                         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 May 9
                                      [2]
                                  Messier 5
  Image Credit & Copyright [3] : Adam Block [4] , Mt. Lemmon SkyCenter [5] ,
                          University of Arizona [6]

Explanation: "Beautiful Nebula discovered between the Balance [Libra] & the
Serpent [Serpens] ..." begins the description of the 5th entry [7] in 18th
century astronomer Charles Messier's famous catalog of nebulae and star
clusters. Though it appeared to Messier [8]  to be fuzzy and round and without
stars, Messier 5 [9]  (M5) is now known to be a globular star cluster, 100,000
stars or more, bound by gravity and packed into a region around 165
light-years in diameter. It lies some 25,000 light-years away. Roaming the
halo of our galaxy [10] , globular star clusters are ancient members of the
Milky Way. M5 is [11] one of the oldest globulars, its stars estimated to be
nearly 13 billion years old. The beautiful star cluster is a popular target
for earthbound telescopes [12] . Even close to its dense core [13] , the
cluster's red and blue [14]  giant stars, and rejuvenated [15] blue stragglers
[16]  stand out with yellowish and blue hues in this sharp color image [17] .

                Tomorrow's picture: Halley Dust and Milky Way

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    Authors & editors: Robert Nemiroff [29] (MTU [30] ) & Jerry Bonnell [31]
                                  (UMCP [32] )
          NASA Official:  Phillip Newman Specific rights apply [33] .
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Site notes:
  [1] archivepix.html
  [2] image/1905/m5sBlock.jpg
  [3] lib/about_apod.html#srapply
  [4] https://www.adamblockphotos.com/
  [5] http://skycenter.arizona.edu/
  [6] http://www.as.arizona.edu/
  [7] http://messier.seds.org/Mdes/dm005.html
  [8] http://messier.seds.org/xtra/history/m-deep.html
  [9] http://messier.seds.org/m/m005.html
  [10] http://cass.ucsd.edu/archive/public/tutorial/MW.html
  [11] https://www.nasa.gov/feature/goddard/2017/messier-5
  [12] http://earthsky.org/clusters-nebulae-galaxies/
m5-best-globular-cluster-for-small-telescopes
  [13] ap031213.html
  [14] ap010223.html
  [15] https://arxiv.org/abs/astro-ph/0605047
  [16] https://www.spacetelescope.org/images/heic0918b/
  [17] https://www.adamblockphotos.com/m5.html
  [18] ap190508.html
  [19] archivepix.html
  [20] lib/apsubmit2015.html
  [21] lib/aptree.html
  [22] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [23] calendar/allyears.html
  [24] /apod.rss
  [25] lib/edlinks.html
  [26] lib/about_apod.html
  [27] http://asterisk.apod.com/discuss_apod.php?date=190509
  [28] ap190510.html
  [29] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [30] http://www.phy.mtu.edu/
  [31] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [32] http://www.astro.umd.edu/
  [33] lib/about_apod.html#srapply
  [34] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [35] https://astrophysics.gsfc.nasa.gov/
  [36] https://www.nasa.gov/
  [37] https://www.nasa.gov/centers/goddard/
  [38] http://www.mtu.edu/
