They say there are better maps of the moon and Mars than of Earth — some 70 percent of this planet’s surface is under water, and water disrupts radar signals needed to generate high-resolution maps. Most maps of the ocean floor have a resolution of 5 kilometers (3.1 miles), meaning only objects with about that diameter or larger are discernible.
Science writer and educator
October 3, 2017 — Much of what lay beneath the ship was a mystery. The edge of the continental shelf plummets more than 2 miles (3.2 kilometers) somewhere in the vicinity of oceanographer Robert Ballard’s Exploration Vessel (E/V) Nautilus, which was making its way to Cordell Bank National Marine Sanctuary, about 60 miles (97…