            APOD: 2018 July 18 - Dark Slope Streaks Split on Mars

                         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 July 18
                                      [2]
                      Dark Slope Streaks Split on Mars
     Image Credit: HiRISE [3] , MRO [4] , LPL (U. Arizona) [5] , NASA [6]

Explanation: What is creating these dark streaks on Mars? No one is sure.
Candidates include dust avalanches, evaporating dry ice [7] sleds [8] , and
liquid water flows. What is clear is that the streaks [9]  occur through light
surface dust and expose a deeper dark layer. Similar [10] streaks [11]  have
been photographed on Mars [12] for years and are one of the few surface
features that change their appearance seasonally [13] . Particularly
interesting here is that larger streaks split into smaller streaks further
down the slope. The featured image [14]  was taken by the HiRISE camera [15]
on board the Mars-orbiting Mars Reconnaissance Orbiter [16]  (MRO) several
months ago. Currently, a global [17] dust [18] storm [19]  is encompassing
much of Mars.

                      Tomorrow's picture: open space [20]

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    Authors & editors: Robert Nemiroff [32] (MTU [33] ) & Jerry Bonnell [34]
                                  (UMCP [35] )
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                           & Michigan Tech. U. [41]
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Site notes:
  [1] archivepix.html
  [2] image/1807/MarsSlopeStreaks_MRO_3199.jpg
  [3] http://hirise.lpl.arizona.edu/
  [4] http://mars.jpl.nasa.gov/mro/
  [5] http://www.lpl.arizona.edu/
  [6] https://www.nasa.gov/
  [7] ap110926.html
  [8] ap130617.html
  [9] https://en.wikipedia.org/wiki/Dark_slope_streak
  [10] ap100301.html
  [11] ap110808.html
  [12] https://solarsystem.nasa.gov/planets/mars/in-depth/
  [13] ap150930.html
  [14] https://photojournal.jpl.nasa.gov/catalog/PIA22240
  [15] https://www.uahirise.org/epo/about/
  [16]
https://www.nasa.gov/feature/jpl/
mars-reconnaissance-orbiter-preparing-for-years-ahead
  [17] ap180617.html
  [18] ap180616.html
  [19] ap180623.html
  [20] ap180719.html
  [21] ap180717.html
  [22] archivepix.html
  [23] lib/apsubmit2015.html
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  [26] calendar/allyears.html
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  [30] http://asterisk.apod.com/discuss_apod.php?date=180718
  [31] ap180719.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
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