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Dantu (crater)
Dantu is a large crater on Ceres, located within the Vendimia Planitia. It is rimmed by a number of minor faculae, which together form Bright Spot 2. Etymology The crater is named after ''Dantu'', the timekeeper and first god of planting (millet) of the Gã people of Accra, Ghana.Marion Kilson (2013) ''Dancing with the Gods: Essays in Ga Ritual'' Formation Dantu is thought to have formed Ma (million years) ago, based on the amount of crater impacts present within its ejecta blankets. Physical features The walls of Dantu are quite heavily eroded, with most of the north-eastern wall having collapsed completely. Due to Dantu's relatively young age its crater floor is smooth, with few additional craters present within it. Dantu's floor is also home to a system of fractures, which are mostly located in the south of the crater. The center of Dantu is home to a peak, with a ring complex around said peak. The majority of Dantu's pit crater A pit crater (also called a subsidence ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceres (dwarf Planet)
Ceres (; minor-planet designation: 1 Ceres) is a dwarf planet in the asteroid belt between the orbits of Mars and Jupiter. It was the first asteroid discovered, on 1 January 1801, by Giuseppe Piazzi at Palermo Astronomical Observatory in Sicily and announced as a new planet. Ceres was later classified as an asteroid and then a dwarf planetthe only one always inside Neptune's orbit. Ceres's small size means that even at its brightest, it is too dim to be seen by the naked eye, except under extremely dark skies. Its apparent magnitude ranges from 6.7 to 9.3, peaking at opposition (when it is closest to Earth) once every 15- to 16-month synodic period. As a result, its surface features are barely visible even with the most powerful telescopes, and little was known about it until the robotic NASA spacecraft ''Dawn'' approached Ceres for its orbital mission in 2015. ''Dawn'' found Ceres's surface to be a mixture of water ice, and hydrated minerals such as carbonates and clay. Gra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USGS
The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization's work spans the disciplines of biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility. The agency was founded on March 3, 1879. The USGS is a bureau of the United States Department of the Interior; it is that department's sole scientific agency. The USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, and Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on the occasion of its hundredth anniv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dantu (mythology)
Dantu District () is one of three districts of Zhenjiang, Jiangsu province, China. A development called Dantu New City was constructed in the district and was underoccupied since around 2005 and criticized as a ghost city by international media. However, since 2013 the development has been filling up with residents with many operating shops and offices, becoming a functional suburb of urban Zhenjiang. There are two islands that belong to Dantu, in addition to the Yangtze River at the north it has a town. It is bordered to the east by the Jiajiang neighborhood in Yangzhong. To the south-east lies Danyang and to the west is Jurong. The Yangtze River The Yangtze or Yangzi ( or ; ) is the longest list of rivers of Asia, river in Asia, the list of rivers by length, third-longest in the world, and the longest in the world to flow entirely within one country. It rises at Jari Hill in th ... borders Dantu to the north. The district covers an area of 748.8 square kilometers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ga People
The Ga-Dangbe, Gã-Daŋbɛ, Ga-Dangme, or GaDangme are an ethnic group in Ghana, Togo and Benin. The Ga and Dangbe people are grouped respectively as part of the Ga–Dangme ethnolinguistic group. The Ga-Dangmes are one ethnic group that lives primarily in the Greater Accra of Ghana. Ethnic Ga family names (surnames) include Nikoi, Amon, Kotey, Kotie, Adei, Kutorkor, Oblitey, Lartey, Nortey, Aryee, Poku and Lamptey. The following are names derived from the ethnic Dangme and common among the Ningos Nartey, Tetteh, Kwei, Kweinor, Kwetey, Narteh, Narh, Dugbatey, Teye, Martey, Addo, Siaw, Saki, Amanor, Djangba. These are aligned to the ethnic Ga as well: Lomotey, Tetteh, Ankrah, Tetteyfio, Laryea, Ayitey, Okai, Bortey, Quaye, Quaynor, Ashong, Kotei, Sowah, Odoi, Ablor, Adjetey, Dodoo, Darku and Quartey. (Dawhenya royal family name: Darpoh) Under their great leader King Ayi Kushi (Cush) (1483-1519) they were led from the east in several states before reaching their destination in Acc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vendimia Planitia
Ceres is a dwarf planet in the asteroid belt that lies between the orbits of Mars and Jupiter. The IAU has adopted two themes for naming surface features on Ceres: agricultural deities for craters and agricultural festivals for everything else. As of 2020, the IAU has approved names for 151 geological features on Ceres: craters, montes, catenae, rupēs, plana, tholi, planitiae, fossae and sulci. In July 2018, NASA released a comparison of physical features found on Ceres with similar ones present on Earth. ''Piazzi'', named after Giuseppe Piazzi, the discoverer of Ceres, is a dark region southwest of Dantu crater in ground-based images that was named before ''Dawn'' arrived at Ceres. Overview of features Catenae Craters Ceres is saturated with impact crater An impact crater is a circular depression in the surface of a solid astronomical object formed by the hypervelocity impact of a smaller object. In contrast to volcanic craters, which result from explosion or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bright Spots On Ceres
Several bright surface features (also known as faculae) were discovered on the dwarf planet Ceres by the ''Dawn'' spacecraft in 2015. The brightest cluster of spots ("Spot 5") is located in an crater called Occator. The largest and brightest component of the cluster is in the center of the crater, with dimmer spots located towards this crater's eastern rim. Early in the orbital phase of the ''Dawn'' mission, the high albedo of these spots was speculated to be due to some kind of outgassing, and subsequent closer images helped scientists determine that it is a material with a high level of reflection, and suggested ice and salt as possibilities. These bright features have an albedo of about 40%, four times brighter than the average of Ceres's surface. On 9 December 2015, scientists reported that the bright spots on Ceres may be related to a type of salt, particularly a form of brine containing hydrated magnesium sulfate (MgSO4·6H2O); the spots were also found to be associat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bright Spots On Ceres
Several bright surface features (also known as faculae) were discovered on the dwarf planet Ceres by the ''Dawn'' spacecraft in 2015. The brightest cluster of spots ("Spot 5") is located in an crater called Occator. The largest and brightest component of the cluster is in the center of the crater, with dimmer spots located towards this crater's eastern rim. Early in the orbital phase of the ''Dawn'' mission, the high albedo of these spots was speculated to be due to some kind of outgassing, and subsequent closer images helped scientists determine that it is a material with a high level of reflection, and suggested ice and salt as possibilities. These bright features have an albedo of about 40%, four times brighter than the average of Ceres's surface. On 9 December 2015, scientists reported that the bright spots on Ceres may be related to a type of salt, particularly a form of brine containing hydrated magnesium sulfate (MgSO4·6H2O); the spots were also found to be associat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Millet
Millets () are a highly varied group of small-seeded grasses, widely grown around the world as cereal crops or grains for fodder and human food. Most species generally referred to as millets belong to the tribe Paniceae, but some millets also belong to various other taxa. Millets are important crops in the semiarid tropics of Asia and Africa (especially in India, Mali, Nigeria, and Niger), with 97% of millet production in developing countries. This crop is favored due to its productivity and short growing season under dry, high-temperature conditions. Millets are indigenous to many parts of the world. The most widely grown millets are sorghum and pearl millets, which are important crops in India and parts of Africa. Finger millet, proso millet, and foxtail millet are also important crop species. Millets may have been consumed by humans for about 7,000 years and potentially had "a pivotal role in the rise of multi-crop agriculture and settled farming societies." Descript ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gã People
The Ga-Dangbe, Gã-Daŋbɛ, Ga-Dangme, or GaDangme are an ethnic group in Ghana, Togo and Benin. The Ga and Dangbe people are grouped respectively as part of the Ga–Dangme languages, Ga–Dangme Ethnolinguistics, ethnolinguistic group. The Ga-Dangmes are one ethnic group that lives primarily in the Greater Accra of Ghana. Ethnic Ga family names (surnames) include Nikoi, Amon, Kotey, Kotie, Adei, Kutorkor, Oblitey, Lartey, Nortey, Aryee, Poku and Lamptey. The following are names derived from the ethnic Dangme and common among the Ningos Nartey, Tetteh, Kwei, Kweinor, Kwetey, Narteh, Narh, Dugbatey, Teye, Martey, Addo, Siaw, Saki, Amanor, Djangba. These are aligned to the ethnic Ga as well: Lomotey, Tetteh, Ankrah, Tetteyfio, Laryea, Ayitey, Okai, Bortey, Quaye, Quaynor, Ashong, Kotei, Sowah, Odoi, Ablor, Adjetey, Dodoo, Darku and Quartey. (Dawhenya royal family name: Darpoh) Under their great leader King Ayi Kushi (Cush) (1483-1519) they were led from the east in several states ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pit Crater
A pit crater (also called a subsidence crater or collapse crater) is a depression formed by a sinking or collapse of the surface lying above a void or empty chamber, rather than by the eruption of a volcano or lava vent. Pit craters are found on Mercury, Venus, Earth, Mars, and the Moon. Pit craters are often found in a series of aligned or offset chains and in these cases, the features is called a pit crater chain. Pit crater chains are distinguished from catenae or crater chains by their origin. When adjoining walls between pits in a pit crater chain collapse, they become troughs. In these cases, the craters may merge into a linear alignment and are commonly found along extensional structures such as fractures, fissures and graben. Pit craters usually lack an elevated rim as well as the ejecta deposits and lava flows that are associated with impact craters.Okubo, Chris, and Stephen Martel. "Pit crater formation on Kilauea volcano, Hawaii." Journal of Volcanology and Geotherm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geophysical Research Letters
''Geophysical Research Letters'' is a biweekly peer-reviewed scientific journal of geoscience published by the American Geophysical Union that was established in 1974. The editor-in-chief is Harihar Rajaram. Aims and scope The journal aims for rapid publication of concise research reports on one or more of the disciplines covered by the American Geophysical Union, such as atmospheric sciences, solid Earth, space science, oceanography, hydrology, land surface processes, and the cryosphere. The journal also publishes invited reviews that cover advances achieved during the past two or three years. The target readership is the earth science community, the broader scientific community, and the general public. Abstracting and indexing This journal is abstracted and indexed in: According to the 2020 ''Journal Citation Reports'', the journal has a 2019 impact factor of 4.58. ''Geophysical Research Letters'' was also the 5th most cited publication on climate change between 1999 and 2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Geophysical Union
The American Geophysical Union (AGU) is a 501(c)(3) nonprofit organization of Earth, atmospheric, ocean, hydrologic, space, and planetary scientists and enthusiasts that according to their website includes 130,000 people (not members). AGU's activities are focused on the organization and dissemination of scientific information in the interdisciplinary and international fields within the Earth and space sciences. The geophysical sciences involve four fundamental areas: atmospheric and ocean sciences; solid-Earth sciences; hydrologic sciences; and space sciences. The organization's headquarters is located on Florida Avenue in Washington, D.C. History The AGU was established in December 1919 by the National Research Council (NRC) to represent the United States in the International Union of Geodesy and Geophysics (IUGG), and its first chairman was William Bowie of the United States Coast and Geodetic Survey (USCGS). For more than 50 years, it operated as an unincorporated affili ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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