Slope monitoring. The recurring slope lineae (RSL) in this image are large and have high contrast. Most importantly, we see multiple examples of RSL flowing on bedrock, alternating between bedrock and regolith and bedrock and regolith, and regolith only. Do these candidate RSL fade? Do only the regolith RSL fade? Do they all lengthen?
HiRISE Picture of the Day archive. [More at links]