                         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 February 23
                                      [2]
                      The Stars of the Triangulum Galaxy
Image Credit: NASA [3] , ESA [4] , M. Durbin, J. Dalcanton, and B. F. Williams
                        (University of Washington [5] )

Explanation: Like grains of sand [6]  on a cosmic beach, stars of the
Triangulum Galaxy are resolved in this sharp mosaic from the Hubble Space
Telescope's Advanced Camera for Surveys ( ACS [7] ). The inner region of the
galaxy spanning over 17,000 light-years is covered at extreme resolution, the
second largest image [8]  ever released by Hubble. At its center is the
bright, densely packed galactic core surrounded by a loose array of dark dust
lanes mixed with the stars in the galactic plane. Also known as M33, the
face-on spiral galaxy lies 3 million light-years away in the small northern
constellation Triangulum. Over 50,000 light-years in diameter, the Triangulum
Galaxy [9]  is the third largest in the Local Group [10] of galaxies after the
Andromeda Galaxy (M31), and our own Milky Way. Of course, to fully appreciate
the Triangulum's stars, star clusters, and bright nebulae captured in this
Hubble mosaic, you'll need to use a zoom tool [11] .

                       Tomorrow's picture: light echoes

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    Authors & editors: Robert Nemiroff [23] (MTU [24] ) & Jerry Bonnell [25]
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Site notes:
  [1] archivepix.html
  [2] image/1902/heic1901aTriangulum.jpg
  [3] https://www.nasa.gov/
  [4] http://www.esa.int/ESA
  [5] http://depts.washington.edu/astron/
  [6] http://astronomy.swin.edu.au/staff/gmackie/billions.html
  [7] http://hubblesite.org/sci.d.tech/nuts_.and._bolts/ instruments/acs/
  [8] https://spacetelescope.org/news/heic1901/
  [9] ap180927.html
  [10] http://atlasoftheuniverse.com/localgr.html
  [11] https://www.spacetelescope.org/images/heic1901a/zoomable/
  [12] ap190222.html
  [13] archivepix.html
  [14] lib/apsubmit2015.html
  [15] lib/aptree.html
  [16] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [17] calendar/allyears.html
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  [19] lib/edlinks.html
  [20] lib/about_apod.html
  [21] http://asterisk.apod.com/discuss_apod.php?date=190223
  [22] ap190224.html
  [23] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [24] http://www.phy.mtu.edu/
  [25] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [26] http://www.astro.umd.edu/
  [27] lib/about_apod.html#srapply
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  [29] https://astrophysics.gsfc.nasa.gov/
  [30] https://www.nasa.gov/
  [31] https://www.nasa.gov/centers/goddard/
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