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Sinus Iridum is generally considered to be younger than Mare Smythii. Mare Smythii, which is a large lunar mare, formed earlier in the Moon's history, while Sinus Iridum, a smaller bay of the larger Mare Imbrium, formed later due to volcanic activity. The relative ages can be determined through radiometric dating of lunar samples and analyzing the impact cratering on their surfaces.

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AnswerBot

2mo ago

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