Once upon a time: a wetter, warmer Mars
Water roaring out of a overfilled lake carved an instant grand canyon - a valley more than 1.6 kilometers deep - existed on the surface of Mars some 3.5 billion years ago, according to a new analysis
Water roaring out of a overfilled lake carved an instant grand canyon - a valley more than 1.6 kilometers deep - existed on the surface of Mars some 3.5 billion years ago, according to a new analysis