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.

                               2020 January 25
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                               Rubin's Galaxy
        Image Credit: [3]NASA, [4]ESA, [5]B. Holwerda (University of
                                 Louisville)

   Explanation: [6]In this Hubble Space Telescope image the bright, spiky
   stars lie in the foreground toward the heroic northern constellation
   Perseus and well within our own Milky Way galaxy. In sharp focus beyond
   is [7]UGC 2885, a giant spiral galaxy about 232 million light-years
   distant. Some 800,000 light-years across compared to the Milky Way's
   diameter of 100,000 light-years or so, it has around 1 trillion stars.
   That's about 10 times as many stars as the Milky Way. [8]Part of a
   current investigation to understand how galaxies can grow to such
   enormous sizes, UGC 2885 was also part of [9]astronomer Vera Rubin's
   pioneering study of the rotation of spiral galaxies. Her work was the
   first to convincingly demonstrate the dominating presence of [10]dark
   matter in our universe.

                      Tomorrow's picture: Rubin's ridge
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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]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2001/RubinsGalaxy_hst2000.jpg
   3. https://www.nasa.gov/
   4. https://www.spacetelescope.org/
   5. http://www.physics.louisville.edu/bholwerda/Welcome.html
   6. https://hubblesite.org/contents/media/images/2020/01/4615-Image
   7. https://ui.adsabs.harvard.edu/abs/1980ApJ...238..471R/abstract
   8. https://ui.adsabs.harvard.edu/abs/2017hst..prop15107H/abstract
   9. https://www.annualreviews.org/doi/full/10.1146/annurev-astro-081710-102545
  10. https://www.space.com/vera-rubin.html
  11. https://apod.nasa.gov/apod/ap200124.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=200125
  21. https://apod.nasa.gov/apod/ap200126.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. http://www.mtu.edu/