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Scientists Find What Could Be A History-Making Moon

(Top row, from left) Titan, Earth's moon, Europa and Enceladus. (Bottom row, from left) Callisto, Charon, Ariel and lo. (Courtesty of NASA)
(Top row, from left) Titan, Earth's moon, Europa and Enceladus. (Bottom row, from left) Callisto, Charon, Ariel and lo. (Courtesty of NASA)

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