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Valhalla (crater)
Located on Jupiter's moon Callisto, Valhalla is the largest multi-ring impact crater in the Solar System. It is named after Valhalla, the hall where warriors are taken after death in Norse mythology. Valhalla consists of a bright central region 360 km across, an inner ridge and trough zone, and striking concentric rings extending up to about 1,900 km from the center. Several large impact craters and crater chains are superimposed on Valhalla. The multi-ring system may have formed as semi-liquid or liquid material underlying the brittle lithosphere punctured by the impactor slumped towards the center of the crater following the impact. General description Valhalla is the largest multi-ring basin on Callisto and in the Solar System (with diameter up to 3,800 km). It was discovered by the Voyager probes in 1979–80 and is located on the leading hemisphere of Callisto, in its Jupiter facing quadrant slightly to the north of the equator (at about 18°N latitude ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valhalla Crater On Callisto
In Norse mythology Valhalla (;) is the anglicised name for non, Valhǫll ("hall of the slain").Orchard (1997:171–172) It is described as a majestic hall located in Asgard and presided over by the god Odin. Half of those who die in combat enter Valhalla, while the other half are chosen by the goddess Freyja to reside in Fólkvangr. The masses of those killed in combat (known as the Einherjar) along with various legendary Germanic mythology, Germanic heroes and kings, live in Valhalla until Ragnarök when they will march out of its many doors to fight in aid of Odin against the jötnar. Valhalla is attested in the ''Poetic Edda'', compiled in the 13th century from earlier traditional sources, in the ''Prose Edda'' (written in the 13th century by Snorri Sturluson), in ''Heimskringla'' (also written in the 13th century by Snorri Sturluson), and in stanzas of an anonymous 10th century poem commemorating the death of Eric Bloodaxe known as ''Eiríksmál'' as compiled in ''Fagrski ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trough (geology)
In geology, a trough is a linear structural depression that extends laterally over a distance. Although it is less steep than a trench, a trough can be a narrow basin or a geologic rift. These features often form at the rim of tectonic plates. There are various oceanic troughs on the ocean floors. Examples of oceanic troughs * Benue Trough * Cayman Trough * Kings Trough * Hesperides Trough * Nankai Trough * Northumberland Trough * Okinawa Trough in the East China Sea * Rockall Trough and others along the rift of the mid-oceanic ridge * Salton Trough * South Shetland Trough * Suakin TroughDinwiddie, Robert et al. (2008) ''Ocean: The World's Last Wilderness Revealed'', London, Dorling Kindersley, page 452. in the Red Sea * Timor Trough See also * Walker Lane * Oceanic basin In hydrology, an oceanic basin (or ocean basin) is anywhere on Earth that is covered by seawater. Geologically, ocean basins are large geologic basins that are below sea level. Most ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2312 (novel)
''2312'' is a hard science fiction novel by American writer Kim Stanley Robinson, published in 2012. It is set in the year 2312 when society has spread out across the Solar System. The novel won the 2013 Nebula Award for Best Novel.2012 Nebula Award Winners " Locus Magazine, May 18, 2013. Plot summary The novel is set in the year 2312, in the great city of Terminator on , which is built on gigantic tracks in order to constantly stay in the planet's habitable zone near the . Swan Er Hong, an artist and form ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galileo's Dream
''Galileo's Dream'' (2009) is a science fiction novel with elements of historical fiction written by author Kim Stanley Robinson. The book itself describes the life of 17th-century scientist and astronomer Galileo Galilei, and the far-future society living on the Galilean moons he discovered. Italicised portions of the text within the novel are actually translations of Galileo and his contemporaries own recorded writings. It was published in hardcover on August 6, 2009, in the United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the European mainland, continental mainland. It comprises England, Scotlan ... and on December 29, 2009, in the United States. Reception Robinson was praised for his depiction of Galileo in both his greatness and his weaknesses, and for the handling of themes such as the relation between our perception of time and memor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kim Stanley Robinson
Kim Stanley Robinson (born March 23, 1952) is an American writer of science fiction. He has published twenty-two novels and numerous short stories and is best known for his ''Mars'' trilogy. His work has been translated into 24 languages. Many of his novels and stories have ecological, cultural, and political themes and feature scientists as heroes. Robinson has won numerous awards, including the Hugo Award for Best Novel, the Nebula Award for Best Novel and the World Fantasy Award. Robinson's work has been labeled by ''The Atlantic'' as "the gold-standard of realistic, and highly literary, science-fiction writing." According to an article in ''The New Yorker'', Robinson is "generally acknowledged as one of the greatest living science-fiction writers." Early life and education Robinson was born in Waukegan, Illinois. He moved to Southern California as a child. In 1974, he earned a B.A. in literature from the University of California, San Diego. In 1975, he earned an M.A. in Eng ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antipodal Point
In mathematics, antipodal points of a sphere are those diametrically opposite to each other (the specific qualities of such a definition are that a line drawn from the one to the other passes through the center of the sphere so forms a true diameter). This term applies to opposite points on a circle or any n-sphere. An antipodal point is sometimes called an antipode, a back-formation from the Greek loan word ''antipodes'', meaning "opposite (the) feet", as the true word singular is ''antipus''. Theory In mathematics, the concept of ''antipodal points'' is generalized to spheres of any dimension: two points on the sphere are antipodal if they are opposite ''through the centre''; for example, taking the centre as origin, they are points with related vectors v and −v. On a circle, such points are also called diametrically opposite. In other words, each line through the centre intersects the sphere in two points, one for each ray out from the centre, and these two poin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnetometry
A magnetometer is a device that measures magnetic field or magnetic dipole moment. Different types of magnetometers measure the direction, strength, or relative change of a magnetic field at a particular location. A compass is one such device, one that measures the direction of an ambient magnetic field, in this case, the Earth's magnetic field. Other magnetometers measure the magnetic dipole moment of a magnetic material such as a ferromagnet, for example by recording the effect of this magnetic dipole on the induced current in a coil. The first magnetometer capable of measuring the absolute magnetic intensity at a point in space was invented by Carl Friedrich Gauss in 1833 and notable developments in the 19th century included the Hall effect, which is still widely used. Magnetometers are widely used for measuring the Earth's magnetic field, in geophysical surveys, to detect magnetic anomalies of various types, and to determine the dipole moment of magnetic materials. In an air ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valhalla Troughs
In Norse mythology Valhalla (;) is the anglicised name for non, Valhǫll ("hall of the slain").Orchard (1997:171–172) It is described as a majestic hall located in Asgard and presided over by the god Odin. Half of those who die in combat enter Valhalla, while the other half are chosen by the goddess Freyja to reside in Fólkvangr. The masses of those killed in combat (known as the Einherjar) along with various legendary Germanic heroes and kings, live in Valhalla until Ragnarök when they will march out of its many doors to fight in aid of Odin against the jötnar. Valhalla is attested in the ''Poetic Edda'', compiled in the 13th century from earlier traditional sources, in the ''Prose Edda'' (written in the 13th century by Snorri Sturluson), in ''Heimskringla'' (also written in the 13th century by Snorri Sturluson), and in stanzas of an anonymous 10th century poem commemorating the death of Eric Bloodaxe known as ''Eiríksmál'' as compiled in ''Fagrskinna''. Valhalla in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asgard (crater)
Asgard is the second largest multi-ringed basin (large impact crater) on Jupiter's moon Callisto. It is named after Asgard, the realm of the gods in Norse mythology Norse, Nordic, or Scandinavian mythology is the body of myths belonging to the North Germanic peoples, stemming from Old Norse religion and continuing after the Christianization of Scandinavia, and into the Nordic folklore of the modern period .... The central part of Asgard is dominated by the domed Doh impact crater. A smaller multi-ring structure is superposed on the northern part of Asgard. It is called Utgard (also from Norse mythology) and measures around in diameter. Utgard is the fourth largest multi-ring feature on Callisto. A substantial part of the central region of Utgard is covered with deposits from the relatively young Burr crater. References {{DEFAULTSORT:Asgard (Crater) Surface features on Callisto (moon) Impact craters on Jupiter's moons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gomul Catena
Gomul Catena is a chain of craters on Jupiter's moon, Callisto. It is situated in the northern part of Valhalla In Norse mythology Valhalla (;) is the anglicised name for non, Valhǫll ("hall of the slain").Orchard (1997:171–172) It is described as a majestic hall located in Asgard and presided over by the god Odin. Half of those who die in combat e ... multi-ring structure. The craters in the catena seem to have formed from east to west. Such features are thought to originate as secondary craters or due to fragmentation of the impactor. Gomul Catena is named after a Norse river Gomul. References Surface features on Callisto (moon) {{crater-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catena (geology)
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 chai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
