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 January 19
    [2]The featured image shows the nearest major galaxy to our own Milky
   Way Galaxy: the Andromeda Galaxy (M31). Please see the explanation for
                         more detailed information.

                          M31: The Andromeda Galaxy
       Image Credit: [3]Subaru ([4]NAOJ), [5]Hubble ([6]NASA/[7]ESA),
                             [8]Mayall ([9]NSF);
           Processing & Copyright: [10]R. Gendler & [11]R. Croman

   Explanation: The most distant object easily visible to the unaided eye
   is [12]M31, the great [13]Andromeda Galaxy. Even at some two and a half
   million [14]light-years distant, this immense spiral galaxy -- spanning
   [15]over 200,000 light years -- is visible, although as a faint,
   nebulous cloud in the [16]constellation Andromeda. In contrast, a
   bright yellow nucleus, dark winding [17]dust lanes, and expansive
   spiral arms dotted with [18]blue star clusters and [19]red nebulae, are
   recorded in [20]this stunning telescopic image which combines data from
   [21]orbiting Hubble with ground-based images from [22]Subaru and
   [23]Mayall. In only about 5 billion years, the Andromeda galaxy may be
   even [24]easier to see -- as it will likely span the entire night sky
   -- just before it [25]merges with our [26]Milky Way Galaxy.

                       Tomorrow's picture: open space
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     __________________________________________________________________

    Authors & editors: [38]Robert Nemiroff ([39]MTU) & [40]Jerry Bonnell
                                 ([41]UMCP)
          NASA Official: Phillip Newman [42]Specific rights apply.
              [43]NASA Web Privacy Policy and Important Notices
                A service of: [44]ASD at [45]NASA / [46]GSFC
                           & [47]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2201/M31_HstSubaruGendler_5000.jpg
   3. http://www.naoj.org/Introduction/index.html
   4. http://www.naoj.org/
   5. http://hla.stsci.edu/hla_welcome.html
   6. https://www.nasa.gov/
   7. https://www.esa.int/
   8. https://noirlab.edu/public/programs/kitt-peak-national-observatory/nicholas-mayall-4m-telescope/
   9. https://www.nsf.gov/
  10. http://robgendlerastropics.com/Biography2.html
  11. https://www.rc-astro.com/about.html
  12. https://en.wikipedia.org/wiki/Andromeda_Galaxy
  13. https://apod.nasa.gov/apod/ap210625.html
  14. https://spaceplace.nasa.gov/light-year/en/
  15. https://apod.nasa.gov/apod/ap061228.html
  16. http://www.hawastsoc.org/deepsky/and/index.html
  17. https://apod.nasa.gov/apod/ap220117.html
  18. https://apod.nasa.gov/apod/ap211124.html
  19. https://apod.nasa.gov/apod/ap210214.html
  20. http://www.robgendlerastropics.com/M31-HST-Subaru-NOAO-RC.html
  21. https://www.nasa.gov/mission_pages/hubble/story/index.html
  22. https://subarutelescope.org/en/
  23. https://noirlab.edu/public/programs/kitt-peak-national-observatory/nicholas-mayall-4m-telescope/
  24. https://wallpaperaccess.com/full/621501.jpg
  25. https://apod.nasa.gov/apod/ap120604.html
  26. https://imagine.gsfc.nasa.gov/science/objects/milkyway1.html
  27. https://apod.nasa.gov/apod/ap220118.html
  28. https://apod.nasa.gov/apod/archivepix.html
  29. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  30. https://apod.nasa.gov/apod/lib/aptree.html
  31. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  32. https://apod.nasa.gov/apod/calendar/allyears.html
  33. https://apod.nasa.gov/apod.rss
  34. https://apod.nasa.gov/apod/lib/edlinks.html
  35. https://apod.nasa.gov/apod/lib/about_apod.html
  36. http://asterisk.apod.com/discuss_apod.php?date=220119
  37. https://apod.nasa.gov/apod/ap220120.html
  38. http://www.phy.mtu.edu/faculty/Nemiroff.html
  39. http://www.phy.mtu.edu/
  40. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  41. http://www.astro.umd.edu/
  42. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  43. https://www.nasa.gov/about/highlights/HP_Privacy.html
  44. https://astrophysics.gsfc.nasa.gov/
  45. https://www.nasa.gov/
  46. https://www.nasa.gov/centers/goddard/
  47. http://www.mtu.edu/