1.
United States Naval Research Laboratory
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A few of the laboratorys current specialties include plasma physics, space physics, materials science, and tactical electronic warfare. NRL is one of the first US Government scientific R&D laboratories, having opened in 1923 at the instigation of Thomas Edison, NRLs research expenditures are approximately $1.1 billion per year. The Naval Research Laboratory conducts a variety of basic and scientific research. It has a history of scientific breakthroughs and technological achievements dating back to its foundation in 1923. In many instances the contributions to military technology are declassified decades after those technologies have become widely adopted. In 2011, NRL researchers published 1,398 unclassified scientific & technical articles, book chapters, in 2008, the NRL was ranked #3 among all U. S. institutions holding nanotechnology-related patents, behind IBM and the University of California. The laboratory houses a range of R&D facilities. The most recent additions include the NRL Nanoscience Institutes 5000sqft Class 100 nanofabrication cleanroom and quiet measurement labs, the Naval Research Laboratory has been a crucial piece of the United States space program. Project Vanguard, the first American satellite program, tasked NRL with the design, construction and launch of an artificial satellite, Vanguard I, designed and built at NRL, was the first solar-powered satellite. As of 2013, Vanguard I is still in orbit, making it the longest-lived man-made satellite, Vanguard II was the first satellite to observe the Earths cloud cover and therefore the first meteorological satellite. NRL pioneered the study of the sun Ultraviolet and X-Ray spectrum, along with Project Vanguard, NRL also designed the first satellite tracking system, Minitrack, which became the prototype for future satellite tracking networks. NRLs recently declassified Galactic Radiation and Background I was the first U. S. intelligence satellite, NRLs spacecraft development program continues today with the TacSat-4 experimental tactical reconnaissance & communication satellite. In addition to design, NRL also designs and operates research instruments, such as the Large Angle and Spectrometric Coronagraph Experiment aboard the Solar. NASAs Gamma-ray Large Area Space Telescope was tested at NRL spacecraft testing facilities, NRL scientists have most recently contributed leading research to the study of novas and gamma ray bursts. Modern mechanical fracture mechanics were pioneered at NRL and were applied to solve fracture problems in Navy vessels, commercial aircraft. That knowledge is in use today in applications ranging from design of nuclear reactors to aircraft, submarines. NRLs GaAs inventions were licensed by Rockwell, Westinghouse, Texas Instruments, high-purity GaAs is also used for high-efficiency solar cells like those aboard NASAs Spirit and Opportunity rovers currently on Mars. Fundamental aspects of technology were developed at NRL, including the radar absorption mechanisms in ferrite-containing materials
2.
Cape Canaveral Air Force Station
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Cape Canaveral Air Force Station is an installation of the United States Air Force Space Commands 45th Space Wing, headquartered at nearby Patrick Air Force Base. Located on Cape Canaveral in Brevard County, Florida, CCAFS is the primary head of Americas Eastern Range with three launch pads currently active. The Cape Canaveral Air Force Station Skid Strip provides a 10, 000-foot runway close to the launch complexes for military airlift aircraft delivering heavy, a number of American space exploration firsts were launched from CCAFS, including the first U. S. Earth satellite, first U. S. astronaut, first U. S. astronaut in orbit, first two-man U. S. spacecraft, first U. S. unmanned lunar landing, and first three-man U. S. spacecraft. The CCAFS area had used by the United States government to test missiles since 1949. On June 1,1948, the U. S. Navy transferred the former Banana River Naval Air Station to the U. S. Air Force, with USAF renaming the facility the Joint Long Range Proving Ground Base on June 10,1949. On October 1,1949, the Joint Long Range Proving Ground Base was transferred from the Air Materiel Command to the Air Force Division of the Joint Long Range Proving Ground. On May 17,1950, the base was renamed the Long Range Proving Ground Base, in 1951, the Air Force established the Air Force Missile Test Center. Early American sub-orbital rocket flights were achieved at Cape Canaveral in 1956 and these flights occurred shortly after sub-orbital flights launched from White Sands Missile Range, such as the Viking 12 sounding rocket on February 4,1955. Following the Soviet Unions successful Sputnik 1, the US attempted its first launch of a satellite from Cape Canaveral on December 6,1957. However, the rocket carrying Vanguard TV3 blew up on the launch pad, NASA was founded in 1958, and Air Force crews launched missiles for NASA from the Cape, known then as Cape Canaveral Missile Annex. The row of Titan and Atlas launch pads along the coast came to be known as Missile Row in the 1960s, nASAs first manned spaceflight program was prepared for launch from Canaveral by U. S. Air Force crews. Mercurys objectives were to place a spacecraft in Earth orbit, investigate human performance and ability to function in space. Suborbital flights were launched by derivatives of the Armys Redstone missile from LC-5, Orbital flights were launched by derivatives of the Air Forces larger Atlas D missile from LC-14. The first American in orbit was John Glenn on February 20,1962, three more orbital flights followed through May 1963. Flight control for all Mercury missions was provided at the Mercury Control Center located at Canaveral near LC-14 and he had also convinced Gov. C. Farris Bryant to change the name of Cape Canaveral to Cape Kennedy and this resulted in some confusion in public perception, which conflated the two. This name was used through the Gemini and early Apollo programs, however, the geographical name change proved to be unpopular, owing to the historical longevity of Cape Canaveral
3.
Earth
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Earth, otherwise known as the World, or the Globe, is the third planet from the Sun and the only object in the Universe known to harbor life. It is the densest planet in the Solar System and the largest of the four terrestrial planets, according to radiometric dating and other sources of evidence, Earth formed about 4.54 billion years ago. Earths gravity interacts with objects in space, especially the Sun. During one orbit around the Sun, Earth rotates about its axis over 365 times, thus, Earths axis of rotation is tilted, producing seasonal variations on the planets surface. The gravitational interaction between the Earth and Moon causes ocean tides, stabilizes the Earths orientation on its axis, Earths lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years. About 71% of Earths surface is covered with water, mostly by its oceans, the remaining 29% is land consisting of continents and islands that together have many lakes, rivers and other sources of water that contribute to the hydrosphere. The majority of Earths polar regions are covered in ice, including the Antarctic ice sheet, Earths interior remains active with a solid iron inner core, a liquid outer core that generates the Earths magnetic field, and a convecting mantle that drives plate tectonics. Within the first billion years of Earths history, life appeared in the oceans and began to affect the Earths atmosphere and surface, some geological evidence indicates that life may have arisen as much as 4.1 billion years ago. Since then, the combination of Earths distance from the Sun, physical properties, in the history of the Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinction events. Over 99% of all species that lived on Earth are extinct. Estimates of the number of species on Earth today vary widely, over 7.4 billion humans live on Earth and depend on its biosphere and minerals for their survival. Humans have developed diverse societies and cultures, politically, the world has about 200 sovereign states, the modern English word Earth developed from a wide variety of Middle English forms, which derived from an Old English noun most often spelled eorðe. It has cognates in every Germanic language, and their proto-Germanic root has been reconstructed as *erþō, originally, earth was written in lowercase, and from early Middle English, its definite sense as the globe was expressed as the earth. By early Modern English, many nouns were capitalized, and the became the Earth. More recently, the name is simply given as Earth. House styles now vary, Oxford spelling recognizes the lowercase form as the most common, another convention capitalizes Earth when appearing as a name but writes it in lowercase when preceded by the. It almost always appears in lowercase in colloquial expressions such as what on earth are you doing, the oldest material found in the Solar System is dated to 4. 5672±0.0006 billion years ago. By 4. 54±0.04 Gya the primordial Earth had formed, the formation and evolution of Solar System bodies occurred along with the Sun
4.
Satellite
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In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit. Such objects are called artificial satellites to distinguish them from natural satellites such as Earths Moon. In 1957 the Soviet Union launched the worlds first artificial satellite, since then, about 6,600 satellites from more than 40 countries have been launched. According to a 2013 estimate,3,600 remained in orbit, of those, about 1,000 were operational, the rest have lived out their useful lives and become space debris. Approximately 500 operational satellites are in orbit,50 are in medium-Earth orbit. A few large satellites have been launched in parts and assembled in orbit. Over a dozen space probes have been placed into orbit around other bodies and become artificial satellites to the Moon, Mercury, Venus, Mars, Jupiter, Saturn, a few asteroids, Satellites are used for many purposes. Common types include military and civilian Earth observation satellites, communications satellites, navigation satellites, weather satellites, Space stations and human spacecraft in orbit are also satellites. Satellite orbits vary greatly, depending on the purpose of the satellite, well-known classes include low Earth orbit, polar orbit, and geostationary orbit. A launch vehicle is a rocket that throws a satellite into orbit, usually it lifts off from a launch pad on land. Some are launched at sea from a submarine or a mobile maritime platform, Satellites are usually semi-independent computer-controlled systems. Satellite subsystems attend many tasks, such as power generation, thermal control, telemetry, attitude control, the first fictional depiction of a satellite being launched into orbit was a short story by Edward Everett Hale, The Brick Moon. The idea surfaced again in Jules Vernes The Begums Fortune, in 1903, Konstantin Tsiolkovsky published Exploring Space Using Jet Propulsion Devices, which is the first academic treatise on the use of rocketry to launch spacecraft. He calculated the speed required for a minimal orbit. In 1928, Herman Potočnik published his book, The Problem of Space Travel — The Rocket Motor. He described the use of orbiting spacecraft for observation of the ground, in a 1945 Wireless World article, the English science fiction writer Arthur C. Clarke described in detail the possible use of communications satellites for mass communications. He suggested that three geostationary satellites would provide coverage over the entire planet, the first artificial satellite was Sputnik 1, launched by the Soviet Union on October 4,1957, and initiating the Soviet Sputnik program, with Sergei Korolev as chief designer. This in turn triggered the Space Race between the Soviet Union and the United States, Sputnik 1 helped to identify the density of high atmospheric layers through measurement of its orbital change and provided data on radio-signal distribution in the ionosphere
5.
Explorer 1
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Explorer 1 was the first satellite of the United States, launched as part of its participation in the International Geophysical Year. The mission followed the first two satellites the previous year, the Soviet Unions Sputnik 1 and 2, beginning the Cold War Space Race between the two nations. Explorer 1 was launched on January 31,1958 at 22,48 Eastern Time atop the first Juno booster from LC-26 at the Cape Canaveral Missile Annex, Florida. It was the first spacecraft to detect the Van Allen radiation belt and it remained in orbit until 1970, and has been followed by more than 90 scientific spacecraft in the Explorer series. Explorer 1 was given Satellite Catalog Number 4, and the Harvard designation 1958 Alpha 1, the forerunner to the modern International Designator. Earth satellite program began in 1954 as a joint U. S. Army and U. S. Navy proposal, called Project Orbiter, to put a scientific satellite into orbit during the International Geophysical Year. The proposal, using a military Redstone missile, was rejected in 1955 by the Eisenhower administration in favor of the Navys Project Vanguard, using a booster advertised as more civilian in nature. Following the launch of the Soviet satellite Sputnik 1 on October 4,1957, the Jupiter-C design used for the launch had already been flight-tested in nose cone reentry tests for the Jupiter IRBM, and was modified into Juno I. Working closely together, ABMA and JPL completed the job of modifying the Jupiter-C, however, before work was completed, the Soviet Union launched a second satellite, Sputnik 2, on November 3,1957. The U. S. Navys attempt to put the first U. S. satellite into orbit failed with the launch of the Vanguard TV3 on December 6,1957. Explorer 1 was designed and built by the California Institute of Technologys JPL under the direction of Dr. William H. Pickering and it was the second satellite to carry a mission payload. The total weight of the satellite was 13.37 kilograms, in comparison, the first Soviet satellite Sputnik 1 weighed 83.6 kg. The instrument section at the front end of the satellite and the empty scaled-down fourth-stage rocket casing orbited as a single unit, data from the scientific instruments was transmitted to the ground by two antennas. This was an early time frame in the development of transistor technology. A total of 29 transistors were used in Explorer 1, plus additional ones in the Armys micrometeorite amplifier, electrical power was provided by mercury chemical batteries that made up approximately 40 percent of the payload weight. The external skin of the instrument section was sandblasted stainless steel with white stripes, the final coloration was determined by studies of shadow–sunlight intervals based on firing time, trajectory, orbit, and inclination. The Explorer 1 payload consisted of the Iowa Cosmic Ray Instrument without a data recorder which was not modified in time to make it onto the spacecraft. The real-time data received on the ground was very sparse and puzzling showing normal counting rates
6.
Solar power
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Solar power is the conversion of energy from sunlight into electricity, either directly using photovoltaics, or indirectly using concentrated solar power. Concentrated solar power systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam, Photovoltaic cells convert light into an electric current using the photovoltaic effect. Most solar installations would be in China and India, Solar PV is rapidly becoming an inexpensive, low-carbon technology to harness renewable energy from the Sun. The current largest photovoltaic power station in the world is the 850 MW Longyangxia Dam Solar Park, in Qinghai, commercial concentrated solar power plants were first developed in the 1980s. The 392 MW Ivanpah installation is the largest concentrating solar power plant in the world, long distance transmission allows remote renewable energy resources to displace fossil fuel consumption. Solar power plants use one of two technologies, Photovoltaic systems use solar panels, either on rooftops or in ground-mounted solar farms, concentrated solar power plants use solar thermal energy to make steam, that is thereafter converted into electricity by a turbine. A solar cell, or photovoltaic cell, is a device that converts light into electric current using the photovoltaic effect, the first solar cell was constructed by Charles Fritts in the 1880s. The German industrialist Ernst Werner von Siemens was among those who recognized the importance of this discovery, following the work of Russell Ohl in the 1940s, researchers Gerald Pearson, Calvin Fuller and Daryl Chapin created the silicon solar cell in 1954. These early solar cells cost 286 USD/watt and reached efficiencies of 4. 5–6%, the array of a photovoltaic power system, or PV system, produces direct current power which fluctuates with the sunlights intensity. For practical use this usually requires conversion to certain desired voltages or alternating current, multiple solar cells are connected inside modules. Modules are wired together to form arrays, then tied to an inverter, which produces power at the voltage, and for AC. Many residential PV systems are connected to the grid wherever available, in these grid-connected PV systems, use of energy storage is optional. In certain applications such as satellites, lighthouses, or in developing countries, batteries or additional power generators are often added as back-ups, such stand-alone power systems permit operations at night and at other times of limited sunlight. Concentrated solar power, also called concentrated solar thermal, uses lenses or mirrors, contrary to photovoltaics – which converts light directly into electricity – CSP uses the heat of the suns radiation to generate electricity from conventional steam-driven turbines. A wide range of concentrating technologies exists, among the best known are the trough, the compact linear Fresnel reflector, the Stirling dish. Various techniques are used to track the sun and focus light, in all of these systems a working fluid is heated by the concentrated sunlight, and is then used for power generation or energy storage. Thermal storage efficiently allows up to 24-hour electricity generation, a parabolic trough consists of a linear parabolic reflector that concentrates light onto a receiver positioned along the reflectors focal line. The receiver is a tube positioned right above the middle of the mirror and is filled with a working fluid
7.
Premier of the Soviet Union
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The office of Premier of the Soviet Union was synonymous with head of government of the Union of Soviet Socialist Republics. Twelve individuals became premier over the span of the office. Two of the twelve died in office of natural causes. The first premier was Lenin, who was inaugurated in 1922 after the Treaty on the Creation of the USSR, ivan Silayev spent the shortest time in office at 126 days in 1991. At over fourteen years, Kosygin spent the longest time in office, the Council of Peoples Commissars was established on 8 November 1917 by the Russian Soviet Federative Socialist Republic Government. The Council of Peoples Commissars published decrees and decisions that were binding throughout the Soviet Union, in 1946, the Council of Peoples Commissars was transformed into the Council of Ministers at both all-Union and Union Republic level. However Kosygins position was weakened when he proposed a reform in 1965. Under the 1977 Soviet Constitution, the Chairman of the Council of Ministers was the head of government of the USSR. The premier was responsible and accountable to the Supreme Soviet, the premier managed the national economy, formulated the five-year plans and ensured socio-cultural development. List of heads of state of the Soviet Union List of leaders of the Soviet Union Deputy Premier of the Soviet Union First Deputy Premier of the Soviet Union
8.
Nikita Khrushchev
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Nikita Sergeyevich Khrushchev was a politician who led the Soviet Union during part of the Cold War. He served as First Secretary of the Communist Party of the Soviet Union from 1953 to 1964, Khrushchevs party colleagues removed him from power in 1964, replacing him with Leonid Brezhnev as First Secretary and Alexei Kosygin as Premier. Khrushchev was born in the village of Kalinovka in 1894, close to the border between Russia and Ukraine. He was employed as a metalworker in his youth, and during the Russian Civil War was a political commissar, with the help of Lazar Kaganovich, he worked his way up the Soviet hierarchy. He supported Joseph Stalins purges, and approved thousands of arrests, in 1938, Stalin sent him to govern Ukraine, and he continued the purges there. During what was known in the Soviet Union as the Great Patriotic War, Khrushchev was again a commissar, Khrushchev was present at the bloody defense of Stalingrad, a fact he took great pride in throughout his life. After the war, he returned to Ukraine before being recalled to Moscow as one of Stalins close advisers, in the power struggle triggered by Stalins death in 1953, Khrushchev, after several years, emerged victorious. On 25 February 1956, at the 20th Party Congress, he delivered the Secret Speech, denouncing Stalins purges and his domestic policies, aimed at bettering the lives of ordinary citizens, were often ineffective, especially in agriculture. Hoping eventually to rely on missiles for defense, Khrushchev ordered major cuts in conventional forces. Despite the cuts, Khrushchevs rule saw the most tense years of the Cold War, flaws in Khrushchevs policies eroded his popularity and emboldened potential opponents, who quietly rose in strength and deposed the premier in October 1964. However, he did not suffer the fate of previous losers of Soviet power struggles, and was pensioned off with an apartment in Moscow. His lengthy memoirs were smuggled to the West and published in part in 1970, Khrushchev died in 1971 of heart disease. Khrushchev was born on 15 April 1894, in Kalinovka, a village in what is now Russias Kursk Oblast and his parents, Sergei Khrushchev and Ksenia Khrushcheva, were poor peasants of Russian origin, and had a daughter two years Nikitas junior, Irina. Sergei Khrushchev was employed in a number of positions in the Donbas area of far eastern Ukraine, working as a railwayman, as a miner, and laboring in a brick factory. Wages were much higher in the Donbas than in the Kursk region, Kalinovka was a peasant village, Khrushchevs teacher, Lydia Shevchenko, later stated that she had never seen a village as poor as Kalinovka had been. Nikita worked as a herdsboy from an early age and he was schooled for a total of four years, part in the village parochial school and part under Shevchenkos tutelage in Kalinovkas state school. She urged Nikita to seek education, but family finances did not permit this. In 1908, Sergei Khrushchev moved to the Donbas city of Yuzovka, fourteen-year-old Nikita followed later that year, while Ksenia Khrushcheva and her daughter came after
9.
Aluminium
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Aluminium or aluminum is a chemical element in the boron group with symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic, ductile metal, Aluminium metal is so chemically reactive that native specimens are rare and limited to extreme reducing environments. Instead, it is combined in over 270 different minerals. The chief ore of aluminium is bauxite, Aluminium is remarkable for the metals low density and its ability to resist corrosion through the phenomenon of passivation. Aluminium and its alloys are vital to the industry and important in transportation and structures, such as building facades. The oxides and sulfates are the most useful compounds of aluminium, despite its prevalence in the environment, no known form of life uses aluminium salts metabolically, but aluminium is well tolerated by plants and animals. Because of these salts abundance, the potential for a role for them is of continuing interest. Aluminium is a soft, durable, lightweight, ductile. It is nonmagnetic and does not easily ignite, a fresh film of aluminium serves as a good reflector of visible light and an excellent reflector of medium and far infrared radiation. The yield strength of aluminium is 7–11 MPa, while aluminium alloys have yield strengths ranging from 200 MPa to 600 MPa. Aluminium has about one-third the density and stiffness of steel and it is easily machined, cast, drawn and extruded. Aluminium atoms are arranged in a cubic structure. Aluminium has an energy of approximately 200 mJ/m2. Aluminium is a thermal and electrical conductor, having 59% the conductivity of copper. Aluminium is capable of superconductivity, with a critical temperature of 1.2 kelvin. Aluminium is the most common material for the fabrication of superconducting qubits, the strongest aluminium alloys are less corrosion resistant due to galvanic reactions with alloyed copper. This corrosion resistance is reduced by aqueous salts, particularly in the presence of dissimilar metals. In highly acidic solutions, aluminium reacts with water to form hydrogen, primarily because it is corroded by dissolved chlorides, such as common sodium chloride, household plumbing is never made from aluminium
10.
National Air and Space Museum
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The National Air and Space Museum of the Smithsonian Institution, also called the NASM, is a museum in Washington, D. C. It holds the largest collection of aircraft and spacecraft in the world. It was established in 1946 as the National Air Museum and opened its building on the National Mall near LEnfant Plaza in 1976. In 2014, the museum saw approximately 6.7 million visitors, the museum contains the Apollo 11 module, the Friendship 7 capsule which was flown by John Glenn, the Bell X-1 which broke the sound barrier, and the Wright brothers plane near the entrance. The National Air and Space Museum is a center for research into the history and science of aviation and spaceflight, as well as science and terrestrial geology. Almost all space and aircraft on display are originals or the original backup craft and it operates an annex, the Steven F. Udvar-Hazy Center, at Dulles International Airport, which opened in 2003 and itself encompasses 760,000 square feet. The museum currently conducts restoration of its collection at the Paul E. St, the mass of the museum is similar to the National Gallery of Art across the National Mall, and uses the same pink Tennessee marble as the National Gallery. Built by Gilbane Building Company, the museum was completed in 1976, the west glass wall of the building is used for the installation of airplanes, functioning as a giant door. The Air and Space Museum was originally called the National Air Museum when formed on August 12,1946 by an act of Congress and signed into law by President Harry S. Truman. The String fellow steam engine intended for aircraft was added to the collection in 1889, some pieces were on display in the Arts and Industries Building, some were stored in the Aircraft Building, a large temporary metal shed in the Smithsonian Castles south yard. Larger missiles and rockets were displayed outdoors in what was known as Rocket Row, the shed housed a large Martin bomber, a LePere fighter-bomber, and an Aeromarine 39B floatplane. Still, much of the collection remained in storage due to a lack of display space, the current Garber Facility was ceded to the Smithsonian by the Maryland-National Capital Park and Planning Commission in 1952 after the curator Paul E. Garber spotted the wooded area from the air. Bulldozers from Fort Belvoir and prefabricated buildings from the United States Navy kept the initial costs low, the Steven F. Udvar-Hazy Center opened in 2003, funded by a private donation. The museum also holds the mirror for the Hubble which. The Smithsonian has also promised the International Cometary Explorer, which is currently in a solar orbit that occasionally brings it back to Earth. The Air and Space Museum announced a renovation of its main entrance hall. The renovation to the hall was funded by a $30 million donation from Boeing. The gift, which will be paid over seven years, is the largest corporate donation ever received by the Air, Boeing had previously given donations totaling $58 million
11.
Chantilly, Virginia
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Chantilly is a census-designated place in western Fairfax County, Virginia, United States. The population was 23,039 at the 2010 census, Chantilly is named after an early-19th-century mansion and farm, which in turn took the name of an 18th-century plantation that was located in Westmoreland County, Virginia. The name Chantilly originated in France with the Château de Chantilly, located in the Northern Virginia portion of the Washington metropolitan area, Chantilly sits approximately 25 miles west of Washington, D. C. via Interstate 66 and U. S. Route 50. It is located between Centreville to the south, Herndon and Reston to the north and northeast, respectively, Chantilly was home to a number of colonial plantations in the 1700s, including the Sully Plantation built by Richard Bland Lee I. Other plantations included George Richard Lee Turbervilles Leeton Grove, the John Hutchison Farm, Cornelia Lee Turberville Stuart, who was born at Leeton and was the daughter of George Richard Lee Turberville and Henrietta Lee, inherited a portion of Leeton in 1817 from her father. During the Civil War, federal troops destroyed by fire the Chantilly Plantation manor house, one building remains, a stone house across Route 50 from the Greenbriar Shopping Center. After the war, Cornelia Stuart, who had become deeply in debt, sold her 1, the advertisement for the sale referenced several tenements, one of which was the Stone House. The village grew during the 19th century, particularly following the construction of the Little River Turnpike to Winchester, during the American Civil War on September 1,1862, the Battle of Chantilly was fought nearby. Reaching the Little River Turnpike northwest of Centreville, Jackson turned southeastward toward Fairfax Court House to strike in rear of Popes army, during September 1, Pope, apprised of Jacksons movement, began to withdraw toward Fairfax Court House. Late in the day, Jackson clashed with Union forces under Brigadier General Isaac Stevens and Major General Philip Kearny near Ox Hill, during the ensuing battle, which was fought amid a raging storm, both Union generals Stevens and Kearny were killed. The fighting ended at dusk, and Popes army continued its withdrawal to Fairfax, although commercial and residential development now covers most of the Chantilly battlefield, a small county park preserves a 5-acre portion of the battle site. Chantilly is located in western Fairfax County at 38°53′39″N 77°25′52″W, to the southwest is Schneider Crossroads, not part of any census-designated area. The present center of Chantilly is located around the intersection of U. S. Route 50 and Virginia Route 28. According to the United States Census Bureau, the CDP has an area of 12.2 square miles, of which 12.0 square miles is land and 0.1 square miles. As of the census of 2010, there were 23,039 people,7,218 households, the population density was 1,916.7 people per square mile. There were 7,403 housing units at a density of 615. 9/sq mi. The racial makeup of the CDP was 57. 6% White,6. 5% African American,0. 3% Native American,25. 2% Asian,0. 1% Pacific Islander,6. 1% some other race, and 4. 3% from two or more races. Hispanic or Latino of any race were 15. 9% of the population,13. 0% of all households were made up of individuals, and 2. 4% were someone living alone who was 65 years of age or older
12.
Radiation pressure
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Radiation pressure is the pressure exerted upon any surface exposed to electromagnetic radiation. Radiation pressure implies an interaction between radiation and bodies of various types, including clouds of particles or gases. The interactions can be absorption, reflection, or some of both, bodies also emit radiation and thereby experience a resulting pressure. For example, had the effects of the radiation pressure on the spacecraft of the Viking program been ignored. This article addresses the macroscopic aspects of radiation pressure, detailed quantum mechanical aspects of interactions are addressed in specialized articles on the subject. The details of how photons of various wavelengths interact with atoms can be explored through links in the See also section, johannes Kepler put forward the concept of radiation pressure back in 1619 to explain the observation that a tail of a comet always points away from the Sun. The pressure is very feeble, but can be detected by allowing the radiation to fall upon a delicately poised vane of reflective metal in a Nichols radiometer, radiation pressure can be analyzed as interactions by either electromagnetic waves or particles. The waves and photons both have the property of momentum, which allows their interchangeability under classical conditions, according to Maxwells theory of electromagnetism, an electromagnetic wave carries momentum, which can be transferred to a reflecting or absorbing surface hit by the wave. The component of the normal to the surface creates the pressure on the surface. The component tangent to the surface does not contribute to the pressure, electromagnetic radiation is quantized in particles called photons, the particle aspect of its wave–particle duality. Photons are best explained by quantum mechanics, although photons are zero-rest mass particles, they have the properties of energy and momentum, and thus exhibit the property of mass as they travel at light speed. The momentum of a photon is given by, p = h λ where p is momentum, h is Plancks constant, λ is wavelength and this expression shows the wave–particle duality. E = p c is the relationship where E is the energy. Then p = E c The generation of radiation pressure results from the property of photons, specifically. The surface exerts a force on the photons in changing their momentum by Newtons Second Law, a reactive force is applied to the body by Newtons Third Law. The orientation of a reflector determines the component of normal to its surface. Each factor contributes a cosine function, reducing the pressure on the surface, bodies radiate thermal energy according to their temperature. The emissions are electromagnetic radiation, and therefore have the properties of energy, the energy leaving a body tends to reduce its temperature
