Revisiting Saturn's Rings: Younger Than Previously Believed.

A new study suggests that Saturn's rings are between 400 million and 100 million years old, meaning we are lucky to witness them. The rings are composed almost entirely of billions of particles of water ice, with deposits of darker, dusty material. The rings are no older than 400 million years and may be as young as 100 million years. The rings will probably be gone in as little as 100 million years due to "ring rain," where ice and dust are lost from the rings over time.