Saturn probe turns towards its death plunge

Ever since it arrived at Saturn 13 years ago, the probe has used the gravity of Titan - the second biggest moon in the Solar System - to slingshot itself into different positions from which to study the planet and its stunning rings. It has been a smart strategy because Cassini would otherwise have had to fire up its propulsion system and drain its fuel reserves every time it wanted to make a big change in direction. As it is, those propellants are almost exhausted and Nasa is determined the spacecraft will not be permitted to just drift around Saturn uncontrolled; it must be disposed of properly and fully.