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                        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 May 10
       [2]A picture of star clusters M35 and NGC 2158. Please see the
                 explanation for more detailed information.

                       Star Clusters M35 and NGC 2158
    Image Credit & [3]Copyright: [4]CFHT, [5]Coelum, [6]MegaCam, [7]J.-C.
            Cuillandre ([8]CFHT) & [9]G. A. Anselmi ([10]Coelum)

   Explanation: Clusters of stars can be near or far, young or old,
   diffuse or compact. The [11]featured image shows two quite contrasting
   [12]open star clusters in the same field. [13]M35, on the lower left,
   is relatively nearby at 2800 [14]light years distant, relatively young
   at 150 million years old, and relatively diffuse, with about 2500 stars
   spread out over a volume 30 light years across. [15]Bright blue stars
   frequently distinguish younger open clusters like M35. Contrastingly,
   [16]NGC 2158, on the upper right, is four times more distant than
   [17]M35, over 10 times older, and much more compact. NGC 2158's bright
   blue stars have [18]self-destructed, leaving cluster light to be
   dominated by older and yellower stars. In general, open star clusters
   are found in the plane of [19]our Milky Way Galaxy, and contain
   anywhere from 100 to 10,000 stars -- all of which formed at nearly the
   same time. Both open clusters M35 and NGC 2158 can be [20]found
   together with a small telescope toward the constellation of the Twins
   ([21]Gemini).

                      Tomorrow's picture: beyond uluru
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    Authors & editors: [33]Robert Nemiroff ([34]MTU) & [35]Jerry Bonnell
                                 ([36]UMCP)
          NASA Official: Phillip Newman [37]Specific rights apply.
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                A service of: [39]ASD at [40]NASA / [41]GSFC
                           & [42]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2105/M35_CFHT_1736.jpg
   3. https://www.cfht.hawaii.edu/HawaiianStarlight/CFHT_WWW_Copyright.html
   4. https://www.cfht.hawaii.edu/
   5. http://www.coelum.com/
   6. https://www.cfht.hawaii.edu/Instruments/Imaging/Megacam/
   7. http://www.cfht.hawaii.edu/~jcc/
   8. https://www.cfht.hawaii.edu/
   9. http://www.coelum.com/coelum/autori/giovanni-anselmi
  10. http://www.coelum.com/
  11. https://www.cfht.hawaii.edu/HawaiianStarlight/AIOM/English/CFHT-Coelum-AIOM-Nov2018.html
  12. https://en.wikipedia.org/wiki/Open_cluster
  13. https://en.wikipedia.org/wiki/Messier_35
  14. http://starchild.gsfc.nasa.gov/docs/StarChild/questions/question19.html
  15. https://apod.nasa.gov/apod/ap200909.html
  16. https://en.wikipedia.org/wiki/NGC_2158
  17. http://arxiv.org/abs/astro-ph/0011136
  18. http://heasarc.gsfc.nasa.gov/docs/snr.html
  19. http://www.atlasoftheuniverse.com/galaxy.html
  20. https://i.pinimg.com/originals/ee/fe/38/eefe38bf9adcb884b33e41b3815f5e76.jpg
  21. https://en.wikipedia.org/wiki/Gemini_(constellation)
  22. https://apod.nasa.gov/apod/ap210509.html
  23. https://apod.nasa.gov/apod/archivepix.html
  24. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  25. https://apod.nasa.gov/apod/lib/aptree.html
  26. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  27. https://apod.nasa.gov/apod/calendar/allyears.html
  28. https://apod.nasa.gov/apod.rss
  29. https://apod.nasa.gov/apod/lib/edlinks.html
  30. https://apod.nasa.gov/apod/lib/about_apod.html
  31. http://asterisk.apod.com/discuss_apod.php?date=210510
  32. https://apod.nasa.gov/apod/ap210511.html
  33. http://www.phy.mtu.edu/faculty/Nemiroff.html
  34. http://www.phy.mtu.edu/
  35. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  36. http://www.astro.umd.edu/
  37. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  38. https://www.nasa.gov/about/highlights/HP_Privacy.html
  39. https://astrophysics.gsfc.nasa.gov/
  40. https://www.nasa.gov/
  41. https://www.nasa.gov/centers/goddard/
  42. http://www.mtu.edu/