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 July 7
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                        The Double Cluster in Perseus
               Image Credit & [3]Copyright: [4]Mårten Frosth

   Explanation: [5]This pretty starfield spans about three full moons (1.5
   degrees) across the heroic northern constellation of [6]Perseus. It
   holds the famous [7]pair of open star clusters, h and Chi Persei. Also
   cataloged as [8]NGC 869 (top) and NGC 884, both clusters are about
   7,000 light-years away and contain stars much younger and hotter than
   the Sun. Separated by only a few hundred light-years, the clusters are
   both 13 million years young [9]based on the ages of their
   [10]individual stars, evidence that they were likely a product of the
   same star-forming region. Always a rewarding [11]sight in binoculars,
   the Double Cluster is even visible to the unaided eye from [12]dark
   locations.

                      Tomorrow's picture: light-weekend
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    Authors & editors: [24]Robert Nemiroff ([25]MTU) & [26]Jerry Bonnell
                                 ([27]UMCP)
          NASA Official: Phillip Newman [28]Specific rights apply.
              [29]NASA Web Privacy Policy and Important Notices
                A service of: [30]ASD at [31]NASA / [32]GSFC
                           & [33]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2307/Caldwell_14_2023_HaLRGB_LRGB_stars_wm.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.frosth.se/
   5. https://www.frosth.se/2023/05/07/caldwell-14-double-cluster/
   6. http://en.wikipedia.org/wiki/Perseus_constellation
   7. https://www.nasa.gov/feature/goddard/caldwell-14
   8. http://www.messier.seds.org/xtra/ngc/n0869.html
   9. http://arxiv.org/abs/astro-ph/0205130
  10. http://www.messier.seds.org/open.html
  11. http://10minuteastronomy.wordpress.com/2009/11/21/mission-11-cassiopeia-and-the-double-cluster/
  12. https://apod.nasa.gov/apod/ap060413.html
  13. https://apod.nasa.gov/apod/ap230706.html
  14. https://apod.nasa.gov/apod/archivepix.html
  15. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  16. https://apod.nasa.gov/apod/lib/aptree.html
  17. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  18. https://apod.nasa.gov/apod/calendar/allyears.html
  19. https://apod.nasa.gov/apod.rss
  20. https://apod.nasa.gov/apod/lib/edlinks.html
  21. https://apod.nasa.gov/apod/lib/about_apod.html
  22. http://asterisk.apod.com/discuss_apod.php?date=230707
  23. https://apod.nasa.gov/apod/ap230708.html
  24. http://www.phy.mtu.edu/faculty/Nemiroff.html
  25. http://www.phy.mtu.edu/
  26. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  27. http://www.astro.umd.edu/
  28. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  29. https://www.nasa.gov/about/highlights/HP_Privacy.html
  30. https://astrophysics.gsfc.nasa.gov/
  31. https://www.nasa.gov/
  32. https://www.nasa.gov/centers/goddard/
  33. http://www.mtu.edu/