What little rocky material occurs in today's ring system probably is the debris of collisions between icy ring particles and asteroids and comets swept up by the planet's huge gravitational field, says Canup. (sciencemag.org)
The space rock is just 154 miles wide, yet when it passed in front of a distant star, two delicate, icy rings clearly stood out. (discovermagazine.com)
Rob Chancia, a University of Idaho doctoral student, spotted key patterns in the rings while examining decades - old images of Uranus» icy rings taken by Voyager 2 in 1986. (sciencedaily.com)