This low-angle self-portrait of NASA’s Curiosity Mars rover shows the vehicle at the site from which it reached down to drill into a rock target called “Buckskin” on lower Mount Sharp.

NASA's Curiosity rover snapped this view of polygon-patterned bedrock on May 4. Mars is home to a lot of odd-shaped rocks that can look pretty random. Patterns, however, can catch scientists’ eyes.

A rocky Martian feature, which resembles a crumbling street curb, is part of a boxwork pattern that stretches for miles in a section of Gale Crater that NASA's Curiosity rover is now exploring. Credit ...