NASA spacecraft to begin closest approach to Saturn's rings
NASA's Cassini spacecraft will soon begin a series of 'ring-grazing' orbits, during which it will make its closest approach to Saturn's rings since its 2004 arrival, the space agency said. Between November 30 and April 22, Cassini will make 20 orbits through the unexplored region at the main rings' outer edge, attempting to sample ring particles and trace gas molecules.