From Newsgroup: sci.space.news
MARS RECONNAISSANCE ORBITER HIRISE IMAGES
December 21, 2016
o Lace on Mars
http://www.uahirise.org/ESP_046414_0990
Channels formed by sublimation of a layer of seasonal dry ice are so
dense in this area that they look like lace.
o Spiders on Mounds
http://www.uahirise.org/ESP_046562_1005
This landform is uniquely Martian, formed in the spring as seasonal
dry ice turns directly into gas.
o Secondary Craters
http://www.uahirise.org/ESP_046876_1465
Secondary impact craters are both interesting and vexing, but can be
used to constrain the age of the surface where they fell.
o Soffen Crater Floor
http://www.uahirise.org/ESP_047561_1560
This crater on Mars was named after Dr. Gerald A. Soffen, project
scientist for NASA's Viking program for Mars landers.
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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