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 August 15
    [2]See Explanation. Moving the cursor over the image will bring up an
     annotated version. Clicking on the image will bring up the highest
                        resolution version available.

                                Perseid Rain
                  Image Credit & Copyright: [3]Luo Hongyang

   Explanation: Comet dust rained down on planet Earth last week,
   streaking through dark skies in the annual Perseid meteor shower. The
   featured picture is a composite of many images taken from the same
   location over the peak night of [4]the Perseids. The umbrella was
   [5]not needed as a shield from meteors, since they almost entirely
   [6]evaporate high in the [7]Earth's atmosphere. Many of the component
   images featured [8]individual Perseids, while one image featured the
   foreground near [9]Jiuquan City, [10]Gansu Province, [11]China. The
   stellar background includes the central band of our [12]Milky Way
   [13]Galaxy, appearing nearly vertical, as well as the planets
   [14]Jupiter and [15]Saturn on the left. Although the [16]comet dust
   particles are traveling [17]parallel to each other, the resulting
   [18]shower meteors clearly seem to radiate from a single point on the
   sky -- the [19]radiant in the [20]eponymous constellation [21]Perseus.
   The image captured so long an angular field that the [22]curvature of
   the sky is visible in the trajectory of the [23]Perseids.

       Notable APOD Image Submissions: [24]Perseid Meteor Shower 2021
                      Tomorrow's picture: nova visible
     __________________________________________________________________

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    Authors & editors: [36]Robert Nemiroff ([37]MTU) & [38]Jerry Bonnell
                                 ([39]UMCP)
          NASA Official: Phillip Newman [40]Specific rights apply.
              [41]NASA Web Privacy Policy and Important Notices
                A service of: [42]ASD at [43]NASA / [44]GSFC
                           & [45]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2108/PerseidRain2021_Luo_2042.jpg
   3. mailto: mgsluo @at@ gmail .dot. com
   4. https://en.wikipedia.org/wiki/Perseids
   5. https://www.amsmeteors.org/meteor-showers/meteor-faq/#11
   6. https://blogs.nasa.gov/Watch_the_Skies/wp-content/uploads/sites/193/2020/12/Geminid_heights_2019.png
   7. https://spaceplace.nasa.gov/atmosphere/en/
   8. https://apod.nasa.gov/ap210814.html
   9. https://en.wikipedia.org/wiki/Jiuquan
  10. https://youtu.be/U4vwGx3faow
  11. https://en.wikipedia.org/wiki/China
  12. https://apod.nasa.gov/apod/ap200907.html
  13. https://solarsystem.nasa.gov/resources/285/the-milky-way-galaxy/
  14. https://apod.nasa.gov/apod/ap190205.html
  15. https://apod.nasa.gov/apod/ap200419.html
  16. https://apod.nasa.gov/apod/ap180808.html
  17. https://www.mathsisfun.com/geometry/parallel-lines.html
  18. https://solarsystem.nasa.gov/asteroids-comets-and-meteors/meteors-and-meteorites/in-depth/
  19. https://en.wikipedia.org/wiki/Radiant_(meteor_shower)
  20. https://www.dictionary.com/browse/eponymous
  21. https://chandra.harvard.edu/photo/constellations/perseus.html
  22. https://apod.nasa.gov/apod/ap190624.html
  23. https://solarsystem.nasa.gov/asteroids-comets-and-meteors/meteors-and-meteorites/perseids/in-depth/
  24. https://www.facebook.com/media/set/?vanity=APOD.Sky&set=a.3855532511217606
  25. https://apod.nasa.gov/apod/ap210814.html
  26. https://apod.nasa.gov/apod/archivepix.html
  27. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  28. https://apod.nasa.gov/apod/lib/aptree.html
  29. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  30. https://apod.nasa.gov/apod/calendar/allyears.html
  31. https://apod.nasa.gov/apod.rss
  32. https://apod.nasa.gov/apod/lib/edlinks.html
  33. https://apod.nasa.gov/apod/lib/about_apod.html
  34. http://asterisk.apod.com/discuss_apod.php?date=210815
  35. https://apod.nasa.gov/apod/ap210816.html
  36. http://www.phy.mtu.edu/faculty/Nemiroff.html
  37. http://www.phy.mtu.edu/
  38. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  39. http://www.astro.umd.edu/
  40. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  41. https://www.nasa.gov/about/highlights/HP_Privacy.html
  42. https://astrophysics.gsfc.nasa.gov/
  43. https://www.nasa.gov/
  44. https://www.nasa.gov/centers/goddard/
  45. http://www.mtu.edu/