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 October 17
                                      [2]
                      M15: Dense Globular Star Cluster
        Image Credit & Copyright [3] : Bernhard Hubl [4] (CEDIC [5] )

Explanation: Messier 15 is [6] an immense swarm of over 100,000 stars. A 13
billion year old relic of the early formative years of our galaxy it's one of
about 170 globular star clusters that still roam the halo of the Milky Way.
Centered in this sharp telescopic view, M15 [7]  lies about 35,000 light years
[8]  away toward the constellation Pegasus, well beyond the spiky foreground
stars. Its diameter is about 200 light-years. But more than half its stars are
packed into the central 10 light-years or so, one of the densest
concentrations of stars known. Hubble-based measurements [9]  of the
increasing velocities of M15's central stars are evidence that a massive black
hole resides at the center of dense globular cluster M15. [10]

                     Tomorrow's picture: gamma-ray sunset

-------------------------------------------------------------------------------
< [11] | Archive [12] | Submissions [13] | Index [14] | Search [15] | Calendar
  [16] | RSS [17] | Education [18] | About APOD [19] | Discuss [20] | > [21]
-------------------------------------------------------------------------------

    Authors & editors: Robert Nemiroff [22] (MTU [23] ) & Jerry Bonnell [24]
                                  (UMCP [25] )
          NASA Official:  Phillip Newman Specific rights apply [26] .
              NASA Web Privacy Policy and Important Notices [27]
              A service of: ASD [28]  at NASA [29]  / GSFC [30]
                           & Michigan Tech. U. [31]
----------
Site notes:
  [1] archivepix.html
  [2] image/1810/M015-2_Hubl.jpg
  [3] lib/about_apod.html#srapply
  [4] http://astrophoton.com/about_me.htm
  [5] http://www.cedic.at/
  [6] https://www.universetoday.com/31634/messier-1...
  [7] http://www.astrophoton.com/M015-2.htm
  [8] http://chandra.harvard.edu/photo/cosmic_dista...
  [9] https://arxiv.org/abs/astro-ph/0209314
  [10] http://hubblesite.org/news_release/news/2002-...
  [11] ap181016.html
  [12] archivepix.html
  [13] lib/apsubmit2015.html
  [14] lib/aptree.html
  [15] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
  [16] calendar/allyears.html
  [17] /apod.rss
  [18] lib/edlinks.html
  [19] lib/about_apod.html
  [20] http://asterisk.apod.com/discuss_apod.php?dat...
  [21] ap181018.html
  [22] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [23] http://www.phy.mtu.edu/
  [24] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
  [25] http://www.astro.umd.edu/
  [26] lib/about_apod.html#srapply
  [27] https://www.nasa.gov/about/highlights/HP_Priv...
  [28] https://astrophysics.gsfc.nasa.gov/
  [29] https://www.nasa.gov/
  [30] https://www.nasa.gov/centers/goddard/
  [31] http://www.mtu.edu/

--- Mystic BBS v1.12 A39 (Windows/32)
 * Origin: FIDONet - The Positronium Repository (1:393/68)