New orbital data on two moons of Uranus and two rings suggest the seventh planet may be a more chaotic place than thought. The two new moons, dubbed Cupid and Mab, were discovered in 2003 using the Hubble Space Telescope and archived images from the Voyager 2 spacecraft. Since then, the moons' discoverers, Mark Showalter of the SETI Institute and Jack Lissauer of NASA Ames Research Center, both in California, US, have refined the orbits of the moons and spotted two previously undetected dust rings. “To me, the exciting part of this discovery is the fact that there were these...