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Peak-ring Craters
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, with the crater rim still farther out from the center. Formation The rings form by different processes, and inner rings may not be formed by the same processes as outer rings.Geology Pagewww.geologypage.com/2016/10/research-helps-explain-formation-ringed-crater-moon.html accessdate: February 5, 2017 It has long been the view that peak rings are formed in the stage subsequent to central peak formation in craters. The central peaks of craters are believed to originate from hydrodynamic flow of material lifted by inward-collapsing crater walls, while impact-shattered rock debris is briefly turned to fluid by strong vibrations that develop during crater formation. The peak-ring structure of Chicxulub crater was probably formed as inward-colla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Complex Crater
Complex craters are a type of large impact crater morphology. Above a certain threshold size, which varies with planetary gravity, the collapse and modification of the transient cavity is much more extensive, and the resulting structure is called a ''complex crater''. The collapse of the transient cavity is driven by gravity, and involves both the uplift of the central region and the inward collapse of the rim. The central uplift is not the result of ''elastic rebound'' which is a process in which a material with elastic strength attempts to return to its original geometry; rather the uplift is a process in which a material with little or no strength attempts to return to a state of gravitational equilibrium. Complex craters have uplifted centers, and they have typically broad flat shallow crater floors, and terraced walls. At the largest sizes, one or more exterior or interior rings may appear, and the structure may be labeled an ''impact basin'' rather than an impact crater. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holst (crater)
Holst is a crater on Mercury. Its name was adopted by the International Astronomical Union (IAU) on April 24, 2012. Holst is one of 110 peak ring basins on Mercury. To the east is another peak-ring basin, Nabokov, of similar size. Holst lies near the center of the ancient Lennon-Picasso Basin. Holst is named for the British composer Gustav Theodore Holst. Holst composed a musical suite called ''The Planets ''The Planets'', Op. 32, is a seven- movement orchestral suite by the English composer Gustav Holst, written between 1914 and 1917. In the last movement the orchestra is joined by a wordless female chorus. Each movement of the suite is name ...'', including its third movement ''Mercury, the Winged Messenger''. Holst crater mosaic EN0219644465M EN0219644470M.jpg, MESSENGER NAC mosaic Holst crater MESSENGER WAC IGF to RGB.jpg, Exaggerated color image Holst dark halo crater EN0222233517M.jpg, Closeup of crater with dark halo within the peak ring References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yablochkina (crater)
Yablochkina is an 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 internal collapse, impact crater ... on Venus. It was named after Aleksandra Yablochkina. References Impact craters on Venus {{Crater-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wheatley (crater)
Wheatley is a crater on Venus at latitude 16.6, longitude 268 in Asteria Regio. It is 74.8 km in diameter and was named after Phillis Wheatley Phillis Wheatley Peters, also spelled Phyllis and Wheatly ( – December 5, 1784) was an American author who is considered the first African-American author of a published book of poetry. Gates, Henry Louis, ''Trials of Phillis Wheatley: Ameri ..., the first black writer of note in America (1753-1784). References Impact craters on Venus {{crater-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mona Lisa (crater)
Mona Lisa is a crater on Venus at latitude 25.6, longitude 25.1. It is 79.4 km in diameter and was named after Lisa Giacondo, Leonardo da Vinci's model for the painting ''Mona Lisa The ''Mona Lisa'' ( ; it, Gioconda or ; french: Joconde ) is a Half length portrait, half-length portrait painting by Italian artist Leonardo da Vinci. Considered an archetypal masterpiece of the Italian Renaissance, it has been described ...''. Impact craters on Venus {{crater-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meitner (Venusian Crater)
Meitner is a multiring impact crater on Venus. This 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 internal collapse, impact crater ... was named after an Austrian-Swedish physicist, Lise Meitner, in her honour.Greeley, Ronald. Introduction to Planetary Geomorphology. 2013. Cambridge University Press. pg. 115. References Impact craters on Venus {{Crater-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isabella (crater)
Crater Isabella is the second largest impact crater on Venus. The feature is named in honor of the 15th Century queen of Spain, Isabella I of Castile. Located at 30 degrees south latitude, 204 degrees east longitude, the crater has two extensive flow-like structures extending to the south and to the southeast. The end of the southern flow partially surrounds a pre-existing circular volcanic shield. The southeastern flow shows a complex pattern of channels and flow lobes, and is overlain at its southeastern tip by deposits from a later diameter impact crater, Cohn. The extensive flows, unique to Venusian impact craters, are a continuing subject of study for a number of planetary scientists. It is thought that the flows may consist of 'impact melt,' rock melted by the intense heat released in the impact explosion. An alternate hypothesis invokes 'debris flows,' which may consist of clouds of hot gases and both melted and solid rock fragments that race across the landscape during the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barton (crater)
Barton crater is a 54-km (32-mi) diameter crater on Venus Venus is the second planet from the Sun. It is sometimes called Earth's "sister" or "twin" planet as it is almost as large and has a similar composition. As an interior planet to Earth, Venus (like Mercury) appears in Earth's sky never f .... It is the size at which craters on Venus begin to possess peak-rings instead of a single central peak. The floor of Barton crater is flat and radar-dark, indicating possible infilling by lava flows sometime following the impact. Barton's central peak-ring is discontinuous and appears to have been disrupted or separated during or following the cratering process. The crater is named after Clara Barton, the founder of the American Red Cross. References Impact craters on Venus crater {{crater-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Renoir (crater)
Renoir is a crater on the planet Mercury. Its name, after the French painter Pierre-Auguste Renoir (1841–1919), was adopted by the International Astronomical Union in 1976. Renoir is a peak ring basin, one of 110 on Mercury, including Raditladi and Rachmaninoff. Though these basins are relatively young geologic features, Renoir is one of the oldest of its type. Because of its greater age, Renoir displays more of the effects of tectonics and later impact events than the other peak ring impact basins. It is thought to have formed at the end of the period with the highest meteor impact rates in Mercury's history. It is located in the Kuiper quadrangle. Renoir also has an area of high reflectance, classified as a plain, resulting from previous volcanic activity on the planet. Like Rachmaninoff, it is a basin with a high-reflectance plain located entirely within the central peak ring. Renoir has a concentric ring structure, meaning that it is also called a "concentric ring bas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rachmaninoff (crater)
Rachmaninoff is a impact crater on Mercury. This basin, first imaged in its entirety during '' MESSENGER''s third Mercury flyby, was quickly identified as a feature of high scientific interest, because of its fresh appearance, its distinctively colored interior plains, and the extensional troughs on its floor. The morphology of Rachmaninoff is similar to that of Raditladi, which is one of the youngest impact basins on Mercury. The age of Raditladi is estimated at one billion years. Rachmaninoff appears to be only slightly older. The central part of Rachmaninoff is occupied by a 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, ... 130 km in diameter and somewhat elongated in the north–south direction. The area within it is covered by bright reddish smooth plains, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polygnotus (crater)
Polygnotus is a crater on Mercury, named by the IAU in 1976, after ancient Greek painter Polygnotus. Polygnotus has a central peak ring which is embayed with smooth plains material, which is very different in texture from the surrounding terrain. It is one of 110 peak ring basins on Mercury.Chapman, C. R., Baker, D. M. H., Barnouin, O. S., Fassett, C. I., Marchie, S., Merline, W. J., Ostrach, L. R., Prockter, L. M., and Strom, R. G., 2018. Impact Cratering of Mercury. In ''Mercury: The View After MESSENGER'' edited by Sean C. Solomon, Larry R. Nittler, and Brian J. Anderson. Cambridge Planetary Science. Chapter 9. Boethius Anicius Manlius Severinus Boethius, commonly known as Boethius (; Latin: ''Boetius''; 480 – 524 AD), was a Roman senator, consul, ''magister officiorum'', historian, and philosopher of the Early Middle Ages. He was a central figure in the tr ... crater is west of Polygnotus. References Impact craters on Mercury {{Mercury-planet-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nabokov (crater)
Nabokov is a crater on Mercury. Its name was adopted by the International Astronomical Union (IAU) on April 24, 2012. Nabokov is named for the Russian and American author Vladimir Nabokov. Nabokov is one of 110 peak ring basins on Mercury.Chapman, C. R., Baker, D. M. H., Barnouin, O. S., Fassett, C. I., Marchie, S., Merline, W. J., Ostrach, L. R., Prockter, L. M., and Strom, R. G., 2018. Impact Cratering of Mercury. In ''Mercury: The View After MESSENGER'' edited by Sean C. Solomon, Larry R. Nittler, and Brian J. Anderson. Cambridge Planetary Science. Chapter 9. To the west is another peak-ring basin, Holst, of similar size. To the north of Nabokov is Martins crater, and to the northeast is Barney. Nabokov lies on the east side of the ancient Lennon-Picasso Basin The Lennon-Picasso Basin is an ancient (Pre-Tolstoj (crater), Tolstojan) impact basin on Mercury (planet), Mercury, discovered from topographic mapping of the surface by the MESSENGER spacecraft. It is app ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
