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 March 25
                                      [2]
                        Arp 194: Merging Galaxy Group
  Image Credit: NASA [3] , ESA [4] , Hubble [5] ; Processing & License [6] :
                               Judy Schmidt [7]

Explanation: Why are stars forming in the bridge between these colliding
galaxies? Usually when galaxies crash [8] , star formation is confined to
galaxy disks or tidal tail [9] s. In Arp 194 [10] , though, there are bright
knots of young stars right in a connecting bridge. Analyses of images and data
including the featured image [11]  of Arp 194 from Hubble [12] , as well as
computer simulations [13]  of the interaction, indicate that the bottom galaxy
pass [14] ed right through the top galaxy within the past 100 million years.
The result [15]  has left a stream of gas that is now falling toward the
bottom galaxy. Astronomers hypothesize [16]  that stars form in this bridge
because of [17]  the recent fading of turbulence after the rapid collision. In
about a billion years [18] , the galaxies -- including a smaller galaxy
superposed on the upper galaxy (see it?) -- will all merge into one larger
galaxy [19] .

                       Tomorrow's picture: flaming star

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    Authors & editors: Robert Nemiroff [31] (MTU [32] ) & Jerry Bonnell [33]
                                  (UMCP [34] )
          NASA Official:  Phillip Newman Specific rights apply [35] .
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              A service of: ASD [37]  at NASA [38]  / GSFC [39]
                           & Michigan Tech. U. [40]
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Site notes:
  [1] archivepix.html
  [2] image/1903/Arp194_HubbleSchmidt_1494.jpg
  [3] https://www.nasa.gov/
  [4] http://www.esa.int/
  [5] https://www.nasa.gov/mission_pages/hubble/mai...
  [6] https://creativecommons.org/licenses/by/2.0/
  [7] http://geckzilla.com/
  [8] ap150201.html
  [9] ap181211.html
  [10] http://hubblesite.org/video/615/news_release/...
  [11] https://www.flickr.com/photos/geckzilla/26654...
  [12] https://www.nasa.gov/mission_pages/hubble/sto...
  [13] ap130514.html
  [14] https://svs.gsfc.nasa.gov/11534
  [15] http://adsabs.harvard.edu/abs/2003AJ....125.1...
  [16] https://cdn140.picsart.com/244538806029212.pn...
  [17] http://adsabs.harvard.edu/abs/2016MNRAS.462.3...
  [18] http://www.chronozoom.com/#/t00000000-0000-00...
  [19] ap120604.html
  [20] ap190324.html
  [21] archivepix.html
  [22] lib/apsubmit2015.html
  [23] lib/aptree.html
  [24] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
  [25] calendar/allyears.html
  [26] /apod.rss
  [27] lib/edlinks.html
  [28] lib/about_apod.html
  [29] http://asterisk.apod.com/discuss_apod.php?dat...
  [30] ap190326.html
  [31] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [32] http://www.phy.mtu.edu/
  [33] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
  [34] http://www.astro.umd.edu/
  [35] lib/about_apod.html#srapply
  [36] https://www.nasa.gov/about/highlights/HP_Priv...
  [37] https://astrophysics.gsfc.nasa.gov/
  [38] https://www.nasa.gov/
  [39] https://www.nasa.gov/centers/goddard/
  [40] http://www.mtu.edu/

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