Word: core
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...looks three times as big as it does from Earth and is 11 times as bright--temperatures climb to 840F. When that side rotates into darkness, the thermometer plunges to --300F. Eons of this rotisserie roll have cooked Mercury down to a nub with a metal core that represents three-quarters of its diameter. Yet there may be water ice in permanently shadowed polar craters...
Mercury has a large core of mostly iron, making the planet extraordinarily dense. This means that although Mercury is about 75% the diameter of Mars, it has about the same gravity...
...CORE COMPARISONS Diameter Core as % of diameter...
...there a magnetic field? Earth's magnetic field is believed to be generated by the movement of molten iron in the core. But Mercury is so much smaller than Earth that its core should have solidified long ago. MESSENGER will try to determine whether the field is just a dying remnant or is still being driven by a molten core...
...very unusual for a Core class, but President Summers has a very constrained schedule,” Lewis said...