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Vallis Rheita
Vallis Rheita is a linear valley on the near side of the Moon. It is located in the southeastern quadrant, and is oriented radially to Mare Nectaris. This valley appears to share a common origin with the Vallis Snellius to the northeast, as both are oriented radially with Mare Nectaris. The center of the valley lies at selenographic coordinates , and it has a length of 445 km. At its maximum extent this valley has a width of about 30 km, but it narrows to 10 km at the southeastern extreme. It is the second longest such valley on the near side of the Moon, being exceeded only by Vallis Snellius. Vallis Rheita has been eroded by a series of impacts, and several notable craters lie along the length of this valley. Near the northwestern end is the crater Rheita, for which this formation was named. Further to the southeast is the crater Young, nearly centered across the valley. Next to Young is Young D, also lying across the valley but less distorted by the rift. Further southeast ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vallis Snellius + Vallis Rheita - LRO - DTM
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Vallis (plural Valles) is Latin for valley, vale; it may refer to the following : ;Places and jurisdictions on Earth * the Swiss canton Wallis * Vallis (see), an ancient city, former bishopric and Latin Catholic titular see in Africa Proconsularis * Vallis Vale in Somerset ;Astronomy * Vallis (planetary geology) * Vallis Alpes on the Moon * Vallis Rheita on the Moon * Vallis Snellius on the Moon * Valles Marineris on Mars See also * Valles (other) Valles may refer to: Places *Interandean Valles, a region that is home to most of the human population and agricultural production of the central Andes of Peru, Bolivia, and northwest Argentina *Vallès, a region in Catalonia, Spain, comprising th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moon
The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of Australia). The Moon is a planetary-mass object with a differentiated rocky body, making it a satellite planet under the geophysical definitions of the term and larger than all known dwarf planets of the Solar System. It lacks any significant atmosphere, hydrosphere, or magnetic field. Its surface gravity is about one-sixth of Earth's at , with Jupiter's moon Io being the only satellite in the Solar System known to have a higher surface gravity and density. The Moon orbits Earth at an average distance of , or about 30 times Earth's diameter. Its gravitational influence is the main driver of Earth's tides and very slowly lengthens Earth's day. The Moon's orbit around Earth has a sidereal period of 27.3 days. During each synodic period ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Circular Sector
A circular sector, also known as circle sector or disk sector (symbol: ⌔), is the portion of a disk (a closed region bounded by a circle) enclosed by two radii and an arc, where the smaller area is known as the ''minor sector'' and the larger being the ''major sector''. In the diagram, is the central angle, r the radius of the circle, and L is the arc length of the minor sector. The angle formed by connecting the endpoints of the arc to any point on the circumference that is not in the sector is equal to half the central angle. Types A sector with the central angle of 180° is called a '' half-disk'' and is bounded by a diameter and a semicircle. Sectors with other central angles are sometimes given special names, such as quadrants (90°), sextants (60°), and octants (45°), which come from the sector being one 4th, 6th or 8th part of a full circle, respectively. Confusingly, the arc of a quadrant (a circular arc) can also be termed a quadrant. Compass Traditionally wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mare Nectaris
Mare Nectaris (Latin ''nectaris'', the "Sea of Nectar") is a small lunar mare or sea (a volcanic lava plain noticeably darker than the rest of the Moon's surface) located south of Mare Tranquillitatis southwest of Mare Fecunditatis, on the near side of the moon. Montes Pyrenaeus borders the mare to the east and Sinus Asperitatis fuses to its northwestern edge. It is 84,000 square kilometers in size. Several large craters are situated at the borders of Mare Nectaris. The biggest one is lava-filled Fracastorius (124 km), which fuses with southern coast of the Sea. A prominent trio of 100-km craters Theophilus, Cyrillus and Catharina is located near northwestern coast. Other notable feature is a "ghost crater" Daguerre, almost entirely covered with lava, in the northern part of Mare Nectaris. Mare Nectaris is located in the central part of 860-km-diameter impact basin, which was formed 3.8–3.9 billion years ago. This event marks the beginning of Nectarian period of the lu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vallis Snellius
Vallis Snellius is a linear valley on the near side of the Moon. It is located in the rugged southeastern part of the visible surface, to the south of the Mare Fecunditatis. This feature is radial to the Mare Nectaris basin to the west-northwest, much like Vallis Rheita to the southwest, and the two likely share a common origin. The selenographic coordinates The selenographic coordinate system is used to refer to locations on the surface of Earth's moon. Any position on the lunar surface can be referenced by specifying two numerical values, which are comparable to the latitude and longitude of Earth. ... of this feature are , and it has a maximum length of , making it the longest named valley on the Moon. Although linear, this valley is irregular in shape and has been heavily worn by impact erosion, making it difficult to trace across the surface. The crater Snellius from which it is named, lies across the valley. The valley cuts through the southern half of the crater floor. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selenographic Coordinates
The selenographic coordinate system is used to refer to locations on the surface of Earth's moon. Any position on the lunar surface can be referenced by specifying two numerical values, which are comparable to the latitude and longitude of Earth. The longitude gives the position east or west of the Moon's prime meridian, which is the line passing from the lunar north pole through the point on the lunar surface directly facing Earth to the lunar south pole. (See also Earth's prime meridian.) This can be thought of as the midpoint of the visible Moon as seen from the Earth. The latitude gives the position north or south of the lunar equator. Both of these coordinates are given in degrees. Astronomers defined the fundamental location in the selenographic coordinate system by the small, bowl-shaped satellite crater ' Mösting A'. The coordinates of this crater are defined as: : Later, the coordinate system has become more precisely defined due to the Lunar Laser Ranging E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 craters typically have raised rims and floors that are lower in elevation than the surrounding terrain. Lunar impact craters range from microscopic craters on lunar rocks returned by the Apollo Program and small, simple, bowl-shaped depressions in the lunar regolith to large, complex, multi-ringed impact basins. Meteor Crater is a well-known example of a small impact crater on Earth. Impact craters are the dominant geographic features on many solid Solar System objects including the Moon, Mercury, Callisto, Ganymede and most small moons and asteroids. On other planets and moons that experience more active surface geological processes, such as Earth, Venus, Europa, Io and Titan, visible impact craters are less common because they become eroded ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rheita (crater)
Rheita is a lunar impact crater located in the southwestern sector of the Moon. It was named after Czech astronomer and optician Anton Maria Schyrleus of Rheita. It lies to the northeast of the crater Metius, and northwest of Young. The southwestern rim overlies the edge of Vallis Rheita, a long lunar valley stretching for over 200 kilometers on a line running northeast to southwest. At its widest the valley is 25 kilometers wide and a kilometer deep. The rim of Rheita remains well-defined with a sharp lip and a terrace Terrace may refer to: Landforms and construction * Fluvial terrace, a natural, flat surface that borders and lies above the floodplain of a stream or river * Terrace, a street suffix * Terrace, the portion of a lot between the public sidewalk an ...d inner wall. The rim overlaps a slightly smaller crater to the east, and has a pair of small impact craters in the northern wall. The crater floor is flat and it has a central peak. Satellite craters By convention ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Young (crater)
Young is a lunar impact crater that is located in the rugged southeast part of the Moon's near side. It lies to the east of the crater Metius, and southeast of Rheita. The long Vallis Rheita Vallis Rheita is a linear valley on the near side of the Moon. It is located in the southeastern quadrant, and is oriented radially to Mare Nectaris. This valley appears to share a common origin with the Vallis Snellius to the northeast, as both ... follows a line tangential to the southwest rim of Rheita, and cuts a wide trough through the southwest floor and outer rim of Young. The surviving part of the crater is a worn, eroded formation that has seen better times. The rim and inner wall can still be followed across the surface, but it is indented and notched by smaller impacts. The inner floor contains a pair of small, bowl-shaped craters designated Young A and Young B. To the south of Young, the valley is overlain by Young D, a somewhat less eroded feature than Young. The valley cont ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mallet (crater)
Mallet is a crater on the near side of the Moon. It is located next to the linear valley named Vallis Rheita, in the rugged southeastern quadrant. To the northwest along the same valley formation is the crater Young Young may refer to: * Offspring, the product of reproduction of a new organism produced by one or more parents * Youth, the time of life when one is young, often meaning the time between childhood and adulthood Music * The Young, an American roc .... This is an old formation with a worn and rounded outer rim. The satellite crater Mallet A lies across the southwest part of the interior floor, and encroaches along the southwestern inner wall. Mallet B is nearly attached to the exterior only a few kilometers from Mallet A. The Vallis Rheita passes across the northeastern part of the rim, forming a nearly linear face along the outer rim. The remaining interior floor is marked by a small craterlet near the northern inner wall. Satellite craters By convention these feat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reimarus (crater)
Reimarus is a lunar impact crater, located in the southeastern part of the Moon's near side. The eroded southeastern end of the long Vallis Rheita (Rheita valley) passes just to the west. To the northeast is the larger and heavily worn crater Vega Vega is the brightest star in the northern constellation of Lyra. It has the Bayer designation α Lyrae, which is Latinised to Alpha Lyrae and abbreviated Alpha Lyr or α Lyr. This star is relatively close at only from the Sun, an .... This is a heavily worn and eroded crater, with an outer rim that has been incised and battered by multiple lesser, later impacts, particularly in the western half. Several small craterlets lie along the rim edge and the inner walls, and the outer rise is generally uneven and rugged. On the southwest part of the interior floor is a small crater. The remainder of the floor is generally featureless and marked only by a few tiny craterlets. Satellite craters By convention these features are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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