Subj : Daily APOD Report To : All From : Ben Ritchey Date : Mon May 20 2019 08:36:32 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 May 20 Planets of the Solar System: Tilts and Spins Video Credit: NASA [2] , Animation: James O'Donoghue [3] (JAXA [4] ) Explanation: How does your favorite planet spin? Does it spin rapidly around a nearly vertical axis, or horizontally, or backwards? The featured video [5] animates NASA [6] images of all eight planets [7] in our Solar System [8] to show them spinning side-by-side [9] for an easy comparison. In the time-lapse video [10] , a day on Earth -- one Earth rotation -- takes just a few seconds. Jupiter [11] rotates the fastest, while Venus [12] spins not only the slowest (can you see it?), but backwards. The inner rocky planets, across the top, most certainly underwent dramatic spin-altering collisions [13] during the early days of the Solar System. The reasons why planets spin and tilt [14] as they do remains a topic of research [15] with much insight gained from modern computer modeling [16] and the recent discovery and analysis of hundreds of exoplanets [17] : planets orbiting other stars [18] . Tomorrow's picture: sagittarian reds and blues ------------------------------------------------------------------------------- < [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] https://www.nasa.gov/ [3] https://twitter.com/physicsJ [4] http://global.jaxa.jp/ [5] https://www.youtube.com/watch?v=MS8KA7Mayho [6] https://www.nasa.gov/ [7] ap060828.html [8] https://solarsystem.nasa.gov/solar-system/our-solar-system/in-depth/ [9] https://www.youtube.com/watch?v=plpvWGOAL4o [10] https://www.youtube.com/embed/my1euFQHH-o [11] https://solarsystem.nasa.gov/planets/jupiter/overview/ [12] https://solarsystem.nasa.gov/planets/venus/overview/ [13] https://mobile.arc.nasa.gov/public/iexplore/missions/pages/yss/june.html [14] https://geekologie.com/2019/01/a-simple-animation-of-the-tilt-and-rotat.php [15] http://allwallps.com/bin/02/54/72a.jpg [16] http://adsabs.harvard.edu/abs/2001Natur.411..767C [17] https://exoplanets.nasa.gov/ [18] ap151205.html [19] ap190519.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=190520 [29] ap190521.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 A43 (Windows/32) * Origin: FIDONet - The Positronium Repository (1:393/68) .