                         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 March 7
                                      [2]
                    Sharpless 249 and the Jellyfish Nebula
Image Credit & Copyright [3] : Data - Steve Milne & Barry Wilson, Processing -
                                Steve Milne [4]

Explanation: Normally faint and elusive, the Jellyfish Nebula is caught in
this alluring [5] telescopic field of view. The entire scene is a two panel
mosaic constructed using narrowband image data, with emission from sulfur,
hydrogen and oxygen atoms shown in red, green and blue hues. It's anchored
right and left by two bright stars, Mu [6]  and Eta [7] Geminorum, at the foot
of the celestial twin [8] . The Jellyfish Nebula itself is right of center,
the brighter arcing ridge of emission with dangling tentacles. In fact, the
cosmic jellyfish is part of bubble-shaped supernova remnant IC 443 [9] , the
expanding debris cloud from a massive star that exploded [10] . Light from the
explosion first reached planet Earth over 30,000 years ago. Like its cousin in
astrophysical [11]  waters the Crab Nebula [12] supernova remnant, the
Jellyfish Nebula is known to harbor [13]  a neutron star, the remnant of the
collapsed stellar core. An emission nebula cataloged as Sharpless [14]  249
fills the field at the upper left. The Jellyfish Nebula is about 5,000
light-years away. At that distance, this image would be about 300 light-years
across.

                  Tomorrow's picture: stardust and starlight

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Site notes:
  [1] archivepix.html
  [2] image/1903/F_JellyFish_FIN_APOD.jpg
  [3] lib/about_apod.html#srapply
  [4] https://www.astrobin.com/users/gnomus/
  [5] http://www.astrobin.com/389416/
  [6] http://stars.astro.illinois.edu/sow/tejat.html
  [7] http://stars.astro.illinois.edu/sow/propus.html
  [8] http://www.hawastsoc.org/deepsky/gem/index.html
  [9] ap060602.html
  [10] http://chandra.harvard.edu/xray_sources/supernovas.html
  [11] http://arxiv.org/abs/1002.2198
  [12] ap180317.html
  [13] http://chandra.harvard.edu/photo/2000/1083/index.html
  [14] http://galaxymap.org/cat/list/sharpless/1
  [15] ap190306.html
  [16] archivepix.html
  [17] lib/apsubmit2015.html
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  [24] http://asterisk.apod.com/discuss_apod.php?date=190307
  [25] ap190308.html
  [26] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [27] http://www.phy.mtu.edu/
  [28] http://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [29] http://www.astro.umd.edu/
  [30] lib/about_apod.html#srapply
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