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Prairie Meteorite Network
The Prairie Meteorite Network was a system of sixteen camera stations in Midwestern United States, run by the Smithsonian Astrophysical Observatory Meteorobs.org from 1964 to 1975. The network used surplus aerocameras with 6.3–12 inch focal length wide angle lenses that covered a format of 9 x 18 inches on aero roll film. During ten years of network activity only one was recorded, the |
Pisgah Astronomical Research Institute
Pisgah Astronomical Research Institute (PARI) (pronounced ''perry'') is a non-profit astronomical observatory located in the Pisgah National Forest near Balsam Grove, North Carolina. PARI operates multiple radio telescopes and optical telescopes for research and teaching purposes. The observatory is affiliated with the University of North Carolina system through the Pisgah Astronomical Research and Science Educational Center (PARSEC). History PARI is located at the site of the former Rosman Satellite Tracking Station, which was established by the National Aeronautics and Space Administration (NASA) in 1962. The site was part of the worldwide Spacecraft Tracking and Data Acquisition Network and an integral communications link for the manned space programs Project Gemini and Project Apollo. The facility was transferred to the National Security Agency (NSA) in 1981. Known as the Rosman Research Station, it was used as a signals intelligence gathering facility. The site was clos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meteorite
A meteorite is a solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the atmosphere to reach the surface of a planet or Natural satellite, moon. When the original object enters the atmosphere, various factors such as friction, pressure, and chemical interactions with the atmospheric gases cause it to heat up and radiate energy. It then becomes a meteor and forms a Meteoroid#Fireball, fireball, also known as a shooting star; astronomers call the brightest examples "Bolide#Astronomy, bolides". Once it settles on the larger body's surface, the meteor becomes a meteorite. Meteorites vary greatly in size. For geologists, a bolide is a meteorite large enough to create an impact crater. Meteorites that are recovered after being observed as they transit the atmosphere and Impact event, impact the Earth are called meteorite falls. All others are known as meteorite finds. Meteorites have traditiona ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Midwestern United States
The Midwestern United States, also referred to as the Midwest or the American Midwest, is one of four census regions of the United States Census Bureau (also known as "Region 2"). It occupies the northern central part of the United States. It was officially named the North Central Region by the Census Bureau until 1984. It is between the Northeastern United States and the Western United States, with Canada to the north and the Southern United States to the south. The Census Bureau's definition consists of 12 states in the north central United States: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin. The region generally lies on the broad Interior Plain between the states occupying the Appalachian Mountain range and the states occupying the Rocky Mountain range. Major rivers in the region include, from east to west, the Ohio River, the Upper Mississippi River, and the Missouri River. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smithsonian Astrophysical Observatory
The Smithsonian Astrophysical Observatory (SAO) is a research institute of the Smithsonian Institution, concentrating on astrophysical studies including galactic and extragalactic astronomy, cosmology, solar, earth and planetary sciences, theory and instrumentation, using observations at wavelengths from the highest energy gamma rays to the radio, along with gravitational waves. Established in Washington, D.C., in 1890, the SAO moved its headquarters in 1955 to Cambridge, Massachusetts, where its research is a collaboration with the Harvard College Observatory (HCO) and the Harvard University Department of Astronomy. In 1973, the Smithsonian and Harvard formalized the collaboration as the Center for Astrophysics , Harvard & Smithsonian (CfA) under a single Director. History Samuel Pierpont Langley, the third Secretary of the Smithsonian, founded the Smithsonian Astrophysical Observatory on the south yard of the Smithsonian Castle (on the U.S. National Mall) on March 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Focal Length
The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light. A system with a shorter focal length bends the rays more sharply, bringing them to a focus in a shorter distance or diverging them more quickly. For the special case of a thin lens in air, a positive focal length is the distance over which initially collimated (parallel) rays are brought to a focus, or alternatively a negative focal length indicates how far in front of the lens a point source must be located to form a collimated beam. For more general optical systems, the focal length has no intuitive meaning; it is simply the inverse of the system's optical power. In most photography and all telescopy, where the subject is essentially infinitely far away, longer focal length (lower opti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metrogon
Metrogon is a high resolution, low-distortion, extra-wide field (90 degree field of view) photographic lens design, popularized by Bausch and Lomb. Variations of this design are said to have been used extensively by the US military for use in aerial photography on the T-11 camera. The most common Metrogon lenses have a f number of 6.3 and a focal length of 6 inches. The company name Bausch and Lomb and the US Patent number 2031792 are prominently inscribed on the front of the lens barrel. However, the said US Patent is of a 4 element lens that belongs to one inventor named Robert Richter of Carl Zeiss AG, filed in 1934. For this reason, it is said that the Metrogon is a US version of the popular and very similar (if not identical) Topogon Topogon is a wide field (originally 100 degrees field of view), symmetrical photographic lens designed by Robert Richter in 1933 for Zeiss Carl FA. Lenses produced under the name Metrogon also cite the US patent of the Topogon design. The initial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meteorite Fall
A meteorite fall, also called an observed fall, is a meteorite collected after its fall from outer space was observed by people or automated devices. Any other meteorite is called a "find". There are more than 1,100 documented falls listed in widely used databases, most of which have specimens in modern collections. , the Meteoritical Bulletin Database had 1211 confirmed falls. Importance Observed meteorite falls are important for several reasons. Material from observed falls has not been subjected to terrestrial weathering, making the find a better candidate for scientific study. Historically, observed falls were the most compelling evidence supporting the extraterrestrial origin of meteorites. Furthermore, observed fall discoveries are a better representative sample of the types of meteorites which fall to Earth. For example, iron meteorites take much longer to weather and are easier to identify as unusual objects, as compared to other types. This may explain the increas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lost City Meteorite
Lost City is an unincorporated community and census-designated place (CDP) in Cherokee County, Oklahoma, United States. The population was 770 at the 2010 census, a 4.8 percent decline from the figure of 809 recorded in 2000. It was the site of the first meteorite fall in the US to be recorded by a camera network. Geography Lost City is located north of State Highway 51 and northwest of the city of Tahlequah in northeast Oklahoma. The city is part of "Green Country", a region of the state characterized by green vegetation and numerous lakes, including Fort Gibson Lake, which lies west of Lost City. Lost City's geographic coordinates are (35.985954, -95.123886). According to the United States Census Bureau, the CDP has a total area of , all land. Demographics As of the census of 2000, there were 809 people, 279 households, and 234 families residing in the CDP. The population density was . There were 308 housing units at an average density of 13.2/sq mi (5.1/km2). The racia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glossary Of Meteoritics
This is a glossary of terms used in meteoritics, the science of meteorites. # * 2 Pallas – an asteroid from the asteroid belt and one of the likely parent bodies of the CR meteorites. * 4 Vesta – second-largest asteroid in the asteroid belt and likely source of the HED meteorites. * 221 Eos – an asteroid from the asteroid belt and one of the likely parent bodies of the CO meteorites. * 289 Nenetta – an asteroid from the asteroid belt and one of the likely parent bodies of the angrites. * 3103 Eger – an asteroid from the asteroid belt and one of the likely parent bodies of the aubrites. * 3819 Robinson – an asteroid from the asteroid belt and one of the likely parent bodies of the angrites. * IA meteorite – an iron meteorite group now part of the IAB group/complex. * IAB meteorite – an iron meteorite and primitive achondrite of the IAB group/complex. * IB meteorite – an iron meteorite group now part of the IAB group/complex. * IC meteorite – an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
European Fireball Network
European Fireball Network is an international organization based in Central Europe (Germany and Czech Republic). Its purpose is systematic and simultaneous night observation of meteors and other nebular objects. Description The network was initially located at the Ondřejov Observatory, Czech Republic, after the fall of the Příbram meteorite on 7 April 1959, which was the first meteorite simultaneously observed by several stations. By 1963, the network consisted of five stations. It was later (about 1968) expanded by the installation of about 15 new stations in Germany and named the European Fireball Network. The network currently consists of at least 34 camera stations located in Germany, Czech Republic, Belgium, Luxembourg, Switzerland, Slovakia and Austria at elevations up to 1846 m above mean sea level. The cameras are separated by a distance of about ; they cover an area of about and photograph the entire visible sky. Cameras at Czech stations are equipped with fisheye ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meteorite Organizations
A meteorite is a solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the atmosphere to reach the surface of a planet or moon. When the original object enters the atmosphere, various factors such as friction, pressure, and chemical interactions with the atmospheric gases cause it to heat up and radiate energy. It then becomes a meteor and forms a fireball, also known as a shooting star; astronomers call the brightest examples " bolides". Once it settles on the larger body's surface, the meteor becomes a meteorite. Meteorites vary greatly in size. For geologists, a bolide is a meteorite large enough to create an impact crater. Meteorites that are recovered after being observed as they transit the atmosphere and impact the Earth are called meteorite falls. All others are known as meteorite finds. Meteorites have traditionally been divided into three broad categories: stony meteorites that a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of Science And Technology In The United States
Science and technology in the United States has a long history, producing many important figures and developments in the field. The United States of America came into being around the Age of Enlightenment (1685 to 1815), an era in Western philosophy in which writers and thinkers, rejecting the perceived superstitions of the past, instead chose to emphasize the intellectual, scientific and cultural life, centered upon the 18th century, in which reason was advocated as the primary source for legitimacy and authority. Enlightenment philosophers envisioned a "republic of science," where ideas would be exchanged freely and useful knowledge would improve the lot of all citizens. The United States Constitution itself reflects the desire to encourage scientific creativity. It gives the United States Congress the power "to promote the progress of science and useful arts, by securing for limited times to authors and inventors the exclusive right to their respective writings and discove ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
