cosmic yardstick for [19]establishing the distance [20]scale
   of the Universe.

                     Tomorrow's picture: pixels in 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.
              [37]NASA Web Privacy Policy and Important Notices
                A service of: [38]ASD at [39]NASA / [40]GSFC,
                         [41]NASA Science Activation
                           & [42]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2211/M33-NOIR-HST-LL.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. http://www.robgendlerastropics.com/
   5. https://hla.stsci.edu/
   6. https://noirlab.edu/public/programs/kitt-peak-national-observatory/nicholas-mayall-4m-telescope/
   7. https://noirlab.edu/public/
   8. https://www.nsf.gov/
   9. https://www.aura-astronomy.org/
  10. http://www.robgendlerastropics.com/M33-NOIR-HST.html
  11. http://www.hawastsoc.org/deepsky/tri/index.html
  12. http://messier.seds.org/m/m033.html
  13. http://atlasoftheuniverse.com/localgr.html
  14. https://apod.nasa.gov/apod/ap211106.html
  15. http://arxiv.org/abs/astro-ph?papernum=0506609
  16. http://www.robgendlerastropics.com/M33-NOIR-HST.html
  17. https://apod.nasa.gov/apod/ap091017.html
  18. https://esahubble.org/images/opo9627c/
  19. http://adsabs.harvard.edu/cgi-bin/bib_query?1926ApJ....63..236H
  20. http://antwrp.gsfc.nasa.gov/diamond_jubilee/debate96.html
  21. https://apod.nasa.gov/apod/ap221102.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=221103
  31. https://apod.nasa.gov/apod/ap221104.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. https://science.nasa.gov/learners
  42. http://www.mtu.edu/