He predicted that Uranus had two more moons or moonlet streams than commonly thought.
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In 1989, he predicted that Neptune had four additional dark moons, at 5, 3.5, 2.5 and 1.8 radii in Neptune's equatorial plane.
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In 1981, Prentice theorised that the mass of Saturn's moon Tethys was in fact 20-25% larger than the generally predicted level.
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