Smooth Volcanic Plains

This image, from NASA Mariner 10 spacecraft which launched in 1974, shows plains filling this basin are uniformly brighter and slightly redder than the surrounding cratered terrain.

This image, from NASA Mariner 10 spacecraft which launched in 1974, shows plains filling this basin are uniformly brighter and slightly redder than the surrounding cratered terrain.

MercuryMariner Venus Mercury Mariner 10