Uranus’ rings appear edge-on to the Earth in August 2007 (far right) and the angle reveals the unlit side of the rings. The series of infrared images shows the change in viewing aspect, or ring opening angle. The Sun will cross the ring plane of Uranus on 7 December 2007. Credit: Imke de Pater/UC Berkeley, Heidi B. Hammel/Space Science Institute, and the W.M. Keck Observatory
