MARTIAN GROOVES

By the beginning of the 21st century, the Mars Reconnaissance Orbiter boasted a camera capable of imaging objects only a few meters across, revealing the diversity of Martian gullies. This crater, roughly seven kilometers across, features both rectilinear crater-wall troughs and sinuous grooves in the floor.

Explanations include erosion from seepage, melting of ground ice, or dry landslides.