HiRISE: High Resolution Imaging Science Experiment http://uahirise.org Image updates from the HiRISE camera onboard the Mars Reconnaissance Orbiter (MRO/NASA) en-us editor@uahirise.org (Ari) Wed, 18 May 2016 11:30:00 MST Bedrock Exposures on the Floor of Bakhuysen Craterhttp://uahirise.org/ESP_044981_1560This image shows an exposure of bedrock on the floor of Bakhuysen Crater, a 150-kilometer diameter impact crater in Noachis Terra.On the Shape of Impact Cratershttp://uahirise.org/ESP_044998_1745The shape of a crater can depend on factors including the angle of impact and the pre-impact slope and topography. Valley Networks in the Ancient Martian Highlandshttp://uahirise.org/ESP_045299_1545The valley networks on Mars are terrains eroded by flowing water billions of years ago. Frosted Duneshttp://uahirise.org/ESP_045311_1205Sand dunes cover much of this terrain, which has large boulders lying on flat areas between the dunes. HiClips: 18 May 2016 http://www.uahirise.org/media/ Narrated videos for our captioned image release.