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  1. Mercury is one of four terrestrial planets in the Solar System, which means it is a rocky body like Earth. It is the smallest planet in the Solar System, with an equatorial radius of 2,439.7 kilometres (1,516.0 mi). Mercury is also smaller—albeit more massive—than the largest natural satellites in the Solar System, Ganymede and Titan.

  2. 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.

  3. Mercury is a chemical element; it has symbol Hg and atomic number 80. It is also known as quicksilver and was formerly named hydrargyrum (/ h aɪ ˈ d r ɑːr dʒ ər ə m / hy-DRAR-jər-əm) from the Greek words hydor (water) and argyros (silver).

    • A year on Mercury is just 88 days long. One solar day (the time from noon to noon on the planet’s surface) on Mercury lasts the equivalent of 176 Earth days while the sidereal day (the time for 1 rotation in relation to a fixed point) lasts59 Earth days.
    • Mercury is the smallest planet in the Solar System. One of five planets visible with the naked eye a, Mercury is just 4,879 Kilometres across its equator, compared with 12,742 Kilometres for the Earth.
    • Mercury is the second densest planet. Even though the planet is small, Mercury is very dense. Each cubic centimetre has a density of 5.4 grams, with only the Earth having a higher density.
    • Mercury has wrinkles. As the iron core of the planet cooled and contracted, the surface of the planet became wrinkled. Scientist have named these wrinkles, Lobate Scarps.
  4. 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.

  5. 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.

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