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Title: What surface region of the Moon is oldest? How do we know this? Post by: barry on Jul 29, 2013 What surface region of the Moon is oldest? How do we know this?
Title: Re: What surface region of the Moon is oldest? How do we know this? Post by: doseofmegan on Jul 29, 2013 "The oldest surface region of the moon is the Lunar Highlands, which are 4.4 billion years old."
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