Science: New Moon Over Saturn

Phoebe, Saturn's ninth moon, was discovered in 1898, and astronomers have been vainly looking for others ever since. Their long quest has finally been rewarded. French Astronomer Audouin Dollfus reported last week that he had found another friend for Phoebe—a tenth moon orbiting close to the outer edge of Saturn's rings.

The determined search for the new moon had actually been hindered by the spectacular rings, which reflect sunlight brilliantly, obscuring other objects in the vicinity of the planet. But though the rings are wide, they are also incredibly thin—perhaps even less than a foot thick. Thus every 14 years or so,...

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