Tags: space, image, mercury, gravitational, anomalies, shown, false-color, superposed, planets, cratered, surface, hues, indicate, slightly, gravity, indicates, unusually, dense, matter
Tags: space, ancient, cratered, southern, highlands, mars, faint, traces, past, seen, form, fluidised, debris, craters, blocks, eroded, sediments
Tags: space, cratered, surface, charon