Subj : Daily APOD Report To : All From : Ben Ritchey Date : Tue Jun 04 2019 08:54:05 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 June 4 [2] SEIS: Listening for Marsquakes Image Credit: NASA [3] , JPL-Caltech [4] , Mars Insight [5] Explanation: If you put your ear to Mars, what would you hear? To find out, and to explore the unknown interior of Mars [6] , NASA's Insight Lander [7] deployed [8] SEIS [9] late last year, a sensitive seismometer [10] that can detect marsquakes. In early April, after hearing the wind and motions initiated by the lander itself, SEIS recorded an unprecedented event [11] that matches what was expected for a marsquake [12] . This event can be heard on this YouTube video [13] . Although Mars is not thought to have tectonic plates [14] like the Earth, numerous faults are visible on the Martian surface which likely occurred as the hot interior of Mars cooled -- and continues to cool [15] . Were strong enough marsquakes [16] to occur, SEIS [17] could hear their rumbles reflected from large structures internal to Mars, like a liquid core [18] , if one exists. Pictured last week [19] , SEIS sits quietly [20] on the Martian surface, taking in some Sun [21] while light clouds [22] are visible over the horizon. Create a Distant Legacy: Send your name to Mars [23] Tomorrow's picture: interstellar orion ------------------------------------------------------------------------------- < [24] | Archive [25] | Submissions [26] | Index [27] | Search [28] | Calendar [29] | RSS [30] | Education [31] | About APOD [32] | Discuss [33] | > [34] ------------------------------------------------------------------------------- Authors & editors: Robert Nemiroff [35] (MTU [36] ) & Jerry Bonnell [37] (UMCP [38] ) NASA Official: Phillip Newman Specific rights apply [39] . NASA Web Privacy Policy and Important Notices [40] A service of: ASD [41] at NASA [42] / GSFC [43] & Michigan Tech. U. [44] ---------- Site notes: [1] archivepix.html [2] image/1906/SeismometerClouds_Insight_1021.jpg [3] https://www.nasa.gov [4] https://www.jpl.nasa.gov/ [5] https://mars.nasa.gov/insight/ [6] https://solarsystem.nasa.gov/planets/mars/overview/ [7] https://mars.nasa.gov/insight/spacecraft/about-the-lander/ [8] ap181210.html [9] https://mars.nasa.gov/insight/spacecraft/instruments/seis/ [10] https://www.seis-insight.eu/en/public-2/planetary-seismology/ how-a-seismometer-works [11] https://www.nasa.gov/press-release/ nasa-s-insight-lander-captures-audio-of-first-likely-quake-on-mars [12] http://www.planetary.org/blogs/emily-lakdawalla/2019/ insight-detects-marsquake.html [13] https://youtu.be/DLBP-5KoSCc [14] https://svs.gsfc.nasa.gov/2953 [15] https://twitter.com/nasainsight [16] https://www.seis-insight.eu/en/public-2/martian-science/is-there-marsquake [17] https://en.wikipedia.org/wiki/Seismic_Experiment_for_Interior_Structure [18] https://www.newscientist.com/article/ dn11962-lab-study-indicates-mars-has-a-molten-core/ [19] https://mars.nasa.gov/raw_images/10747/?site=insight [20] https://photojournal.jpl.nasa.gov/catalog/PIA23180 [21] https://www.luvbat.com/uploads/kitten_napping_on_a_sun-bed_5920828459.jpg [22] ap010417.html [23] https://mars.nasa.gov/participate/send-your-name/ [24] ap190603.html [25] archivepix.html [26] lib/apsubmit2015.html [27] lib/aptree.html [28] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search [29] calendar/allyears.html [30] /apod.rss [31] lib/edlinks.html [32] lib/about_apod.html [33] http://asterisk.apod.com/discuss_apod.php?date=190604 [34] ap190605.html [35] http://www.phy.mtu.edu/faculty/Nemiroff.html [36] http://www.phy.mtu.edu/ [37] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html [38] http://www.astro.umd.edu/ [39] lib/about_apod.html#srapply [40] https://www.nasa.gov/about/highlights/HP_Privacy.html [41] https://astrophysics.gsfc.nasa.gov/ [42] https://www.nasa.gov/ [43] https://www.nasa.gov/centers/goddard/ [44] http://www.mtu.edu/ --- Mystic BBS v1.12 A43 (Windows/32) * Origin: FIDONet - The Positronium Repository (1:393/68) .