M. J. S. Belton G. E. Danielson M. E. Davies D. Gault B. Hapke B. O'Leary R.G. Strom V. Suomi N. Trask B. C. Murray 1974 Mercury has a heavily cratered surface containing basins up to at least 1300 kilometers diameter flooded with mare-like material. Many features are closely similar to those on the moon, but significant structural differences exist. Major chemical differentiation before termination of accretion is implied. application/pdf 10.1126/science.184.4135.459 en American Association for the Advancement of Science Mariner 10 pictures of Mercury: First results article