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  1. 19322

    Your article neglects the most difficult problem associated with sending a probe to the vicinity of Earth’s core: sending the information back. Even a few feet of earth will stop conventional radio waves. Extra-low-frequency transmissions would do the job, but a transmission could take years. Augusto Soux San Diego, Calif. David J. Stevenson of the […]

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  2. Earth

    Going Down? Probe could ride to Earth’s core in a mass of molten iron

    A geophysicist suggests that scientists could explore Earth's inner structure by sending a grapefruit-size probe on a week-long mission to the Earth's core inside a crust-busting mass of molten iron.

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  3. 19242

    There is another interpretation of the mitochondrial DNA data presented in this article.