MARS RECONNAISSANCE ORBITER HIRISE IMAGES April 30, 2008 o Ejecta Blanket of an Impact Crater http://hirise.lpl.arizona.edu/PSP_007822_1415 o Defrosting Dunes in the North Polar Sand Sea http://hirise.lpl.arizona.edu/PSP_007801_2610 o Segment of a Crater Ray http://hirise.lpl.arizona.edu/PSP_007751_1640 o Exposed Layers in Crater Wall Near Mawrth Vallis http://hirise.lpl.arizona.edu/PSP_007744_2055 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 t he University of Arizona. Ball Aerospace and Technologies Corp., of Boulder, Colo., built the HiRISE instrument.