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Science 17 February 2006:
Vol. 311. no. 5763, p. 913
DOI: 10.1126/science.311.5763.913b
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This Week in Science

Two additional moons, named Mab and Cupid, and two outer rings have been discovered around Uranus by Showalter and Lissauer (p. 973, published online 22 December 2005; see the cover and the Perspective by Murray). These new members of the uranian system were spotted in images from the Hubble Space Telescope and traced in earlier pictures from Voyager 2. Substantial changes are seen in the passages of the moons and brightness of the rings since the Voyager 2 fly-by. Many of Uranus' moons do not follow simple keplerian orbits but exhibit complex dynamics, which suggest that the whole system is gravitationally unstable or chaotic.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)