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What is the composition of mercury?

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Astronomers have estimated that the Mercury composition is made up of approximately 70% metals and 30% silicate material. In fact, it’s only slightly less dense than the Earth, with 5.43 g/cm 3. read more

Mercury, the innermost planet of the solar system and the eighth in size and mass. Its closeness to the Sun and its smallness make it the most elusive of the planets visible to the unaided eye. Because its rising or setting is always within about two hours of the Sun’s, it is never observable when the sky is fully dark. read more

Mercury's iron core generates a magnetic field about one percent as strong as Earth's. The field is quite active, frequently interacting with the solar wind and funneling plasma from the sun to the planet's surface. The hydrogen and helium captured from the solar wind help create part of Mercury's thin atmosphere. read more

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