HiRISE: High Resolution Imaging Science Experiment http://uahirise.org Image updates from the HiRISE camera onboard the Mars Reconnaissance Orbiter (NASA) en-us editor@uahirise.org (Ari) Wed, 27 Jan 2016 15:00:00 MST Pit Crater near Elysium Monshttp://uahirise.org/ESP_043222_2035Pit craters are simply sink holes in the ground with near vertical walls and floors that are only visible when the sun is high in the sky. A Tale of Two Flowshttp://uahirise.org/ESP_043609_2230We will need to study this image in more detail to understand how these flows have interacted with each other and what they can tell us about their composition. The Changing Sandshttp://uahirise.org/ESP_043617_1885These barchan dunes have been imaged at least five times already, and each time, a bit more movement is revealed.Jarosite in Noctis Labyrinthushttp://uahirise.org/ESP_043719_1725The jarosite-bearing deposit observed here could indicate acidic aqueous conditions within a volcanic system in Noctis Labyrinthus. HiClips: 27 January 2016 http://www.uahirise.org/media/ Narrated videos for our captioned image release.