This image shows a portion of Lethe Vallis, an outflow channel that also transported lava. The image was acquired at 15:16 local Mars time on May 6, 2016, by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter. Another investigation of this area (Balme et al., 2011) discovered a repeat pattern of dune-like forms in the channel interpreted as fluvial dunes (or, giant current ripples) which are dunes formed by flowing water. This is one of only a few places on Mars where these pristine-appearing landforms have been identified.  Happy #spaceSaturday folks! Credit: NASA #NASA #Mars #journeytoMars #planetary #science