Subj : Daily APOD Report To : All From : Ben Ritchey Date : Mon Jun 03 2019 10:10:58 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 ------------------------------------------------------------------------------- < [20] | Archive [21] | Submissions [22] | Index [23] | Search [24] | Calendar [25] | RSS [26] | Education [27] | About APOD [28] | Discuss [29] | > [30] ------------------------------------------------------------------------------- Authors & editors: Robert Nemiroff [31] (MTU [32] ) & Jerry Bonnell [33] (UMCP [34] ) NASA Official: Phillip Newman Specific rights apply [35] . NASA Web Privacy Policy and Important Notices [36] A service of: ASD [37] at NASA [38] / GSFC [39] & Michigan Tech. U. [40] ---------- 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 [36] https://www.nasa.gov/about/highlights/HP_Privacy.html [37] https://astrophysics.gsfc.nasa.gov/ [38] https://www.nasa.gov/ [39] https://www.nasa.gov/centers/goddard/ [40] http://www.mtu.edu/ --- Mystic BBS v1.12 A43 (Windows/32) * Origin: FIDONet - The Positronium Repository (1:393/68) .