HiRISE: High Resolution Imaging Science Experiment http://hirise.lpl.arizona.edu Weekly image updates from the HiRISE Camera onboard the Mars Reconnaissance Orbiter en-us webmaster@pirl.lpl.arizona.edu (The Guys at HiRISE) Wed, 7 May 2008 20:00:00 GMT Rayed Crater in Tharsis Regionhttp://hirise.lpl.arizona.edu/PSP_008011_1975In addition to fine material, large boulders are visible in the rays surrounding this crater.Lava Stratigraphy in the Flanks of Olympus Monshttp://hirise.lpl.arizona.edu/PSP_007946_2035This scarp was most likely produced by massive landslides as the volcano falls apart under its own weight.Eroded Crater Slopes in Ancient Noachis Regionhttp://hirise.lpl.arizona.edu/PSP_007808_1575Valley networks often appear on the most ancient terrains, suggesting a very different world more than 3 billion years ago.Changing Frost Patterns in Louth Craterhttp://hirise.lpl.arizona.edu/PSP_007805_2505This crater contains a mound covered by water frost that persists throughout the year, which is unusual for this latitude.Jointed Rocks Near Nilosyrtis Mensaehttp://hirise.lpl.arizona.edu/PSP_007701_2095An interesting aspect of the rocks at the edge of the pit is the widespread fracturing.Frosted Crater Near Mars’ North Polehttp://hirise.lpl.arizona.edu/PSP_007673_2575Ice on Mars does not melt in the current climate, but it does expand and contract with temperature variations.Layered Rock in Noctis Labyrinthushttp://hirise.lpl.arizona.edu/PSP_006745_1715These layers might be the same as those seen in the canyons of Valles Marineris; their origin is currently unresolved.Mantled Craters in Terra Cimmeriahttp://hirise.lpl.arizona.edu/PSP_006736_1325The two craters are covered in a mantling material, which gives them a smooth appearance.