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 3
                                      [2]
          NGC 1898: Globular Cluster in the Large Magellanic Cloud
                Image Credit: ESA [3] / Hubble [4]  & NASA [5]

Explanation: Jewels don't shine this bright -- only stars do. And almost every
spot in this glittering jewel [6] -box of an image from the Hubble Space
Telescope [7]  is a star. Now some stars are more red than our Sun [8] , and
some more blue -- but all of them are much farther away. Although it takes
light about 8 minutes to reach Earth [9]  from the Sun, NGC 1898 is so far
away that it takes light about 160,000 years [10]  to get here. This huge ball
of stars, NGC 1898 [11] , is called a globular cluster [12]  and resides in
the central bar [13]  of the Large Magellanic Cloud [14]  (LMC) -- a satellite
galaxy [15]  of our large Milky Way Galaxy [16] . The featured multi-colored
image [17]  includes light from the infrared [18]  to the ultraviolet [19] and
was taken to help determine if the stars of NGC 1898 [20]  all formed at the
same time, or at different times. There are increasing indications that most
globular clusters formed stars in stages [21] , and that, in particular, stars
from NGC 1898 formed [22]  shortly after ancient encounter [23] s with the
Small Magellanic Cloud [24]  (SMC) and our Milky Way Galaxy.

        Space Telescope Live: Where is Hubble looking right now? [25]
                        Tomorrow's picture: open space

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    Authors & editors: Robert Nemiroff [37] (MTU [38] ) & Jerry Bonnell [39]
                                  (UMCP [40] )
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              A service of: ASD [43]  at NASA [44]  / GSFC [45]
                           & Michigan Tech. U. [46]
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Site notes:
  [1] archivepix.html
  [2] image/1810/NGC1898_Hubble_2913.jpg
  [3] http://www.esa.int/
  [4] https://www.nasa.gov/mission_pages/hubble/mai...
  [5] https://www.nasa.gov/
  [6] https://www.youtube.com/watch?v=QuOJVc3KtaI
  [7] https://www.nasa.gov/mission_pages/hubble/sto...
  [8] https://solarsystem.nasa.gov/solar-system/sun...
  [9] ap070325.html
  [10] http://chandra.harvard.edu/photo/cosmic_dista...
  [11] https://www.spacetelescope.org/images/potw184...
  [12] https://en.wikipedia.org/wiki/Globular_cluste...
  [13] ap180516.html
  [14] ap180428.html
  [15] https://en.wikipedia.org/wiki/Satellite_galax...
  [16] http://www.atlasoftheuniverse.com/milkyway.ht...
  [17] https://www.spacetelescope.org/images/potw184...
  [18] https://science.nasa.gov/ems/07_infraredwaves
  [19] https://science.nasa.gov/ems/10_ultravioletwa...
  [20] https://archive.stsci.edu/proposal_search.php...
  [21] http://adsabs.harvard.edu/abs/2012A%26ARv..20...
  [22] http://adsabs.harvard.edu/abs/2012MNRAS.426.1...
  [23] ap160725.html
  [24] ap100903.html
  [25] http://spacetelescopelive.org/
  [26] ap181002.html
  [27] archivepix.html
  [28] lib/apsubmit2015.html
  [29] lib/aptree.html
  [30] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
  [31] calendar/allyears.html
  [32] /apod.rss
  [33] lib/edlinks.html
  [34] lib/about_apod.html
  [35] http://asterisk.apod.com/discuss_apod.php?dat...
  [36] ap181004.html
  [37] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [38] http://www.phy.mtu.edu/
  [39] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
  [40] http://www.astro.umd.edu/
  [41] lib/about_apod.html#srapply
  [42] https://www.nasa.gov/about/highlights/HP_Priv...
  [43] https://astrophysics.gsfc.nasa.gov/
  [44] https://www.nasa.gov/
  [45] https://www.nasa.gov/centers/goddard/
  [46] http://www.mtu.edu/

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