I cannot wrap my brain around that image. The craters all look like they bulge out to me. This is because the sunlight originates from below the scene but my brain insists that sunlight always originates from above a scene. Below is the same image rotated 180 degrees.
The image was taken by the space probe Cassini – part of the Cassini-Huygens spacecraft launched on 15th October 1997. The Cassini part of the name was in honour of astronomer Giovanni Domenico Cassini who was the first to observe four of Saturn’s moons. He also discovered the Cassini division which is the main gap in the ring system. The Huygens part of the name is in honour of astronomer Christiaan Huygens who studied Saturn’s rings. In 1656 Huygens discovered they consisted of rocks.