Subj : Daily APOD Report To : All From : Ben Ritchey Date : Wed Apr 24 2019 00:11:04 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 April 24 [2] The Shape of the Southern Crab Image Credit: NASA [3] , ESA [4] , STScI [5] Explanation: The symmetric, multi-legged appearance [6] of the Southern Crab Nebula is certainly distinctive. About 7,000 light-years distant toward the southern sky constellation Centaurus, its glowing nested hourglass shapes are produced by the remarkable symbiotic binary star system at its center. The nebula's dramatic stellar duo [7] consists of a hot white dwarf star and cool, pulsating red giant star shedding outer layers that fall onto the smaller, much hotter companion. Embedded in a disk of material, outbursts from the white dwarf cause an outflow of gas driven away both above and below the disk resulting in the bipolar hourglass shapes [8] . The bright central shape is about half a light-year across. This new Hubble Space Telescope image [9] celebrates the 29th anniversary of Hubble's launch on April 24, 1990 on board the Space Shuttle Discovery [10] . Tomorrow's picture: pixels in space ------------------------------------------------------------------------------- < [11] | Archive [12] | Submissions [13] | Index [14] | Search [15] | Calendar [16] | RSS [17] | Education [18] | About APOD [19] | Discuss [20] | > [21] ------------------------------------------------------------------------------- Authors & editors: Robert Nemiroff [22] (MTU [23] ) & Jerry Bonnell [24] (UMCP [25] ) NASA Official: Phillip Newman Specific rights apply [26] . NASA Web Privacy Policy and Important Notices [27] A service of: ASD [28] at NASA [29] / GSFC [30] & Michigan Tech. U. [31] ---------- Site notes: [1] archivepix.html [2] image/1904/SouthernCrabHST_2100x2460.jpg [3] https://www.nasa.gov/ [4] https://www.esa.int/ [5] http://www.stsci.edu/ [6] http://hubblesite.org/image/4487/news_release/2019-15 [7] ap060722.html [8] https://arxiv.org/abs/1509.05448 [9] http://hubblesite.org/news_release/news/2019-15 [10] ap120419.html [11] ap190423.html [12] archivepix.html [13] lib/apsubmit2015.html [14] lib/aptree.html [15] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search [16] calendar/allyears.html [17] /apod.rss [18] lib/edlinks.html [19] lib/about_apod.html [20] http://asterisk.apod.com/discuss_apod.php?date=190424 [21] ap190425.html [22] http://www.phy.mtu.edu/faculty/Nemiroff.html [23] http://www.phy.mtu.edu/ [24] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html [25] http://www.astro.umd.edu/ [26] lib/about_apod.html#srapply [27] https://www.nasa.gov/about/highlights/HP_Privacy.html [28] https://astrophysics.gsfc.nasa.gov/ [29] https://www.nasa.gov/ [30] https://www.nasa.gov/centers/goddard/ [31] http://www.mtu.edu/ --- Mystic BBS v1.12 A43 (Windows/32) * Origin: FIDONet - The Positronium Repository (1:393/68) .