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2. Mercury (planet) - Wikipedia

   en.wikipedia.org/wiki/Mercury_(planet)

   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). [4] Mercury is also smaller—albeit more massive—than the largest natural satellites in the Solar System, Ganymede and Titan.

3. Geology of Mercury - Wikipedia

   en.wikipedia.org/wiki/Geology_of_Mercury

   The geology of Mercury is the scientific study of the surface, crust, and interior of the planet Mercury. It emphasizes the composition, structure, history, and physical processes that shape the planet. It is analogous to the field of terrestrial geology. In planetary science, the term geology is used in its broadest sense to mean the study of ...

4. Mercury (element) - Wikipedia

   en.wikipedia.org/wiki/Mercury_(element)

   Mercury (element) rhombohedral (hR1) Mercury is a chemical element; it has symbol Hg and atomic number 80. It is also known as quicksilver and was formerly named hydrargyrum (/ haɪˈdrɑːrdʒərəm / hy-DRAR-jər-əm) from the Greek words hydor 'water' and argyros 'silver', from which its chemical symbol is derived. [8]

5. Exploration of Mercury - Wikipedia

   en.wikipedia.org/wiki/Exploration_of_Mercury

   The first probe to visit Mercury was Mariner 10. View of Mercury from Mariner 10 in March 1975. The exploration of Mercury has a minor role in the space interests of the world. It is the least explored inner planet. [1] As of 2015, the Mariner 10 and MESSENGER missions have been the only missions that have made close observations of Mercury.

6. Atmosphere of Mercury - Wikipedia

   en.wikipedia.org/wiki/Atmosphere_of_Mercury

   Mercury, being the closest to the Sun, with a weak magnetic field and the smallest mass of the recognized terrestrial planets, has a very tenuous and highly variable atmosphere (surface-bound exosphere) containing hydrogen, helium, oxygen, sodium, calcium, potassium and water vapor, with a combined pressure level of about 10 −14 bar (1 nPa ...

7. Mercury's magnetic field - Wikipedia

   en.wikipedia.org/wiki/Mercury's_magnetic_field

   Mercury's magnetic field is approximately a magnetic dipole (meaning the field has only two magnetic poles) [8] apparently global, [9] on planet Mercury. [10] Data from Mariner 10 led to its discovery in 1974; the spacecraft measured the field's strength as 1.1% that of Earth's magnetic field. [11] The origin of the magnetic field can be ...