Subj : Daily APOD Report To : All From : Ben Ritchey Date : Sun Apr 28 2019 20:54:16 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 28 All of Mercury Image Credit: NASA [2] / JHU Applied Physics Lab [3] / Carnegie Inst. Washington [4] Explanation: Only six years ago, the entire surface [5] of planet Mercury was finally mapped. Detailed observations of the innermost planet [6] 's surprising crust began when the robotic have been ongoing since the robotic MESSENGER spacecraft [7] first passed Mercury in 2008 and continued until its controlled crash landing [8] in 2015. Previously, much of the Mercury's surface [9] was unknown as it is too far for Earth-bound telescopes to see clearly, while the Mariner 10 [10] flybys in the 1970s observed only about half. The featured video [11] is a compilation of thousands of images of Mercury [12] rendered in exaggerated colors [13] to better contrast different surface features. Visible on the rotating world [14] are rays emanating [15] from a northern impact that stretch across much of the planet, while about half-way through the video the light colored Caloris Basin [16] rotates into view, a northern ancient impact feature that filled with lava [17] . Recent analysis [18] of MESSENGER data indicates that Mercury has a solid inner core [19] . Surf the Universe: Click here to see a randomly selected APOD! [20] Tomorrow's picture: calibrated star cloud ------------------------------------------------------------------------------- < [21] | Archive [22] | Submissions [23] | Index [24] | Search [25] | Calendar [26] | RSS [27] | Education [28] | About APOD [29] | Discuss [30] | > [31] ------------------------------------------------------------------------------- Authors & editors: Robert Nemiroff [32] (MTU [33] ) & Jerry Bonnell [34] (UMCP [35] ) NASA Official: Phillip Newman Specific rights apply [36] . NASA Web Privacy Policy and Important Notices [37] A service of: ASD [38] at NASA [39] / GSFC [40] & Michigan Tech. U. [41] ---------- Site notes: [1] archivepix.html [2] https://www.nasa.gov/ [3] http://messenger.jhuapl.edu/ [4] https://www.ciw.edu/ [5] http://photojournal.jpl.nasa.gov/catalog/PIA17230 [6] https://solarsystem.nasa.gov/planets/mercury/overview/ [7] http://messenger.jhuapl.edu/the_mission/index.html [8] ap150501.html [9] ap080319.html [10] https://www.jpl.nasa.gov/missions/mariner-10/ [11] http://www.youtube.com/watch?v=DmYK479EpQc [12] https://en.wikipedia.org/wiki/Mercury_(planet) [13] ap130301.html [14] https://solarsystem.nasa.gov/planets/mercury/in-depth/ [15] ap081008.html [16] ap080710.html [17] https://www.youtube.com/watch?v=fmCJSS2YAP0 [18] https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018GL081135 [19] https://solarsystem.nasa.gov/news/908/ discovery-alert-a-closer-look-at-mercurys-spin-and-gravity-reveals-the-planets- inner-solid-core/ [20] random_apod.html [21] ap190427.html [22] archivepix.html [23] lib/apsubmit2015.html [24] lib/aptree.html [25] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search [26] calendar/allyears.html [27] /apod.rss [28] lib/edlinks.html [29] lib/about_apod.html [30] http://asterisk.apod.com/discuss_apod.php?date=190428 [31] ap190429.html [32] http://www.phy.mtu.edu/faculty/Nemiroff.html [33] http://www.phy.mtu.edu/ [34] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html [35] http://www.astro.umd.edu/ [36] lib/about_apod.html#srapply [37] https://www.nasa.gov/about/highlights/HP_Privacy.html [38] https://astrophysics.gsfc.nasa.gov/ [39] https://www.nasa.gov/ [40] https://www.nasa.gov/centers/goddard/ [41] http://www.mtu.edu/ --- Mystic BBS v1.12 A43 (Windows/32) * Origin: FIDONet - The Positronium Repository (1:393/68) .