The Great Crater Hokusai . ... Credit Copyright: NASA , Johns Hopkins Univ. ... CIW Explanation: One of the largest young craters on Mercury, 114 kilometer (71 mile) diameter Hokusai crater's bright rays are known to extend across much of the planet . But this mosaic of oblique views focuses on Hokusai close up, its sunlit central peaks , terraced crater walls , and frozen sea of impact melt on the crater's floor . The images were captured by the MESSENGER spacecraft. ...