Astronomy Picture of the Day

                         Astronomy Picture of the Day

    Discover the cosmos! [1] Each day a different image or photograph of our
 fascinating universe is featured, along with a brief explanation written by a
                           professional astronomer.

                                  2019 May 16
                                      [2]
                        Dark Skies: Turn on the Night
              Image Credit & Copyright: Jeff Dai [3] (TWAN [4] )

Explanation: Have you ever experienced a really dark night sky? One common and
amazing feature is the glowing band of our Milky Way galaxy stretching [5]
from horizon to horizon. If you live in or near a big city, though, you might
not know this because city lights [6]  reflecting off the Earth's atmosphere
[7]  could only allow you to see [8]  the Moon and a few stars. Today,
however, being UNESCO [9] 's International Day of Light [10] , the
International Astronomical Union [11]  is asking people to Turn on the Night
[12]  by trying to better understand, and in the future better reduce, light
pollution [13] . You can practice even now by going to the main APOD website
at NASA [14] and hovering your cursor over the Before image [15] . The After
[16] picture that comes up is a panorama of four exposures taken with the same
camera and from the same location, showing what happened recently [17]  in
China [18]  when people in Kaihua County [19] decided to turn down many of
their lights. Visible in the Before picture [20] are the stars Sirius (left of
center) and Betelgeuse, while visible in the After picture [21] are thousands
of stars with the arching band of our Milky Way Galaxy. Humanity has lived for
millennia under a dark night sky [22] , and connecting to it has importance
[23]  for both natural and cultural heritage.

                    Tomorrow's picture: distant reflections

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    Authors & editors: Robert Nemiroff [35] (MTU [36] ) & Jerry Bonnell [37]
                                  (UMCP [38] )
          NASA Official:  Phillip Newman Specific rights apply [39] .
              NASA Web Privacy Policy and Important Notices [40]
              A service of: ASD [41]  at NASA [42]  / GSFC [43]
                           & Michigan Tech. U. [44]
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Site notes:
  [1] archivepix.html
  [2] image/1905/TotnAfter_Dai_3000.jpg
  [3] http://www.twanight.org/Dai
  [4] http://www.twanight.org/
  [5] ap070508.html
  [6] ap160630.html
  [7]
https://www.nasa.gov/sites/default/files/imag...
662995main_upper-atmosphere-MOS_full.jpg
  [8]
https://petapixel.com/2017/02/09/
light-pollution-changes-view-orion-constellation/
  [9] https://en.unesco.org/about-us/introducing-un...
  [10] https://www.lightday.org/events
  [11] https://www.iau.org/administration/about/
  [12] https://mailchi.mp/laserclassroom.com/turnont...
  [13] https://en.wikipedia.org/wiki/Light_pollution...
  [14] http://apod.nasa.gov/
  [15] image/1905/TotnBefore_Dai_3000.jpg
  [16] image/1905/TotnAfter_Dai_3000.jpg
  [17] http://www.twanight.org/newTWAN/news.asp?news...
  [18] https://en.wikipedia.org/wiki/China
  [19] https://en.wikipedia.org/wiki/Kaihua_County
  [20] image/1905/TotnBefore_Dai_3000.jpg
  [21] image/1905/TotnAfter_Dai_3000.jpg
  [22] https://www.iau-100.org/dark-skies-for-all
  [23] https://www.globeatnight.org/
  [24] ap190515.html
  [25] archivepix.html
  [26] lib/apsubmit2015.html
  [27] lib/aptree.html
  [28] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
  [29] calendar/allyears.html
  [30] /apod.rss
  [31] lib/edlinks.html
  [32] lib/about_apod.html
  [33] http://asterisk.apod.com/discuss_apod.php?dat...
  [34] ap190517.html
  [35] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [36] http://www.phy.mtu.edu/
  [37] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
  [38] http://www.astro.umd.edu/
  [39] lib/about_apod.html#srapply
  [40] https://www.nasa.gov/about/highlights/HP_Priv...
  [41] https://astrophysics.gsfc.nasa.gov/
  [42] https://www.nasa.gov/
  [43] https://www.nasa.gov/centers/goddard/
  [44] http://www.mtu.edu/

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