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[music] Narrators: The interiors of some craters in the moon's polar

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regions, like Shackleton, haven't seen sunlight in over two billion years.

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However, new measurements have created our

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best-yet maps of these types of craters, allowing us to see deep into the shadows

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and learn more about this surprisingly young-looking impact crater in the

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south. [music]

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[music]

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[music fades] [beeping]

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[beeping fades]