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 June 3
                                      [2]
                        Stephan's Quintet from Hubble
 Image Credit: NASA [3] , ESA [4] , Hubble [5] ; Processing: Daniel Nobre [6]

Explanation: When did these big galaxies first begin to dance? Really only
four of the five of Stephan's Quintet [7]  are locked in a cosmic tango of
repeated close encounters taking place some 300 million light-years [8]  away.
The odd galaxy out is easy to spot in this recently reprocessed image [9]  by
the Hubble Space Telescope [10]  -- the interacting galaxies [11] , NGC 7319,
7318B, 7318A, and 7317 (left to right), have a more dominant yellowish cast.
They also tend to have distorted loops [12]  and tails [13] , grown under the
influence of disruptive gravitational tides [14] . The mostly bluish galaxy,
large NGC 7320 on the lower left, is in the foreground at about 40 million
light-years distant, and so is not part of the interacting group [15] . Data
and modeling indicate that NGC 7318B is a relatively new intruder. A
recently-discovered halo [16]  of old red stars surrounding Stephan's Quintet
[17]  indicate that at least some of these galaxies started tangling over a
billion years. Stephan's Quintet [18]  is visible with a moderate
sized-telescope toward the constellation of Winged Horse (Pegasus [19] ).

                    Tomorrow's picture: listening to mars

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    Authors & editors: Robert Nemiroff [31] (MTU [32] ) & Jerry Bonnell [33]
                                  (UMCP [34] )
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Site notes:
  [1] archivepix.html
  [2] image/1906/StephansQuintet_HubbleNobre_1824.jpg
  [3] https://www.nasa.gov/
  [4] https://www.esa.int/
  [5] https://www.nasa.gov/mission_pages/hubble/story/index.html
  [6] https://www.astrobin.com/users/Deep_Sky/
  [7] https://en.wikipedia.org/wiki/Stephan%27s_Quintet
  [8]
https://www.grc.nasa.gov/WWW/k-12/Numbers/Math/Mathematical_Thinking/
how_long_is_a_light_year.htm
  [9] https://www.astrobin.com/407371/B/?nc=user
  [10] ap010806.html
  [11] http://adsabs.harvard.edu/abs/2001AJ....122.2993S
  [12] ap130416.html
  [13] ap181211.html
  [14] ap130514.html
  [15] https://www.youtube.com/watch?v=BgIgKcqPd4k
  [16] http://cfht.hawaii.edu/en/news/StephansQuintetLSB/
  [17] https://www.nature.com/articles/s41550-018-0415-2
  [18] http://hubblesite.org/image/3848/printshop
  [19] https://en.wikipedia.org/wiki/Pegasus_(constellation)
  [20] ap190602.html
  [21] archivepix.html
  [22] lib/apsubmit2015.html
  [23] lib/aptree.html
  [24] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [25] calendar/allyears.html
  [26] /apod.rss
  [27] lib/edlinks.html
  [28] lib/about_apod.html
  [29] http://asterisk.apod.com/discuss_apod.php?date=190603
  [30] ap190604.html
  [31] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [32] http://www.phy.mtu.edu/
  [33] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [34] http://www.astro.umd.edu/
  [35] lib/about_apod.html#srapply
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