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Tectonics On Icy Moons
Tectonic activity has been studied on several icy moons. Background Igneous activity on icy moons can be defined as the melting, ascension, and solidification of liquids, particularly water and its ice polymorphs. Tectonic features on icy lithospheres occur by global and regional stresses acting on the moon's interior. Fractures in the icy lithosphere influence the mechanisms by which the lithosphere reacts to stress. An unfractured ice lithosphere has a greater shear strength than tensile strength, and accordingly, compressional deformation must occur by shear failure and cause thrust and strike-slip faulting. Conversely, prefractured ice has much less shear strength, and extensional stress will produce normal faults and graben. Residual heat from accretion is one possible source of internal heat for icy moons. But only moons with radii greater than about 2000 km are thought to be massive enough to melt pure water-ice in the outer layers. Tidal heating and the decay of rad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plate Tectonics On Europa
Plate may refer to: Cooking * Plate (dishware), broad, mainly flat vessel commonly used to serve food * Plates, tableware, dishes or dishware used for setting a table, serving food and dining * Plate, the content of such a plate (for example: rice plate) * Plate, to Food presentation, present food, on a plate * Plate, Cut of beef#Forequarter cuts, forequarter cut of beef Places * Plate, Germany, municipality in Parchim, Mecklenburg-Vorpommern, Germany * Plate, borough of Lüchow, Lower Saxony, Germany * River Plate (other) * Tourelle de la Plate, lighthouse in France Science and technology Biology and medicine * Plate (anatomy), several meanings * Dental plate, also known as dentures * Dynamic compression plate, metallic plate used in orthopedics to fix bone * Microtiter plate (or microplate or microwell plate), flat plate with multiple "wells" used as small test tubes * Orthopedic plate, internal fixation used in orthopaedic surgery * Petri dish or Petri plate, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umbriel
Umbriel () is the third-largest moon of Uranus. It was discovered on October 24, 1851, by William Lassell at the same time as neighboring moon Ariel. It was named after a character in Alexander Pope's 1712 poem '' The Rape of the Lock''. Umbriel consists mainly of ice with a substantial fraction of rock, and may be differentiated into a rocky core and an icy mantle. The surface is the darkest among Uranian moons, and appears to have been shaped primarily by impacts, but the presence of canyons suggests early internal processes, and the moon may have undergone an early endogenically driven resurfacing event that obliterated its older surface. Covered by numerous impact craters reaching in diameter, Umbriel is the second-most heavily cratered satellite of Uranus after Oberon. The most prominent surface feature is a ring of bright material on the floor of Wunda crater. This moon, like all regular moons of Uranus, probably formed from an accretion disk that surrounded the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plate Tectonics
Plate tectonics (, ) is the scientific theory that the Earth's lithosphere comprises a number of large tectonic plates, which have been slowly moving since 3–4 billion years ago. The model builds on the concept of , an idea developed during the first decades of the 20th century. Plate tectonics came to be accepted by Earth science, geoscientists after seafloor spreading was validated in the mid-to-late 1960s. The processes that result in plates and shape Earth's crust are called ''tectonics''. Tectonic plates also occur in other planets and moons. Earth's lithosphere, the rigid outer shell of the planet including the crust (geology), crust and upper mantle, is fractured into seven or eight major plates (depending on how they are defined) and many minor plates or "platelets". Where the plates meet, their relative motion determines the type of plate boundary (or fault (geology), fault): , , or . The relative movement of the plates typically ranges from zero to 10 cm annu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moons
A natural satellite is, in the most common usage, an astronomical body that orbits a planet, dwarf planet, or small Solar System body (or sometimes another natural satellite). Natural satellites are colloquially referred to as moons, a derivation from the Moon of Earth. In the Solar System, there are six planetary satellite systems containing 418 known natural satellites altogether. Seven objects commonly considered dwarf planets by astronomers are also known to have natural satellites: , Pluto, Haumea, , Makemake, , and Eris. As of January 2022, there are 447 other minor planets known to have natural satellites. A planet usually has at least around 10,000 times the mass of any natural satellites that orbit it, with a correspondingly much larger diameter. The Earth–Moon system is a unique exception in the Solar System; at 3,474 kilometres (2,158 miles) across, the Moon is 0.273 times the diameter of Earth and about of its mass. The next largest ratios are the Ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phaidra Linea
Phaedra may refer to: Mythology * Phaedra (mythology), Cretan princess, daughter of Minos and Pasiphaë, wife of Theseus Arts and entertainment * ''Phaedra'' (Cabanel), an 1880 painting by Alexandre Cabanel * House of Phaedra, house with erotic murals in Pompei Film * ''Phaedra'' (film), a 1962 film by Jules Dassin based on the Phaedra myth * Phaedra Cinema, a distributor of films in the US of the late 20th century Music * ''Phaedra'' (album) (1974), by the electronic music group Tangerine Dream ** '' Phaedra 2005'', a later album by Tangerine Dream * ''Phaedra'' (cantata), a cantata by Benjamin Britten based on the Phaedra myth * Phaedra, a mysterious woman referred to in the song "Some Velvet Morning" sung by Nancy Sinatra and Lee Hazlewood * ''Phaedra'' (opera), an opera by Hans Werner Henze based on the Phaedra myth * Phèdre (opera), an opera by Jean-Baptiste Lemoyne * Phaedra (Phèdre), a character in the opera ''Hippolytus and Aricia'' by Jean-Philippe Rameau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ridges And Fractures
A ridge is a long, narrow, elevated geomorphologic landform, structural feature, or a combination of both separated from the surrounding terrain by steep sides. The sides of a ridge slope away from a narrow top, the crest or ridgecrest, with the terrain dropping down on either side. The crest, if narrow, is also called a ridgeline. Limitations on the dimensions of a ridge are lacking. Its height above the surrounding terrain can vary from less than a meter to hundreds of meters. A ridge can be either depositional, erosional, tectonic, or a combination of these in origin and can consist of either bedrock, loose sediment, lava, or ice depending on its origin. A ridge can occur as either an isolated, independent feature or part of a larger geomorphological and/or structural feature. Frequently, a ridge can be further subdivided into smaller geomorphic or structural elements. Classification As in the case of landforms in general, there is a lack of any commonly agreed classi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transition To Chaos Terrain
Transition or transitional may refer to: Mathematics, science, and technology Biology * Transition (genetics), a point mutation that changes a purine nucleotide to another purine (A ↔ G) or a pyrimidine nucleotide to another pyrimidine (C ↔ T) * Transitional fossil, any fossilized remains of a lifeform that exhibits the characteristics of two distinct taxonomic groups * A phase during childbirth contractions during which the cervix completes its dilation Gender and sex * Gender transition, the process of changing one's gender presentation to accord with one's internal sense of one's gender – the idea of what it means to be a man or woman ** Gender-affirming care, the physical aspect of a gender transition ** Gender-affirming surgery, surgical intervention a part of medical gender affirmation Physics * Phase transition, a transformation of the state of matter; for example, the change between a solid and a liquid, between liquid and gas or between gas and plasma * Quantum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galileo Mission
''Galileo'' was an American robotic space program that studied the planet Jupiter and its moons, as well as several other Solar System bodies. Named after the Italian astronomer Galileo Galilei, the ''Galileo'' spacecraft consisted of an orbiter and an atmospheric entry probe. It was delivered into Earth orbit on October 18, 1989, by on the STS-34 mission, and arrived at Jupiter on December 7, 1995, after gravity assist flybys of Venus and Earth, and became the first spacecraft to orbit Jupiter. The spacecraft then launched the first probe to directly measure its atmosphere. Despite suffering major antenna problems, ''Galileo'' achieved the first asteroid flyby, of 951 Gaspra, and discovered the first asteroid moon, Dactyl, around 243 Ida. In 1994, ''Galileo'' observed Comet Shoemaker–Levy 9's collision with Jupiter. Jupiter's atmospheric composition and ammonia clouds were recorded, as were the volcanism and plasma interactions on Io with Jupiter's atmosphere. The dat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
