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  • BBC Science Focus Magazine

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    Jul 27, 2023 2 minutes

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    BBC Science Focus, Eagle House, Bristol, BS14ST

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    Is the inside coming out?

    With regard to your cover feature, The Mysteries of Earth's Core (June, p66), I once came across a rather unnerving article on the possibility of planetary core expansion.

    It was based on the theory that some planets are approximately

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