The University of Arizona offers many unique and fascinating resources for free online, and the High Resolution Imaging Science Experiment (HiRISE) website is one of them.
HiRISE (High Resolution Imaging Science Experiment) is the most powerful camera ever sent to another planet, one of six instruments onboard the Mars Reconnaissance Orbiter. We launched in 2005, arrived at Mars in 2006 and have been imaging ever since. Our camera’s high resolution capability (imaging up to 30 centimeters per pixel) remains unprecedented for any existing orbiter in the study of the Red Planet, as well as being an indispensable instrument for helping to select landing sites for robotic and future human exploration. In the past decade, we’ve also imaged avalanches in progress, and discovered dark flows that may or may not be briny seeps. Hundreds of science papers have been published with our data.