From Newsgroup: sci.space.news
MARS RECONNAISSANCE ORBITER HIRISE IMAGES
February 24, 2016
o Summer Sand Dunes.
http://hirise.lpl.arizona.edu/ESP_044088_2640
In the winter and spring, the dunes are covered by a
seasonal cap of dry ice.
o Colorful Hargraves .
http://hirise.lpl.arizona.edu/ESP_044161_2005
This image is in a region that hosts many proposed future
Mars landing sites.
o Dramatic Shadows over a Fossil Glacier.
http://hirise.lpl.arizona.edu/ESP_044193_1430
This image was acquired near the Martian winter solstice, when
the sun was low over the horizon at this location.
o Frosted Gully Slopes in Shadows.
http://hirise.lpl.arizona.edu/ESP_044327_1375
At first glance, this image looks like a mistake because the
gullies of interest are entirely hidden in a large shadow
filling most of the crater.
All of the HiRISE images are archived here:
http://hirise.lpl.arizona.edu/
Information about the Mars Reconnaissance Orbiter is
online at
http://www.nasa.gov/mro. The mission is
managed by NASA's Jet Propulsion Laboratory, a division
of the California Institute of Technology, for the NASA
Science Mission Directorate, Washington, D.C. Lockheed
Martin Space Systems, of Denver, is the prime contractor
and built the spacecraft. HiRISE is operated by the
University of Arizona. Ball Aerospace and Technologies
Corp., of Boulder, Colo., built the HiRISE instrument.
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