Ridges and Fractures on Floor of Caloris Basin

This image, from NASA Mariner 10 spacecraft which launched in 1974, includes part of the floor of the Caloris basin showing the ridges and fractures.

This image, from NASA Mariner 10 spacecraft which launched in 1974, includes part of the floor of the Caloris basin showing the ridges and fractures.

MercuryMariner Venus Mercury Mariner 10