Liquid Center: Mercury has a molten core, radar reveals

By Ron Cowen, 15:57 PM April 15, 2008

Mercury is hot stuff. That's the conclusion of a new radar study demonstrating that the core of the solar system's innermost planet is at least partially molten. The finding settles a long-simmering debate about the least studied of the planets. It may also provide insight about how the solar system created its planets.

With Mercury averaging just a third as far from the sun as Earth is, it might seem clear-cut that Mercury's core would be molten. But sunlight has a negligible effect compared...

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