LYCOS RETRIEVER 
Mercury (Planet): Density
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Mercury's high density can be used to infer details of its inner structure. While the Earth's high density results partly from compression at the core, Mercury is much smaller and its inner regions are not nearly so compressed. Therefore, for it to have such a high density, its core must be large and rich in iron.[2] Geologists estimate that Mercury's core occupies about 42% of its volume. (Earth's core occupies about 17% of its volume.)
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At ordinary temperatures mercury is a shining, mobile liquid, silvery-white in color. Slightly volatile at room temperature, mercury becomes solid when subjected to a pressure of 7,640 atmospheres (7.7 million millibars), and this pressure is used as a standard in measuring extremely high pressures. The metal dissolves in nitric or concentrated sulfuric acid but is resistant to alkalis. When cooled to sufficiently low temperatures, mercury exhibits superconductivity (the ability to conduct electrical currents with zero resistance). Mercury has a freezing point of about -39°C (about -38°F), a boiling point of about 357°C (about 674°F), and a density of 13.55 grams per cu cm. The atomic weight of mercury is 200.59.
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The major issue to be resolved by the mission is why is Mercury so dense? Currently, there are three conflicting theories explaining the density, but no real facts backing them up. The theories are:
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Density