News of the WeekPlanetary Science

Electron Shadow Hints at Invisible Rings Around a Moon

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Science  07 Mar 2008:
Vol. 319, Issue 5868, pp. 1325
DOI: 10.1126/science.319.5868.1325

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Space physicists poring over Cassini spacecraft data report on page 1380 of this week's issue of Science that they think they have two firsts: the first known natural satellites of a moon, which also form the first rings known to encircle a moon.