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Mercury is the first planet from the Sun and the smallest in the Solar System. In English, it is named after the ancient Roman god Mercurius ( Mercury ), god of commerce and communication, and the messenger of the gods. Mercury is classified as a terrestrial planet, with roughly the same surface gravity as Mars.
Learn about Mercury, the smallest and fastest planet in our solar system, with NASA's overview, stories, images and more. Find out how Mercury's surface, orbit, atmosphere and history inspire science fiction and exploration.
An old [10] pound coin (density ~7.6 g/cm 3) floats on mercury due to the combination of the buoyant force and surface tension. Mercury is a heavy, silvery-white metal that is liquid at room temperature. Compared to other metals, it is a poor conductor of heat, but a fair conductor of electricity.
Jun 3, 2024 · 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.
- Clark R. Chapman
Learn about Mercury, the smallest and fastest planet in our solar system, and its extreme temperatures, surface features, and magnetic field. Find out why Mercury is named after the Roman god of speed and why it has no moons or rings.
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Learn about Mercury, the smallest and closest planet to the Sun, with no moons or rings. Find out about its craters, core, temperature, rotation, orbit, and more.
Learn about Mercury, the smallest and fastest planet in our solar system. Find out how it looks, how it spins, and what it is made of.