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Vertregt (crater)
Vertregt is the ancient remnant of a large lunar impact crater. It is located on the far side of the 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 ..., to the north of the unusual walled plain Van de Graaff. The prominent crater Aitken lies across the northeast rim of Vertregt, and Zwicky is attached to the northwestern rim. Vertregt has been heavily eroded and reshaped by subsequent events, leaving only a few segments of the outer rim still visible. The northwestern section of the rim is the most intact portion, although even this arcing ridge is marked by small craterlets. The interior consists of rugged ridges and smaller impacts, most prominently the crater pair of Vertregt L and Vertregt K in the southeast. There is a wide rift leading from the southern end of the cra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lunar Orbiter 2
The 1966 Lunar Orbiter 2 robotic spacecraft mission, part of the Lunar Orbiter Program, was designed primarily to photograph smooth areas of the lunar surface for selection and verification of safe landing sites for the Surveyor and Apollo missions. It was also equipped to collect selenodetic, radiation intensity, and micrometeoroid impact data. Mission Summary The spacecraft was placed in a cislunar trajectory and injected into an elliptical near-equatorial lunar orbit for data acquisition after 92.6 hours' flight time. The initial orbit was at an inclination of 11.8 degrees. The perilune was lowered to five days later after 33 orbits. A failure of the amplifier on the final day of readout, December 7, resulted in the loss of six photographs. On December 8, 1966 the inclination was altered to 17.5 degrees to provide new data on lunar gravity. The spacecraft acquired photographic data from November 18 to 25, 1966, and readout occurred through December 7, 1966. A total of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marinus Vertregt
Marinus Vertregt (April 19, 1897 – May 1, 1973) was a Dutch astronomer. Early life Vertregt was born in Dordrecht, Netherlands. After elementary school he attended the Higher Technical school there and took a course in sugar technology. In 1917 he departed for the Dutch East Indies (now called Indonesia) and was employed at several sugar factories of the Handels Vereeniging Amsterdam (H.V.A.) as a chemist, becoming a head chemist after three years. Afterwards he was employed in the plantations of the same company’s factories and became a director of the sugar estate of Minggiran in Java in 1935. In 1923 he married Hillegonda Hendrika van Donkelaar and in 1928 their daughter Angenita was born. In 1943, during the Second World War, Vertregt, his wife and his daughter were put in a Japanese internment camp, until their liberation in 1945. During this time he was separated from his family as Japanese camps were segregated between men and women. In 1947 he returned to Indone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vertregt Crater AS17-M-1386
Marinus Vertregt (April 19, 1897 – May 1, 1973) was a Dutch astronomer. Early life Vertregt was born in Dordrecht, Netherlands. After elementary school he attended the Higher Technical school there and took a course in sugar technology. In 1917 he departed for the Dutch East Indies (now called Indonesia) and was employed at several sugar factories of the Handels Vereeniging Amsterdam (H.V.A.) as a chemist, becoming a head chemist after three years. Afterwards he was employed in the plantations of the same company’s factories and became a director of the sugar estate of Minggiran in Java in 1935. In 1923 he married Hillegonda Hendrika van Donkelaar and in 1928 their daughter Angenita was born. In 1943, during the Second World War, Vertregt, his wife and his daughter were put in a Japanese internment camp, until their liberation in 1945. During this time he was separated from his family as Japanese camps were segregated between men and women. In 1947 he returned to Indone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lunar Craters
Lunar craters are impact craters on Earth's Moon. The Moon's surface has many craters, all of which were formed by impacts. The International Astronomical Union currently recognizes 9,137 craters, of which 1,675 have been dated. History The word ''crater'' was adopted from the Greek word for "vessel" (, a Greek vessel used to mix wine and water). Galileo built his first telescope in late 1609, and turned it to the Moon for the first time on November 30, 1609. He discovered that, contrary to general opinion at that time, the Moon was not a perfect sphere, but had both mountains and cup-like depressions. These were named craters by Johann Hieronymus Schröter (1791), extending its previous use with volcanoes. Robert Hooke in ''Micrographia'' (1665) proposed two hypotheses for lunar crater formation: one, that the craters were caused by projectile bombardment from space, the other, that they were the products of subterranean lunar volcanism. Scientific opinion as to the origin ... [...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] |
Far Side (Moon)
The far side of the Moon is the lunar hemisphere that always faces away from Earth, opposite to the near side, because of synchronous rotation in the Moon's orbit. Compared to the near side, the far side's terrain is rugged, with a multitude of impact craters and relatively few flat and dark lunar maria ("seas"), giving it an appearance closer to other barren places in the Solar System such as Mercury and Callisto. It has one of the largest craters in the Solar System, the South Pole–Aitken basin. The hemisphere is sometimes called the "dark side of the Moon", where "dark" means "unknown" instead of "lacking sunlight" each side of the Moon experiences two weeks of sunlight while the opposite side experiences two weeks of night. About 18 percent of the far side is occasionally visible from Earth due to libration. The remaining 82 percent remained unobserved until 1959, when it was photographed by the Soviet Luna 3 space probe. The Soviet Academy of Sciences published the ... [...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] |
Van De Graaff (crater)
Van de Graaff is a crater formation located on the far side of the Moon, on the northeast edge of Mare Ingenii. The crater is named for physicist Robert J. Van de Graaff, whose groundbreaking work includes the invention of the Van de Graaff generator. Description Van de Graaff has the appearance of two merged craters, approximately in a figure-8 shape with no intervening rim separating the two halves. The crater Birkeland is attached to the southeast rim, nestling against the slightly narrower "waist" of the formation. To the north is Aitken, and Nassau lies to the east. The outer rim has some terracing along the southwest wall, but is generally in a worn and eroded state. A pair of craterlets overlay the southeast rim, next to Birkeland. There are also several small craters on the interior floor of Van de Graaff. The southwest section has a central peak, while the northeast floor is slightly smoother in form. Orbital studies of the Moon have demonstrated that there is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aitken (crater)
Aitken is a large lunar crater, lunar impact crater that lies on the Far side (Moon), far side of the Moon, named for Robert Grant Aitken, an American astronomer specializing in binary stellar systems. It is located to the southeast of the crater Heaviside (lunar crater), Heaviside, and north of the unusual formation Van de Graaff (crater), Van de Graaff. Attached to the southwest rim is Vertregt (crater), Vertregt. To the southeast is the smaller Bergstrand (crater), Bergstrand. The inner wall of Aitken is Wiktionary: terrace, terraced and varies notably in width with the narrowest portion in the southwest. The crater Aitken Z lies across the inner north wall. Just to the north of the rim is the small crater Aitken which is surrounded by an ejecta blanket of lighter-albedo material. The interior floor has been resurfaced in the past by a darker lava flow, especially in the southern half. There are also several small crater impacts on the eastern floor, an arcing central ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zwicky (crater)
Zwicky is a lunar impact crater that is located on the far side of the Moon. It lies to the west of the crater Aitken, and is attached to the western rim of Vertregt. Attached to the northern end of Zwicky is Heaviside. Zwicky is a considerably eroded formation with an irregular rim and interior. Portions of the southern rim still survive, but the remainder has been almost completely eradicated. The satellite crater Zwicky N, located in the midst of the interior of Zwicky, has a relatively dark floor by comparison with the surrounding terrain. This smaller crater has a polygonal outline with relatively smooth inner walls. The interior floor is a lower albedo material that has a cracked surface. It is thought that this is caused by the cooling of molten material, or possibly tectonic movement. This is referred to informally as a "turtleback crater floor". The crater is named after astronomer Fritz Zwicky (1898–1974), a professor at Caltech, Pasadena and pioneer in the study of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NASA
The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeeding the National Advisory Committee for Aeronautics (NACA), to give the U.S. space development effort a distinctly civilian orientation, emphasizing peaceful applications in space science. NASA has since led most American space exploration, including Project Mercury, Project Gemini, the 1968-1972 Apollo Moon landing missions, the Skylab space station, and the Space Shuttle. NASA supports the International Space Station and oversees the development of the Orion spacecraft and the Space Launch System for the crewed lunar Artemis program, Commercial Crew spacecraft, and the planned Lunar Gateway space station. The agency is also responsible for the Launch Services Program, which provides oversight of launch operations and countdown management f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Geological Survey
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 hundredt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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