The Cassini probe had two encounters with moons of Saturn last week. One with Enceladus was a close one, only about 48 miles from that moon at closest approach; the goal was to learn more about that moon's gravitational field, and therefore its internal structure. The second encounter was a long distance photography session with the moon Dione. From 5,000 miles, Cassini was still able to snap some interesting new images of that alien surface.
Nor is Cassini finished encountering in May. Later, it has another fly by opportunity with mighty, mysterious Titan.