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Ina crater
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How a young-looking lunar volcano hides its true age

A young-looking volcanic caldera on the Moon has been interpreted by some as evidence of relatively recent lunar volcanic activity, but new research suggests it's not so young after all.
While orbiting the Moon in 1971, the crew of Apollo 15 photographed a strange geological feature - a bumpy, D-shaped depression about two miles long and a mile wide - that has fascinated planetary scientists ever since. Some have suggested that the feature, known as Ina, is evidence of a volcanic eruption Moon within the past 100 million years - a billion years or so after most volcanic activity on the Moon is thought to have ceased.

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