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Valley Networks (Mars)
Valley networks are branching networks of valleys on Mars that superficially resemble terrestrial river drainage basins.Carr, M.H. (2006), The Surface of Mars. Cambridge Planetary Science Series, Cambridge University Press. They are found mainly erosion, incised into the terrain of the martian Geology of Mars#Hemispheric dichotomy, southern highlands, and are typically - though not always - of Noachian age (approximately four billion years old). The individual valleys are typically less than 5 kilometers wide, though they may extend for up to hundreds or even thousands of kilometers across the martian surface. The form, distribution, and implied evolution of the valley networks are of great importance for what they may tell us about the history of liquid water on Mars, water on the martian surface, and hence Mars' climate history. Some authors have argued that the properties of the networks demand that a hydrological cycle must have been active on ancient Mars,Craddock, R.A., and H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Branched Channels From Viking
A branch is a part of a woody plant. Branch or branches may also refer to: Places Australia * The Branch River, New South Wales Canada * Branch, Newfoundland and Labrador, a town France * Branches, Yonne, a commune New Zealand * Branch River (Taylor River tributary) * Branch River (Wairau River tributary) United States * Branch, Arkansas, a city * Branch, Louisiana, an unincorporated community and census-designated place * Branch, Michigan, an unincorporated community * Branch, Missouri, an unincorporated community * Branch, Texas, an unincorporated community * Branch, Wisconsin, an unincorporated community * Branch, Branch County, Michigan, a former village and first seat of the county * Branch County, Michigan * Branch Township (other) * Fort Branch, North Carolina, a Confederate fort in the American Civil War * Branch River (New Hampshire) * The Branch, also known as Branch River, New Hampshire * Branch River (Rhode Island) * Branch River (Wisconsin) People * Bran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Outflow Channel
Outflow channels are extremely long, wide swathes of scoured ground on Mars.Carr, M.H. (2006), ''The Surface of Mars''. Cambridge Planetary Science Series, Cambridge University Press. They extend many hundreds of kilometers in length and are typically greater than one kilometer in width. They are thought to have been carved by huge outburst floods. Crater counts indicate that most of the channels were cut since the early Hesperian,Hartmann, W.K., and Neukum, G. (2001). "Cratering chronology and the evolution of Mars". In: ''Chronology and Evolution of Mars'', ed. R. Kallenbach et al. Dordrecht: Kluwer, p. 165-94. though the age of the features is variable between different regions of Mars. Some outflow channels in the Amazonis and Elysium Planitiae regions have yielded ages of only tens of millions of years, extremely young by the standards of Martian topographic features.Burr, D.M., McEwan, A.S., and Sakimoto, S.E. (2002). "Recent aqueous floods from the Cerberus Fossae", '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eberswalde
Eberswalde () is a major town and the administrative seat of the district Barnim in Brandenburg in north-eastern Germany, about northeast of Berlin. Population 42,144 (census in June 2005). The town is often called Waldstadt (forest town), because of the large forests around it, including the Schorfheide-Chorin Biosphere Reserve. Despite this fact, Eberswalde was an important industrial center until the German Reunification. History Prehistory The area around Eberswalde was already populated in Paleolithic. Before the establishment of the Margraviate of Brandenburg it was the place of a Slavic tribes, Slavic stockade. The Eberswalde Hoard, Treasure of Eberswalde, the largest pre-Christian gold treasure from the area of today's Germany was found here. Today the treasure is located in the Pushkin Museum in Moscow. Founding and development The town of ''Everswolde'' ("forest of the boars") was established in 1254 by the Ascanian margrave Johann I. It was first mentioned in a docu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amazonian Period
The geological history of Mars follows the physical evolution of Mars as substantiated by observations, indirect and direct measurements, and various inference techniques. Methods dating back to 17th-century techniques developed by Nicholas Steno, including the so-called law of superposition and stratigraphy, used to estimate the geological histories of Earth and the Moon, are being actively applied to the data available from several Martian observational and measurement resources. These include landers, orbiting platforms, Earth-based observations, and Martian meteorites. Observations of the surfaces of many Solar System bodies reveal important clues about their evolution. For example, a lava flow that spreads out and fills a large impact crater is likely to be younger than the crater. On the other hand, a small crater on top of the same lava flow is likely to be younger than both the lava and the larger crater since it can be surmised to have been the product of a later, unobs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crater Counting
Crater counting is a method for estimating the age of a planet's surface based upon the assumptions that when a piece of planetary surface is new, then it has no impact craters; impact craters accumulate after that at a rate that is assumed known. Consequently, counting how many craters of various sizes there are in a given area allows determining how long they have accumulated and, consequently, how long ago the surface has formed. The method has been calibrated using the ages obtained by radiometric dating of samples returned from the Moon by the Luna programme, Luna and Apollo program, Apollo missions. It has been used to estimate the age of areas on Mars and other planets that were covered by lava flows, on the Moon of areas covered by giant lunar mare, mares, and how long ago areas on the Moons of Jupiter, icy moons of Jupiter and Moons of Saturn, Saturn flooded with new ice. Crater counting and secondary craters The crater counting method requires the presence of independent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terra Cimmeria
Terra Cimmeria is a large Martian region, centered at and covering at its broadest extent. It covers latitudes 15 N to 75 S and longitudes 170 to 260 W. It lies in the Eridania quadrangle. Terra Cimmeria is one part of the heavily cratered, southern highland region of the planet. The Spirit rover landed near the area. The word Cimmerium comes from an ancient Thracian seafaring people. The land was always covered in clouds and mist. A high altitude visual phenomena, probably a condensation cloud, was seen above this region in late March 2012. NASA tried to observe it with some of its Mars orbiters, including the THEMIS instrument on the 2001 Mars Odyssey spacecraft and MARCI on the Mars Reconnaissance Orbiter. Martian gullies Terra Cimmeria is the location of gullies that may be due to recent flowing water. Gullies occur on steep slopes, especially on the walls of craters. Gullies are believed to be relatively young because they have few if any craters. Moreover, they lie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hellas Planitia
Hellas Planitia is a plain located within the huge, roughly circular impact basin Hellas located in the southern hemisphere of the planet Mars. Hellas is the fourth- or fifth-largest known impact crater in the Solar System. The basin floor is about deep, deeper than the Moon's South Pole-Aitken basin, and extends about east to west.The part below zero datum, see Geography of Mars#Zero elevation It is centered at It features the lowest point on Mars, serves as a known source of global dust storms, and may have contained lakes and glaciers. Hellas Planitia spans the boundary between the Hellas quadrangle and the Noachis quadrangle. Description With a diameter of about , it is the largest unambiguous well-exposed impact structure on the planet; the obscured Utopia Planitia is slightly larger (the Borealis Basin, if it proves to be an impact crater, is considerably larger). Hellas Planitia is thought to have been formed during the Late Heavy Bombardment period of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arabia Terra
Arabia Terra is a large upland region in the north of Mars that lies mostly in the Arabia quadrangle, but a small part is in the Mare Acidalium quadrangle. It is densely cratered and heavily eroded. This battered topography indicates great age, and Arabia Terra is presumed to be one of the oldest terrains on the planet. It covers as much as at its longest extent, centered roughly at with its eastern and southern regions rising above the north-west. Alongside its many craters, canyons wind through the Arabia Terra, many emptying into the large northern lowlands of the planet, which borders Arabia Terra to the north. Features Arabia contains many interesting features. There are some good examples of pedestal craters in the area. A pedestal crater has its ejecta above the surrounding terrain, often forming a steep cliff. The ejecta forms a resistant layer that protects the underlying material from erosion. Mounds and buttes on the floor of some craters display many layers. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanism On Mars
Volcanic activity, or volcanism, has played a significant role in the geologic evolution of Mars. Scientists have known since the Mariner 9 mission in 1972 that volcanic features cover large portions of the Martian surface. These features include extensive lava flows, vast lava plains, and, such as Olympus Mons, the largest known volcanoes in the Solar System. Martian volcanic features range in age from Noachian (>3.7 billion years) to late Amazonian (< 500 million years), indicating that the planet has been volcanically active throughout its history, and some speculate it probably still is so today. Both Mars and Earth are large, differentiated |
Lava
Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a Natural satellite, moon onto its surface. Lava may be erupted at a volcano or through a Fissure vent, fracture in the Crust (geology), crust, on land or underwater, usually at temperatures from . The volcanic rock resulting from subsequent cooling is often also called ''lava''. A lava flow is an outpouring of lava during an effusive eruption. (An explosive eruption, by contrast, produces a mixture of volcanic ash and other fragments called tephra, not lava flows.) The viscosity of most lava is about that of ketchup, roughly 10,000 to 100,000 times that of water. Even so, lava can flow great distances before cooling causes it to solidify, because lava exposed to air quickly develops a solid crust that insulates the remaining liquid lava, helping to keep it hot and inviscid enough to continue flowing. Etymology The word ''lava'' comes from Ital ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hesperian
The Hesperian is a system (stratigraphy), geologic system and geologic timescale, time period on the planet Mars characterized by widespread Volcanology of Mars, volcanic activity and catastrophic flooding that carved immense outflow channels across the surface. The Hesperian is an intermediate and transitional period of Martian history. During the Hesperian, Mars changed from the wetter and perhaps warmer world of the Noachian (Mars), Noachian to the dry, cold, and dusty planet seen today. The absolute age of the Hesperian Period is uncertain. The beginning of the period followed the end of the Late Heavy Bombardment and probably corresponds to the start of the lunar Late Imbrian period, around 3700 million years ago (Myr, Mya). The end of the Hesperian Period is much more uncertain and could range anywhere from 3200 to 2000 Mya, with 3000 Mya being frequently cited. The Hesperian Period is roughly coincident with the Earth's early Archean Eon. With the decline of heavy impacts a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Candor Channels
Candor or candour may refer to: * Candor or parrhesia, the quality of speaking candidly in rhetoric * ''Candour'' (magazine), a British far-right magazine * "Candour", a song by Neck Deep from their 2014 album ''Wishful Thinking'' * Duty of candour, a concept in British law * ''Candor'', a 2009 speculative fiction novel by Pam Bachorz * Candor (company), a financial technology company Towns * Candor, New York, a town. * Candor (village), New York, a village within the town. * Candor, North Carolina Candor is a town in Montgomery and Moore counties, North Carolina, United States. The population was 813 at the 2020 census. Candor is the home of the North Carolina Peach Festival, held every year on the third Saturday of July. History Candor .... * Candor, Oise, France. See also *Candor, one of the five factions in the ''Divergent'' series by Veronica Roth * Kandor (other) {{disambiguation, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
