Final answer:
Scientists believe that Enceladus, a small icy moon, is in the middle of Saturn. The ongoing existence of the E Ring indicates that it is being replenished by a source at Enceladus.
Step-by-step explanation:
Scientists believe that in the middle of Saturn there is a small icy moon called Enceladus. Enceladus is approximately 500 kilometers in diameter and has active geysers of water being expelled into space.
The ongoing existence of a faint ring around Saturn, known as the E Ring, strongly suggests that it is being continually replenished by a source at Enceladus. The particles in the E Ring are composed of water ice and are very small in size.