Today's Image of Mars shows defrosting dunes and gullies during late summer in Mars' southern hemisphere. Mars Reconnaissance Orbiter's HiRISE monitors defrosting sites in hopes of learning about the defrosting process on Mars. It might sound mundane, but this knowledge may one day help explorers survive by helping them to follow one of the many gullies on Mars to its source. One of the primary needs of explorers will be water and being able to find it if no satellite coverage is available could mean the difference between life and death.
Clicking on this image will take you to the original captioned image from HiRISE.