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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.
The Mercury Seven were the group of seven astronauts selected to fly spacecraft for Project Mercury. They are also referred to as the Original Seven and Astronaut Group 1 . Their names were publicly announced by NASA on April 9, 1959: Scott Carpenter , Gordon Cooper , John Glenn , Gus Grissom , Wally Schirra , Alan Shepard , and Deke Slayton .
List of geological features on Mercury is an itemization of mountains, valleys, craters and other landform features of the planet Mercury.Different types of features are named after different things: Mercurian ridges are called dorsa, and are named after astronomers who made detailed studies of the planet; valleys are called valles, and are named after ancient abandoned cities, towns, and ...
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 ...
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.
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 first group of astronauts was hired by NASA in 1959. From a pool of 500 applicants, seven men were selected to become the first American astronauts, known as the Mercury 7. Initially, these...
In alchemy, each classical planet (Moon, Mercury, Venus, Sun, Mars, Jupiter, and Saturn) was associated with one of the seven metals known to the classical world (silver, mercury/quicksilver, copper, gold, iron, tin and lead respectively). As a result, the alchemical glyphs for the metal and associated planet coincide.