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.

                               2018 September 9
                                      [2]
                       M1: The Crab Nebula from Hubble
Image Credit: NASA [3] , ESA [4] , Hubble [5] , J. Hester, A. Loll (ASU [6] )

Explanation: This is the mess that is left when a star explodes. The Crab
Nebula [7] , the result of a supernova [8]  seen in 1054 AD [9] , is filled
with mysterious [10]  filaments. The filaments [11]  are not only tremendously
complex, but appear to have less mass than expelled [12]  in the original
supernova and a higher speed than expected [13]  from a free explosion. The
featured image [14] , taken by the Hubble Space Telescope [15] , is presented
in three colors chosen for scientific interest [16] . The Crab Nebula [17]
spans about 10 light-years [18] . In the nebula [19] 's very center lies a
pulsar [20] : a neutron star [21]  as massive as the Sun [22] but with only
the size of a small town [23] . The Crab Pulsar [24]  rotates about 30 times
each second.

                      Tomorrow's picture: a view on mars

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    Authors & editors: Robert Nemiroff [36] (MTU [37] ) & Jerry Bonnell [38]
                                  (UMCP [39] )
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              A service of: ASD [42]  at NASA [43]  / GSFC [44]
                           & Michigan Tech. U. [45]
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Site notes:
  [1] archivepix.html
  [2] image/1809/CrabNebula_Hubble_3864.jpg
  [3] https://www.nasa.gov/
  [4] http://sci.esa.int/hubble/
  [5] https://www.nasa.gov/mission_pages/hubble/sto...
  [6] http://sese.asu.edu/
  [7] http://messier.seds.org/more/m001_h2.html
  [8] http://imagine.gsfc.nasa.gov/science/objects/...
  [9]  http://messier.seds.org/more/m001_sn.html
  [10] http://www.youtube.com/watch?v=5VnJ9pRR8-8
  [11] ap980208.html
  [12] http://adsabs.harvard.edu/abs/1995ApJ...454L....
  [13] http://adsabs.harvard.edu/abs/1998PASP..110.....
  [14] https://www.spacetelescope.org/images/heic051...
  [15] ap950810.html
  [16] http://s9.favim.com/orig/131225/cat-galaxy-gl...
  [17] http://en.wikipedia.org/wiki/Crab_Nebula
  [18]
http://starchild.gsfc.nasa.gov/docs/StarChild...
  [19] https://www.youtube.com/watch?v=vPxLVgTIAbk
  [20] http://www.jb.man.ac.uk/~pulsar/Education/Sou...
  [21] http://www.astro.umd.edu/~miller/nstar.html
  [22] https://solarsystem.nasa.gov/solar-system/sun...
  [23] http://www.cityofhoughton.com/
  [24] ap020920.html
  [25] ap180908.html
  [26] archivepix.html
  [27] lib/apsubmit2015.html
  [28] lib/aptree.html
  [29] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
  [30] calendar/allyears.html
  [31] /apod.rss
  [32] lib/edlinks.html
  [33] lib/about_apod.html
  [34] http://asterisk.apod.com/discuss_apod.php?dat...
  [35] ap180910.html
  [36] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [37] http://www.phy.mtu.edu/
  [38] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
  [39] http://www.astro.umd.edu/
  [40] lib/about_apod.html#srapply
  [41] https://www.nasa.gov/about/highlights/HP_Priv...
  [42] https://astrophysics.gsfc.nasa.gov/
  [43] https://www.nasa.gov/
  [44] https://www.nasa.gov/centers/goddard/
  [45] http://www.mtu.edu/

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