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

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    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/

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