             APOD: 2017 September 29 - Puppis A Supernova Remnant

                         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.

                              2017 September 29
                                      [2]
                          Puppis A Supernova Remnant
                Image Credit & Copyright [3] : Don Goldman [4]

Explanation: Driven by the explosion [5]  of a massive star, supernova remnant
Puppis A is blasting into the surrounding interstellar medium about 7,000
light-years away. At that distance, this colorful telescopic field [6]  based
on broadband and narrowband optical image data is about 60 light-years across.
As the supernova remnant (upper right) expands into its clumpy, non-uniform
surroundings, shocked filaments of oxygen atoms glow in green-blue hues.
Hydrogen and nitrogen are in red. Light from the initial supernova itself,
triggered by the collapse of the massive star's core [7] , would have reached
Earth about 3,700 years ago. The Puppis A remnant is actually seen through
outlying emission from the closer but more ancient Vela supernova remnant [8]
, near the crowded plane of our Milky Way galaxy. Still glowing across the
electromagnetic spectrum Puppis A remains one of the brightest sources in the
X-ray sky [9] .

                    Tomorrow's picture: light-weekend [10]

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    Authors & editors: Robert Nemiroff [22] (MTU [23] ) & Jerry Bonnell [24]
                                  (UMCP [25] )
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                           & Michigan Tech. U. [31]
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Site notes:
  [1] archivepix.html
  [2] image/1709/PuppisAWebGoldman1024.jpg
  [3] lib/about_apod.html#srapply
  [4] http://astrodonimaging.com/
  [5] http://chandra.harvard.edu/photo/2014/puppisa/
  [6] http://astrodonimaging.com/gallery/puppis-a-2/
  [7] ap961114.html
  [8] ap150101.html
  [9] http://arxiv.org/abs/1305.1275
  [10] ap170930.html
  [11] ap170928.html
  [12] archivepix.html
  [13] lib/apsubmit2015.html
  [14] lib/aptree.html
  [15] http://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [16] calendar/allyears.html
  [17] /apod.rss
  [18] lib/edlinks.html
  [19] lib/about_apod.html
  [20] http://asterisk.apod.com/discuss_apod.php?date=170929
  [21] ap170930.html
  [22] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [23] http://www.phy.mtu.edu/
  [24] http://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [25] http://www.astro.umd.edu/
  [26] lib/about_apod.html#srapply
  [27] http://www.nasa.gov/about/highlights/HP_Privacy.html
  [28] http://astrophysics.gsfc.nasa.gov/
  [29] http://www.nasa.gov/
  [30] http://www.nasa.gov/centers/goddard/
  [31] http://www.mtu.edu/
