Old Basin Filled by Smooth Plains

This image, from NASA Mariner 10 spacecraft which launched in 1974, shows an old basin hummocky rim is partly degraded and cratered by later events.

This image, from NASA Mariner 10 spacecraft which launched in 1974, shows an old basin hummocky rim is partly degraded and cratered by later events.

MercuryMariner Venus Mercury Mariner 10