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This ancient shark fossil is exquisite. But some researchers wonder if they’ll be able to study it


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5 Undersung Signposts Of Earth’s Evolution

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Remnants of an ancient planet buried inside the Earth may be the cause of a weak spot in the magnetic field

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The remnants of an ancient planet might be buried inside Earth. New research suggests the Moon-forming Theia impactor (a Mars-size body that struck Earth 4.5 billion years ago) might have merged with our planet, forming two dense clumps in Earth's mantel that still exist to this day.