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.

                              2019 September 1
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                       M45: The Pleiades Star Cluster
      Image Credit & Copyright: [3]Marco Lorenzi ([4]Glittering Lights)

   Explanation: Have you ever seen the Pleiades star cluster? Even if you
   have, you probably have never seen it as dusty as this. Perhaps the
   most famous star cluster on the sky, the bright stars of the
   [5]Pleiades can be seen without binoculars from even the depths of a
   [6]light-polluted city. With a long exposure from a dark location,
   though, the dust cloud surrounding the [7]Pleiades star [8]cluster
   becomes very evident. The [9]featured exposure took over 12 hours and
   covers a sky area several times the size of the full [10]moon. Also
   known as the [11]Seven Sisters and [12]M45, [13]the Pleiades lies about
   400 light years away toward the constellation of the Bull ([14]Taurus).
   A [15]common legend with a [16]modern twist is that one of the brighter
   stars faded since the cluster was named, leaving only six stars visible
   to the unaided eye. The actual number of [17]Pleiades stars visible,
   however, may be more or less than seven, depending on the [18]darkness
   of the surrounding sky and the [19]clarity of the observer's eyesight.

                   Tomorrow's picture: infrared sky spider
     __________________________________________________________________

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    Authors & editors: [31]Robert Nemiroff ([32]MTU) & [33]Jerry Bonnell
                                 ([34]UMCP)
          NASA Official: Phillip Newman [35]Specific rights apply.
              [36]NASA Web Privacy Policy and Important Notices
                A service of: [37]ASD at [38]NASA / [39]GSFC
                           & [40]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1909/m45_lorenzi_3832.jpg
   3. http://www.glitteringlights.com/About/About-Me
   4. http://www.glitteringlights.com/
   5. https://en.wikipedia.org/wiki/Pleiades
   6. http://antwrp.gsfc.nasa.gov/apod/image/0208/earthlights02_dmsp_big.jpg
   7. https://apod.nasa.gov/apod/ap091205.html
   8. http://asterisk.apod.com/viewtopic.php?f=24&t=18009
   9. http://www.glitteringlights.com/Images/Open-and-Globular-clusters/i-3CJCbtP
  10. http://solarsystem.nasa.gov/planets/profile.cfm?Object=Moon
  11. http://www.naic.edu/~gibson/pleiades/pleiades_myth.html
  12. https://apod.nasa.gov/apod/ap131122.html
  13. http://www.skyandtelescope.com/astronomy-news/observing-news/many-pleiades-can-see10222014/
  14. https://en.wikipedia.org/wiki/Taurus_(constellation)
  15. http://arxiv.org/ftp/arxiv/papers/0810/0810.1592.pdf
  16. http://kencroswell.com/GD50.html
  17. http://www.youtube.com/watch?v=p6prI0Zfw80
  18. https://apod.nasa.gov/apod/ap010827.html
  19. http://en.wikipedia.org/wiki/File:Snellen_chart.svg
  20. https://apod.nasa.gov/apod/ap190831.html
  21. https://apod.nasa.gov/apod/archivepix.html
  22. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  23. https://apod.nasa.gov/apod/lib/aptree.html
  24. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  25. https://apod.nasa.gov/apod/calendar/allyears.html
  26. https://apod.nasa.gov/apod.rss
  27. https://apod.nasa.gov/apod/lib/edlinks.html
  28. https://apod.nasa.gov/apod/lib/about_apod.html
  29. http://asterisk.apod.com/discuss_apod.php?date=190901
  30. https://apod.nasa.gov/apod/ap190902.html
  31. http://www.phy.mtu.edu/faculty/Nemiroff.html
  32. http://www.phy.mtu.edu/
  33. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  34. http://www.astro.umd.edu/
  35. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  36. https://www.nasa.gov/about/highlights/HP_Privacy.html
  37. https://astrophysics.gsfc.nasa.gov/
  38. https://www.nasa.gov/
  39. https://www.nasa.gov/centers/goddard/
  40. http://www.mtu.edu/