Subj : Daily APOD Report To : All From : Ben Ritchey Date : Fri Aug 31 2018 02:58:57 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 August 5 [2] Trapezium: At the Heart of Orion Image Credit: Data: Hubble Legacy Archive [3] , Processing: Robert Gendler [4] Explanation: Near the center of this sharp cosmic portrait [5] , at the heart of the Orion Nebula [6] , are four hot, massive stars known as the Trapezium [7] . Gathered within a region about 1.5 light-years in radius, they dominate the core of the dense Orion Nebula Star Cluster. Ultraviolet [8] ionizing radiation from the Trapezium stars [9] , mostly from the brightest star Theta-1 Orionis C [10] powers the complex star forming region's entire visible glow. About three million years old, the Orion Nebula Cluster was even more compact in its younger years and a recent dynamical study [11] indicates that runaway stellar collisions [12] at an earlier age may have formed a black hole with more than 100 times the mass of the Sun [13] . The presence of a black hole [14] within the cluster could explain the observed high velocities of the Trapezium stars [15] . The Orion Nebula's distance of some 1,500 light-years [16] would make it the closest known black hole [17] to planet Earth. APOD Event: APOD Editor to speak at Fermilab on August 8 [18] Tomorrow's picture: cosmic streaks ------------------------------------------------------------------------------- < [19] | Archive [20] | Submissions [21] | Index [22] | Search [23] | Calendar [24] | RSS [25] | Education [26] | About APOD [27] | Discuss [28] | > [29] ------------------------------------------------------------------------------- Authors & editors: Robert Nemiroff [30] (MTU [31] ) & Jerry Bonnell [32] (UMCP [33] ) NASA Official: Phillip Newman Specific rights apply [34] . NASA Web Privacy Policy and Important Notices [35] A service of: ASD [36] at NASA [37] / GSFC [38] & Michigan Tech. U. [39] ---------- Site notes: [1] archivepix.html [2] image/1808/OrionTrapezium_HubbleGendler_4000.jpg [3] http://hla.stsci.edu/ [4] http://www.robgendlerastropics.com/ [5] http://www.robgendlerastropics.com/ TrapMosaic-HST-Gendler.html [6] ap090222.html [7] http://messier.seds.org/more/m042_trapezium.html [8] https://science.nasa.gov/ems/10_ultravioletwaves [9] https://en.wikipedia.org/wiki/Trapezium_Cluster [10] http://stars.astro.illinois.edu/sow/theta1ori.html [11] http://adsabs.harvard.edu/abs/2012ApJ...757...37S [12] http://www.skyandtelescope.com/community/skyblog/newsblog/ A-Black-Hole-in-Orion-171183711.html [13] https://solarsystem.nasa.gov/solar-system/sun/in-depth/ [14] ap141026.html [15] ap170321.html [16] https://starchild.gsfc.nasa.gov/docs/StarChild/questions/question19.html [17] https://en.wikipedia.org/wiki/List_of_nearest_black_holes [18] https://www.facebook.com/events/224564531505324/ [19] ap180804.html [20] archivepix.html [21] lib/apsubmit2015.html [22] lib/aptree.html [23] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search [24] calendar/allyears.html [25] /apod.rss [26] lib/edlinks.html [27] lib/about_apod.html [28] http://asterisk.apod.com/discuss_apod.php?date=180805 [29] ap180806.html [30] http://www.phy.mtu.edu/faculty/Nemiroff.html [31] http://www.phy.mtu.edu/ [32] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html [33] http://www.astro.umd.edu/ [34] lib/about_apod.html#srapply [35] https://www.nasa.gov/about/highlights/HP_Privacy.html [36] https://astrophysics.gsfc.nasa.gov/ [37] https://www.nasa.gov/ [38] https://www.nasa.gov/centers/goddard/ [39] http://www.mtu.edu/ --- Mystic BBS v1.12 A39 (Windows/32) * Origin: FIDONet - The Positronium Repository (1:393/68) .