It was our first close-up view of the tiny planet, showing craters as small as 500 feet (150 meters) across. The image above, taken on March 29, 1974, was captured when Mariner 10 was 3,700 miles ...
during its 50th orbit of the giant planet. Processing by citizen scientist Kevin M. Gill. There was no moon close-up this time, but Juno was able to capture this wide-angle image (above ...