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Beethoven Quadrangle
The Beethoven quadrangle is located in the equatorial region of Mercury, in the center of the area imaged by ''Mariner 10''. Most pictures of the quadrangle were obtained at high sun angles as the ''Mariner 10'' spacecraft receded from the planet. Geologic map units are described and classified on the basis of morphology, texture, and albedo, and they are assigned relative ages based on stratigraphic relations and on visual comparisons of the density of superposed craters. Crater ages are established by relative freshness of appearance, as indicated by topographic sharpness of their rim crests and degree of preservation of interior and exterior features such as crater floors, walls, and ejecta aprons. Generally, topography appears highly subdued because of the sun angle, and boundaries between map units are not clearly defined. Impact craters larger than about 250 km are referred to as basins. Unlike many basins on the Moon, however, the two obvious basins in the quadrangl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H-7 Beethoven Quadrangle
H7, H07 or H-7 may refer to: * H7 Chaffron Way, a road part of the Milton Keynes grid road system * British NVC community H7, a heath communities in the British National Vegetation Classification system * DSC-H7, a 2007 Sony Cyber-shot H series camera * '' Halloween H20'', the seventh installment in the ''Halloween'' series * Highway H07 (Ukraine), a road in Ukraine * , a 1915 British H-class submarine * , a 1932 D-class destroyer of the British Royal Navy * Influenza A virus subtype H7 (other), all virus containing the H7 type agglutinin * , a 1918 United States Navy H-class submarine * H7 (monogram), monogram of Haakon VII of Norway and Norwegian World War II resistance symbol * H7 (lamp), an automotive halogen lamp * Hydrogen-7 (H-7 or 7H), an isotope of hydrogen See also *7H (other) 7H or 7-H can refer to: *A-7H, a model of LTV A-7 Corsair II *7H-Benz(de)anthracene-7-one, or Benzanthrone *Hydrogen-7 (7H), an isotope of hydrogen *7H, a model of SET 7 floa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crater Chain
A crater chain is a line of craters along the surface of an astronomical body. The descriptor term for crater chains is catena , plural catenae (Latin for "chain"), as specified by the International Astronomical Union's rules on planetary nomenclature. Many examples of such chains are thought to have been formed by the impact of a body that was broken up by tidal forces into a string of smaller objects following roughly the same orbit. An example of such a tidally disrupted body that was observed prior to its impact on Jupiter is Comet Shoemaker-Levy 9. During the Voyager observations of the Jupiter system, planetary scientists identified 13 crater chains on Callisto and three on Ganymede (except those formed by secondary craters). Later some of these chains turned out to be secondary or tectonic features, but some other chains were discovered. As of 1996, 8 primary chains on Callisto and 3 on Ganymede were confirmed. Other cases, such as many of those on Mars, represent c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sinuous Rille
Rille (German for 'groove') is typically used to describe any of the long, narrow depressions in the surface of the Moon that resemble channels. The Latin term is ''rima'', plural ''rimae''. Typically, a rille can be several kilometers wide and hundreds of kilometers in length. However, the term has also been used loosely to describe similar structures on a number of planets in the Solar System, including Mars, Venus, and on a number of moons. All bear a structural resemblance to each other. Structures Three types of rille are found on the lunar surface: * Sinuous rilles meander in a curved path like a mature river, and are commonly thought to be the remains of collapsed lava tubes or extinct lava flows. They usually begin at an extinct volcano, then meander and sometimes split as they are followed across the surface. , 195 sinuous rilles have been identified on the Moon. Vallis Schröteri in Oceanus Procellarum is the largest sinuous rille, and Rima Hadley is t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mars
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, only being larger than Mercury (planet), Mercury. In the English language, Mars is named for the Mars (mythology), Roman god of war. Mars is a terrestrial planet with a thin atmosphere (less than 1% that of Earth's), and has a crust primarily composed of elements similar to Earth's crust, as well as a core made of iron and nickel. Mars has surface features such as impact craters, valleys, dunes and polar ice caps. It has two small and irregularly shaped moons, Phobos (moon), Phobos and Deimos (moon), Deimos. Some of the most notable surface features on Mars include Olympus Mons, the largest volcano and List of tallest mountains in the Solar System, highest known mountain in the Solar System and Valles Marineris, one of the largest canyons in the Solar System. The North Polar Basin (Mars), Borealis basin in the Northern Hemisphere covers approximately 40% of the planet and may be a la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graben
In geology, a graben () is a depressed block of the crust of a planet or moon, bordered by parallel normal faults. Etymology ''Graben'' is a loan word from German, meaning 'ditch' or 'trench'. The word was first used in the geologic context by Eduard Suess in 1883. The plural form is either ''graben'' or ''grabens''. Formation A graben is a valley with a distinct escarpment on each side caused by the displacement of a block of land downward. Graben often occur side by side with horsts. Horst and graben structures indicate tensional forces and crustal stretching. Graben are produced from parallel normal faults, where the displacement of the hanging wall is downward, while that of the footwall is upward. The faults typically dip toward the center of the graben from both sides. Horsts are parallel blocks that remain between graben; the bounding faults of a horst typically dip away from the center line of the horst. Single or multiple graben can produce a rift valley. Half-g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Escarpment
An escarpment is a steep slope or long cliff that forms as a result of faulting or erosion and separates two relatively level areas having different elevations. The terms ''scarp'' and ''scarp face'' are often used interchangeably with ''escarpment''. Some sources differentiate the two terms, with ''escarpment'' referring to the margin between two landforms, and ''scarp'' referring to a cliff or a steep slope. In this usage an escarpment is a ridge which has a gentle slope on one side and a steep scarp on the other side. More loosely, the term ''scarp'' also describes a zone between a coastal lowland and a continental plateau which shows a marked, abrupt change in elevation caused by coastal erosion at the base of the plateau. Formation and description Scarps are generally formed by one of two processes: either by differential erosion of sedimentary rocks, or by movement of the Earth's crust at a geologic fault. The first process is the more common type: the escarpment is a t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fault (geology)
In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep. A ''fault plane'' is the plane that represents the fracture surface of a fault. A ''fault trace'' or ''fault line'' is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geologic maps to represent a fault. A ''fault zone'' is a cluster of parallel faults. However, the term is also used for the zone of crushed rock along a single fault. Prolonged motion along closely spaced faults can blur the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valmiki (crater)
Valmiki (; Sanskrit: वाल्मीकि, ) was a legendary poet who is celebrated as the traditional author of the epic '' Ramayana'', based on the attribution in the text itself. He is revered as ''Ādi Kavi'', the first poet, author of ''Ramayana'', the first epic poem. The ''Ramayana'', originally written by Valmiki, consists of 24,000 shlokas and seven cantos (kaṇḍas). The is composed of about 480,002 words, being a quarter of the length of the full text of the '' Mahabharata'' or about four times the length of the '' Iliad''. The ''Ramayana'' tells the story of a prince, Rama of the city of Ayodhya in the Kingdom of Kosala, whose wife Sita is abducted by Ravana, the demon-king ( Rakshasa) of Lanka. The scholars' estimates for the earliest stage of the text ranging from the 8th to 4th centuries BCE, and later stages extending up to the 3rd century CE, although original date of composition is unknown. As with many traditional epics, it has gone through a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Judah Ha-Levi (crater)
Judah Ha-Levi is a crater on Mercury. Its name was adopted by the International Astronomical Union (IAU) in 1976. Judah Ha-Levi is named for the Spanish-Jewish poet and philosopher Judah Ha-Levi, who lived from 1075 to 1141. Hollows are present within Judah Ha-Levi. To the southeast of Judah Ha-Levi is the peak ring A peak ring crater is a type of complex crater, which is different from a multi-ringed basin or central-peak crater. A central peak is not seen; instead, a roughly circular ring or plateau, possibly discontinuous, surrounds the crater's center, ... crater Wang Meng. To the northwest is Glinka, and to the northeast is Chiang Kʽui. Judah Ha-Levi crater EN1021645181M.jpg, Interior of Judah Ha-Levi Judah Ha-Levi crater floor MESSENGER NAC mosaic.jpg, Detail of interior showing two patches of hollows right of center Wang Meng Judah Ha-Levi Glinka craters EN0108821478M.jpg, Regional view from MESSENGER's first flyby in January 2008, showing Wang Meng below ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Breccia
Breccia () is a rock composed of large angular broken fragments of minerals or rocks cemented together by a fine-grained matrix. The word has its origins in the Italian language, in which it means "rubble". A breccia may have a variety of different origins, as indicated by the named types including sedimentary breccia, tectonic breccia, igneous breccia, impact breccia, and hydrothermal breccia. A megabreccia is a breccia composed of very large rock fragments, sometimes kilometers across, which can be formed by landslides, impact events, or caldera collapse. Types Breccia is composed of coarse rock fragments held together by cement or a fine-grained matrix. Like conglomerate, breccia contains at least 30 percent of gravel-sized particles (particles over 2mm in size), but it is distinguished from conglomerate because the rock fragments have sharp edges that have not been worn down. These indicate that the gravel was deposited very close to its source area, since otherwise th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vivaldi (crater)
Vivaldi is a crater on Mercury. It was named by the IAU after Italian composer Antonio Vivaldi in 1976. It has a prominent and nearly continuous inner ring whose diameter measures about half that of the outer ring. It is one of 110 peak ring basins on Mercury. Unlike some of the lunar multiringed structures, no vestiges of additional rings are apparent around this crater. It is classified as c3 age. File:Mariner 10 image 0166766.png, Mariner 10 image from 1974 208500main Vivaldi crater.jpg, Vivaldi is the large, shadow-filled, double ringed crater to the upper right. From MESSENGER ''MESSENGER'' was a NASA robotic space probe that orbited the planet Mercury between 2011 and 2015, studying Mercury's chemical composition, geology, and magnetic field. The name is a backronym for "Mercury Surface, Space Environment, Geoche ...'s first flyby in January 2008. File:Vivaldi crater EW0213895455G.jpg, Interior of Vivaldi showing possible hollows on the peak ring. File:Vivaldi cr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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