Subj : Daily APOD Report To : All From : Ben Ritchey Date : Sun Oct 28 2018 10:42:53 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 October 28 [2] Ultraviolet Earth from an Observatory on the Moon Image Credit: G. Carruthers [3] (NRL [4] ) et al., Far UV Camera [5] , Apollo 16 [6] , NASA [7] Explanation: Which planet is this? Earth [8] . The featured [9] false color picture [10] shows how the Earth shines in ultraviolet [11] (UV) light. The image is historic because it was taken from the surface of the Moon [12] by humanity's first lunar observatory [13] . (Another is operating now [14] .) Although very little UV light [15] is transmitted through the Earth's atmosphere, what sunlight does make it through might cause a sunburn [16] . The part of the Earth facing the Sun [17] reflects much UV light, but perhaps more interesting is the side facing away from the Sun. Here bands of UV emission [18] are the result of auroras [19] and are caused by charged particles [20] expelled by the Sun. Other planets showing auroras in the UV include Mars [21] , Saturn [22] , Jupiter [23] , and Uranus [24] . Tomorrow's picture: shelled galaxy ------------------------------------------------------------------------------- < [25] | Archive [26] | Submissions [27] | Index [28] | Search [29] | Calendar [30] | RSS [31] | Education [32] | About APOD [33] | Discuss [34] | > [35] ------------------------------------------------------------------------------- Authors & editors: Robert Nemiroff [36] (MTU [37] ) & Jerry Bonnell [38] (UMCP [39] ) NASA Official: Phillip Newman Specific rights apply [40] . NASA Web Privacy Policy and Important Notices [41] A service of: ASD [42] at NASA [43] / GSFC [44] & Michigan Tech. U. [45] ---------- Site notes: [1] archivepix.html [2] image/1810/EarthUV_Apollo16_1719.jpg [3] https://en.wikipedia.org/wiki/George_Robert_Carruthers [4] https://www.nrl.navy.mil/ [5] https://www.nasa.gov/image-feature/ looking-back-dr-george-carruthers-and-apollo-16-far-ultraviolet- cameraspectrograph [6] https://www.nasa.gov/mission_pages/apollo/missions/apollo16.html [7] https://www.nasa.gov/ [8] https://solarsystem.nasa.gov/planets/earth/overview/ [9] https://spaceflight.nasa.gov/gallery/images/apollo/apollo16/hires/s72-40821.jpg [10] https://commons.wikimedia.org/wiki/ File:Earth_in_ultraviolet_from_the_Moon_(S72-40821).jpg [11] https://science.nasa.gov/ems/10_ultravioletwaves [12] https://www.forbes.com/sites/startswithabang/2018/10/25/ why-dont-we-put-a-space-telescope-on-the-moon/ [13] https://www.nasa.gov/image-feature/ looking-back-dr-george-carruthers-and-apollo-16-far-ultraviolet- cameraspectrograph [14] http://english.nao.cas.cn/Research2015/rp2015/201701/t20170120_173602.html [15] https://en.wikipedia.org/wiki/Ultraviolet [16] https://en.wikipedia.org/wiki/Sunburn [17] https://solarsystem.nasa.gov/solar-system/sun/overview/ [18] http://solar-center.stanford.edu/about/uvlight.html [19] ap171210.html [20] http://www-spof.gsfc.nasa.gov/Education/Intro.html [21] ap171006.html [22] ap180903.html [23] ap160711.html [24] https://www.nasa.gov/image-feature/goddard/2017/hubble-spots-auroras-on-uranus [25] ap181027.html [26] archivepix.html [27] lib/apsubmit2015.html [28] lib/aptree.html [29] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search [30] calendar/allyears.html [31] /apod.rss [32] lib/edlinks.html [33] lib/about_apod.html [34] http://asterisk.apod.com/discuss_apod.php?date=181028 [35] ap181029.html [36] http://www.phy.mtu.edu/faculty/Nemiroff.html [37] http://www.phy.mtu.edu/ [38] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html [39] http://www.astro.umd.edu/ [40] lib/about_apod.html#srapply [41] https://www.nasa.gov/about/highlights/HP_Privacy.html [42] https://astrophysics.gsfc.nasa.gov/ [43] https://www.nasa.gov/ [44] https://www.nasa.gov/centers/goddard/ [45] http://www.mtu.edu/ --- Mystic BBS v1.12 A39 (Windows/32) * Origin: FIDONet - The Positronium Repository (1:393/68) .