This image of the Cornelia Crater on Vesta shows lobate deposits (right) and curvilinear gullies (highlighted by the short white arrows, left). According to a newly published paper in The Planetary Science Journal, ice underneath the surface of an airless world could be excavated and melted by an impact, such as from a meteoroid impact, and then flow along the walls of the impact crater as liquid brines to form these distinct surface features.