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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). [2]
The surface of the planet Mercury has been divided into fifteen quadrangles, designated H-1 to H-15 (the 'H' stands for Hermes, the Greek equivalent of Mercury). [1] The quadrangles are named for prominent surface features visible within each area. [1]
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 , 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.
A map of Mercury [1] made in the 1910s by astronomer Eugène Michel Antoniadi shows the following albedo features, localized by a grid in which 0° longitude is the (assumed) subsolar meridian. No certain connection has been made between these features and the topographic features viewed on Mercury by the Mariner 10 spacecraft. Mariner 10 ...
Mercury's Caloris Basin is one of the largest impact features in the Solar System. At least 15 ancient basins have been identified on Mercury. [7] Tolstoj is a true multi-ring basin, displaying at least two, and possibly as many as four, concentric rings.
Caravaggio is an example of a Peak ring impact basin on Mercury. Several areas on Mercury are extremely dark, such as a small crater within Hemingway crater in the lower right. 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 ...
The Raditladi quadrangle (H-4) is one of fifteen quadrangles on Mercury. It runs from 270 to 180° longitude and 20 to 70° latitude. It runs from 270 to 180° longitude and 20 to 70° latitude. Named after the Raditladi Basin , it was mapped in detail for the first time after MESSENGER entered orbit around Mercury in 2011.
Caloris Planitia / k ə ˈ l ɔːr ɪ s p l ə ˈ n ɪ ʃ (i) ə / is a plain within a large impact basin on Mercury, informally named Caloris, about 1,550 km (960 mi) in diameter. [1] It is one of the largest impact basins in the Solar System.