Flail Chest. Flail chest describes a situation in which a portion of the rib cage is separated from the rest of the chest wall, usually due to a severe blunt trauma, such as a serious fall or a car accident.
The Moons of Saturn. Saturn has 52 known satellites as of 2008, 7 of which were discovered by the Voyager spacecraft. The largest and most interesting is Titan, which is 3600 miles in diameter and 922,000 miles from Saturn. It is the only satellite to have a thick atmosphere, and a surprisingly dense one, too: 1.6 atmospheres.
Saturn's Cassini Division. Saturn's ring system has gaps throughout it, though only a few of these gaps were known before space probes were able to visit the planet. The largest of these gaps is called the Cassini division, after its French discoverer Jean D. Cassini. It is about 4,800 kilometers wide, although this varies quite a bit around the planet. The gaps are produced by the gravitational pull of one or more of Saturn's many moons on the tiny particles in the rings.