Videos are generally available for preview to non-members as short clips. Limited full-length titles are also available. Log In to view the full length title.
Learn about the discovery Saturn's largest ring. In 2009, astronomers announced the discovery of an enormous, diffuse ring that starts about 6 million kilometers away from Saturn and extends another 12 million kilometers. The ring is so dark that it had escaped observation until the Spitzer Space Telescope detected its infrared radiation.
